View previous topic :: View next topic |
Author |
Message |
Jesito
Joined: 24 Aug 2007 Posts: 5745 Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
Posted: Sun Oct 28, 2007 10:09 pm Post subject: Focusing screen, not fine tuned |
|
|
Jesito wrote:
After more than one month of experience, I'm still thinking my focusing screen does need a finer tuning.
Today I've been shooting my dughter whilst she was playing the clarinet. I tried to focus the instrument, but I'm afraid I've got some back focus and what really got focused was the fabric behind.
This is the picture 100%:
Your opinions will be very welcome, as usual...
Best regards,
Jes. _________________ Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
Back to top |
|
|
Flor27
Joined: 13 Sep 2007 Posts: 1195 Location: Paris, France
|
Posted: Sun Oct 28, 2007 10:19 pm Post subject: |
|
|
Flor27 wrote:
Sorry to ear that.
But prior to any opinion based on rome real pictures, a kind of laboratory test should be done :
http://photo.net/learn/focustest/
There is also a well know problem with 350D: mis-trimed mirror :
http://www.bord-studio.com/article_01eng.php
What I may suggest is to re-fit the original focusing screen, check if the mirror is adjusted, then check with the new screen it this one needs adjustment. _________________ Switching from M42 to Minolta MD & Contax/Yashica |
|
Back to top |
|
|
Flor27
Joined: 13 Sep 2007 Posts: 1195 Location: Paris, France
|
Posted: Sun Oct 28, 2007 10:27 pm Post subject: |
|
|
Flor27 wrote:
Not noticed in the last article, but you need an imperial system 0.05" hex-key, available here for cheap for all of us in metric system countries :
http://www.dealextreme.com/details.dx/sku.5418 _________________ Switching from M42 to Minolta MD & Contax/Yashica |
|
Back to top |
|
|
Jesito
Joined: 24 Aug 2007 Posts: 5745 Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
Posted: Sun Oct 28, 2007 10:29 pm Post subject: |
|
|
Jesito wrote:
Flor27 wrote: |
Sorry to ear that.
But prior to any opinion based on rome real pictures, a kind of laboratory test should be done :
http://photo.net/learn/focustest/
There is also a well know problem with 350D: mis-trimed mirror :
http://www.bord-studio.com/article_01eng.php
What I may suggest is to re-fit the original focusing screen, check if the mirror is adjusted, then check with the new screen it this one needs adjustment. |
Thanks for this focus test article. I didn't mention I'm using a Virtual Village split focus screen replacement, and I got some (a lot of) troubles trying to adust it properly... Peter was so kind of driving me through the dark waters of focusing screen replacement and adjust, but I'm afraid it's still not perfect.
This shot was taken with the czj planar 50mm 1.7 (my sharpest lens) and I expected a better sharpness. On the instrument there are many artifacts, so I'm thinking the focusing screen is not well adjusted...
I don't suspect on the mirror, I didn't touch it and by putting back the Canon focus screen, everything seems ok (more difficult to focus).
I'll read the article and plan a new benchtest...
Best regards,
Jes. _________________ Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
Back to top |
|
|
Jesito
Joined: 24 Aug 2007 Posts: 5745 Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
Posted: Sun Oct 28, 2007 10:33 pm Post subject: |
|
|
Jesito wrote:
Hi Flor, thanks!. I think I got a similar one, blue plastic instead...
Best regards,
Jes. _________________ Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
Back to top |
|
|
Jesito
Joined: 24 Aug 2007 Posts: 5745 Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
Posted: Sun Oct 28, 2007 10:45 pm Post subject: |
|
|
Jesito wrote:
BTW what about your Cosinon 28mm 2.8?. Have you had the opportunity of trying it?.
Best regards,
Jes. _________________ Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
Back to top |
|
|
Flor27
Joined: 13 Sep 2007 Posts: 1195 Location: Paris, France
|
Posted: Sun Oct 28, 2007 11:30 pm Post subject: |
|
|
Flor27 wrote:
About the Cosina, I made this shot, but no more showable actually :
http://forum.mflenses.com/viewtopic.php?p=22919#22919
I have also the Virtual Village focusing screen, but as all precision product, it may have a tiny adjustement difference between batch jobs (all the screen are re-worked on CNC machines from original SLR ones).
I have also read that , depending on the lens, AF doesn't make the focus the same way, so, on pro (d)SLR bodies, you can adjust lens by lens the film plan register distance... not difficult to understand why on a 350D you could have misfocus then ! _________________ Switching from M42 to Minolta MD & Contax/Yashica |
|
Back to top |
|
|
poilu
Joined: 26 Aug 2007 Posts: 10472 Location: Greece
Expire: 2019-08-29
|
Posted: Mon Oct 29, 2007 9:41 am Post subject: |
|
|
poilu wrote:
Happy birthday Jes
Mine is also backfocus a little and I also miss some shot.
I don't think we can have total precision by using tape or paper. Better to use what we have and wait for better days. I still don't know if katzeye is a solution.
p.s. Tell me for the clarinet shot, how many glass of champagne have you drink. You have to know that each glass is 2 more mm of backfocus _________________ T* |
|
Back to top |
|
|
Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
|
Posted: Mon Oct 29, 2007 3:12 pm Post subject: |
|
|
Farside wrote:
Flor27 wrote: |
About the Cosina, I made this shot, but no more showable actually :
http://forum.mflenses.com/viewtopic.php?p=22919#22919
I have also the Virtual Village focusing screen, but as all precision product, it may have a tiny adjustement difference between batch jobs (all the screen are re-worked on CNC machines from original SLR ones).
I have also read that , depending on the lens, AF doesn't make the focus the same way, so, on pro (d)SLR bodies, you can adjust lens by lens the film plan register distance... not difficult to understand why on a 350D you could have misfocus then ! |
I've found that on mine (10D) the focus isn't consistent as lens focal length changes. Only a couple of mm at a time, but it's slightly annoying on macro shots. The wider the lens, the more slightly front-focused it gets.
I must do a proper series of tests with it and see exactly where the problem lies, but I've a feeling it's probably now as good as it's going to get.
I've reached a compromise position with it and it suits most of the lenses most of the time.
Part of the problem, of course, is the pixel-peeping I can do now where before slight focus errors would have passed largely unnoticed if all I was doing was printing out 6x4s or shooting at smaller apertures where the error would have been hidden. Of course, it simply might have been my previous film cameras were better made _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
|
Back to top |
|
|
Jesito
Joined: 24 Aug 2007 Posts: 5745 Location: Olivella, Catalonia, (Spain)
Expire: 2015-01-07
|
Posted: Mon Oct 29, 2007 4:11 pm Post subject: |
|
|
Jesito wrote:
poilu wrote: |
Happy birthday Jes....
p.s. Tell me for the clarinet shot, how many glass of champagne have you drink. You have to know that each glass is 2 more mm of backfocus |
I've got a couple of meters of backfocusing then....
Thanks!.
Best regards,
Jes. _________________ Jesito, Moderator
Jesito's backsack:
Zooms Sigma 70-300, Tamron 35-135 and 70-210 short, 70-210 long, 28-70 CF Macro, 35-70, 35-80, Vivitar 70-210 KA, Tamron 70-250.
Fixed Industar-50, , Tamron 24mm, Tamron 135mm, Sands Hunter 135mm, Pancolar 50mm, Volna-3, many Exakta lenses
DSLR SIGMA SD9 & SD14, EOS 5D, Sony A700 and NEXF3, Oly E-330, E-400, E-450, E-1
TLR/6x6/645 YashicaMat, Petri 6x45, Nettar, Franka Solida, Brilliant
SLR Minolta X300, Fuji STX II, Praktica VLC3, Pentax P30t, EXA500, EXA 1A, Spotmatic(2), Chinon CM-4S, Ricoh, Contax, Konica TC-X , Minolta 5000, 7000i, 3Sxi, EOS 500 and CX
Rangefinders Chinon 35EE, Konica C35 auto, Canonet 28, Yashica Lynx, FED-2, Yashica electro 35, Argus C3 & C4, Regula Cita III, Voigtlander Vitoret (many), Welta Welti-I, Kodak Signette 35, Zorki-4, Bessa-R & L, Minolta Weathermatic, olympus XA2
Compact Film Konica C35V, Voigtlander Vitorets, Canon Prima Super 105, Olympus XA2 and XA3
Compact Digital Olympus C-5050, Aiptek Slim 3000, Canon Powershot A540, Nikon 5200, SIGMA DP1s, Polaroid X530, IXUS55, Kodak 6490, Powershot G9 and G10
CSCCanon EOS-M, Samsung NX100 and NX210, Lumix G5, NEX-F3 |
|
Back to top |
|
|
Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
|
Posted: Thu Jan 17, 2008 6:10 pm Post subject: |
|
|
Farside wrote:
I've finally given up with the VV screen and re-fitted the original standard Canon screen. Funny thing is, after all the hassle with the VV screen it's actually a relief to use the uncluttered bog-standard screen again. With all the taking out and putting back in, the little securing bracket was getting a bit fragile, so I think I'll be leaving it untouched from now on. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
|
Back to top |
|
|
LucisPictor
Joined: 26 Feb 2007 Posts: 17633 Location: Oberhessen, Germany / Maidstone ('95-'96)
Expire: 2013-12-03
|
Posted: Thu Jan 17, 2008 6:33 pm Post subject: |
|
|
LucisPictor wrote:
Farside wrote: |
I've finally given up with the VV screen and re-fitted the original standard Canon screen. Funny thing is, after all the hassle with the VV screen it's actually a relief to use the uncluttered bog-standard screen again. With all the taking out and putting back in, the little securing bracket was getting a bit fragile, so I think I'll be leaving it untouched from now on. |
That's why I have never tried it. You also could say that I am not brave enough. _________________ Personal forum activity on pause every now and again (due to job obligations)!
Carsten, former Moderator
Things ON SALE
Carsten = "KAPCTEH" = "Karusutenu" | T-shirt?.........................My photos from Emilia: http://www.schouler.net/emilia/emilia2011.html
My gear: http://retrocameracs.wordpress.com/ausrustung/
Old list: http://forum.mflenses.com/viewtopic.php?t=65 (Not up-to-date, sorry!) | http://www.lucispictor.de | http://www.alensaweek.wordpress.com |
http://www.retrocamera.de |
|
Back to top |
|
|
peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
|
Posted: Mon Feb 25, 2008 5:11 pm Post subject: |
|
|
peterqd wrote:
Farside wrote: |
I've finally given up with the VV screen and re-fitted the original standard Canon screen. |
Dave, could you update me on this. Were the problems solved when you replaced the original screen? Cheers _________________ Peter - Moderator |
|
Back to top |
|
|
Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
|
Posted: Tue Feb 26, 2008 12:47 am Post subject: |
|
|
Farside wrote:
peterqd wrote: |
Farside wrote: |
I've finally given up with the VV screen and re-fitted the original standard Canon screen. |
Dave, could you update me on this. Were the problems solved when you replaced the original screen? Cheers |
It's ok, but sometimes it's a little imprecise with wider angles. Overall it's better than the VV experience and I don't know that I'd be bothered trying another third party screen, especially now I've got the first of my focus-confirm adapters. Even if the VV screen had been spot-on, it was still annoyingly dark in the middle a lot of the time and just hindered more than helped. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
|
Back to top |
|
|
Flor27
Joined: 13 Sep 2007 Posts: 1195 Location: Paris, France
|
Posted: Tue Feb 26, 2008 1:23 am Post subject: |
|
|
Flor27 wrote:
I've also noticed that some lenses are prone to cheat the AF sensors and do front or back focus all the times. It's clearly visible with the SMC Takumar 50/1.4. I've tested 2 samples on the 5D with the same behavior. Indeed, focus was just fine with the Ee-s focus screen. _________________ Switching from M42 to Minolta MD & Contax/Yashica |
|
Back to top |
|
|
Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
|
Posted: Wed Feb 27, 2008 1:17 am Post subject: |
|
|
Farside wrote:
Flor, do you mean the screen was telling the truth and the FC was lying?
There's definitely a focus issue with some of my lenses, even if the standard screen is back in place - I must work my way through them and try to put some figures on it. At the moment the FC on the Tamrons seem to agree with the screen, I'll be interested to see what a FC M42 adapter shows, when I get one. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
|
Back to top |
|
|
Orio
Joined: 24 Feb 2007 Posts: 29545 Location: West Emilia
Expire: 2012-12-04
|
Posted: Wed Feb 27, 2008 1:30 am Post subject: |
|
|
Orio wrote:
The focus confirmation does not give a precise point, rather a range that is comprised between two trigger points.
It was suggested by someone that for each lens and adapter you have, you need to make tests to find out if you get better focusing by approaching the focus confirmation threshold rotating LtoR or RtoL
As for screen, you need to find out that your sight settings are correct. Cameras like EOS have this weak point, that the dioptric correction wheel can be easily misplaced by having the camera rub against your bag or pocket.
Once you are sure your sight setting is correct, if you have enough light through the lens to ensure a proper reading of the scene, the screen should never lie, unless your focusing screen was mounted in an incorrect way that is not respecting the correct distance, but this event is quite unlikely unless you messed around with the default position. _________________ Orio, Administrator
T*
NE CEDE MALIS AUDENTIOR ITO
Ferrania film is reborn! http://www.filmferrania.it/
Support the Ornano film chemicals company and help them survive!
http://forum.mflenses.com/ornano-chemical-products-t55525.html |
|
Back to top |
|
|
Stan
Joined: 14 Aug 2008 Posts: 34 Location: Seattle, WA, USA
|
Posted: Tue Aug 19, 2008 7:10 am Post subject: |
|
|
Stan wrote:
The dioptric correction has nothing to do with the image _already_formed_ on the viewfinder ground glass. It just lets or does not let you view it sharp.
If the picture is sharp in the viewfinder, but the shot is not sharp, or the sharpness in the viewfinder is not consistent with camera AF results - it is definitely focusing screen alignment problem in the camera. Can be solved by adding/removing shims under focusing screen. _________________ Canon 400D
Canon FD 50/1.8 S.C.(converted to M42)
Auto-Topcor 35/2.8(converted to M42)
Mamiya/Sekor 55/1.4
Mamiya/Sekor 135/2.8
Konica AR 40/1.8 (converted to EOS) |
|
Back to top |
|
|
Arlon
Joined: 08 Aug 2008 Posts: 188 Location: http://www.pbase.com/arlon
|
Posted: Tue Aug 19, 2008 12:04 pm Post subject: |
|
|
Arlon wrote:
Are you sure you have the view finder diopter control set properly for your eye? I had that issue and finally went to my left eye because I was against the diopter control stop with my right eye. Getting the diopter adjusted properly and using my left eye was like getting a new camera..
(Nikon D50 and D200)
Maybe it isn't supposed to make a difference but it surely did for my macro shots. Every time I thought I had the eye in focus I got the back of the head. Went to the left eye, adjusted diopter and now I'm spot on.. _________________ D800E, D700, D90, D50, F2, D100 (IR converted)
Stolen: D200 , D70 (IR converted)
Big box of MF lenses from 15mm to 600mm..
Favorites are the micro nikkors (55mm, 105mm and 200mm). |
|
Back to top |
|
|
Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
|
Posted: Tue Aug 19, 2008 3:25 pm Post subject: |
|
|
Farside wrote:
Stan wrote: |
The dioptric correction has nothing to do with the image _already_formed_ on the viewfinder ground glass. It just lets or does not let you view it sharp.
If the picture is sharp in the viewfinder, but the shot is not sharp, or the sharpness in the viewfinder is not consistent with camera AF results - it is definitely focusing screen alignment problem in the camera. Can be solved by adding/removing shims under focusing screen. |
It was definitely a bit of both in my 10D. With the factory screen in place, things improved, but weren't quite right, then I found my method of diopter control was wrong - I was focusing it on the screen image. When I focused it on the etched screen squares it suddenly improved that extra bit - enough to make a difference. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
|
Back to top |
|
|
Stan
Joined: 14 Aug 2008 Posts: 34 Location: Seattle, WA, USA
|
Posted: Tue Aug 19, 2008 3:32 pm Post subject: |
|
|
Stan wrote:
My suggestion would be to use a split-circle focusing screen (aftermarket or original, if available). After I got mine and have it properly adjusted - focusing became a piece of cake. AF confirm becomes a supplementary function, as you do not need it. _________________ Canon 400D
Canon FD 50/1.8 S.C.(converted to M42)
Auto-Topcor 35/2.8(converted to M42)
Mamiya/Sekor 55/1.4
Mamiya/Sekor 135/2.8
Konica AR 40/1.8 (converted to EOS) |
|
Back to top |
|
|
Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
|
Posted: Tue Aug 19, 2008 3:46 pm Post subject: |
|
|
Farside wrote:
Stan wrote: |
My suggestion would be to use a split-circle focusing screen (aftermarket or original, if available). After I got mine and have it properly adjusted - focusing became a piece of cake. AF confirm becomes a supplementary function, as you do not need it. |
I did.
(edit)
Perhaps I should elaborate that a bit - it reads a bit short.
I had the Virtual Village screen and at first it seemed ok, but the shimming issue became a pain in the bum - never could get it quite right and the retaining clip was showing signs of fatigue, so I took the VV screen out and re-installed the factory screen permanently. _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
|
Back to top |
|
|
Stan
Joined: 14 Aug 2008 Posts: 34 Location: Seattle, WA, USA
|
Posted: Tue Aug 19, 2008 4:52 pm Post subject: |
|
|
Stan wrote:
Shimming can be a challenge... I've done this on my 400D. Perhaps, I was lucky to be done within 3 or 4 iterations. _________________ Canon 400D
Canon FD 50/1.8 S.C.(converted to M42)
Auto-Topcor 35/2.8(converted to M42)
Mamiya/Sekor 55/1.4
Mamiya/Sekor 135/2.8
Konica AR 40/1.8 (converted to EOS) |
|
Back to top |
|
|
yalcinaydin
Joined: 20 May 2008 Posts: 825 Location: Izmir, Turkey
|
Posted: Thu Aug 28, 2008 9:45 pm Post subject: |
|
|
yalcinaydin wrote:
I had bought a Split-image Focusing Screen from GI with Cactus triggers. I wan't sure about these 30$ things but I can't justify if it's good or bad because I couln't understand how to use the circles and the split circle on the center.
I've made the diopty adjustment. Is there a guide about how we use this for focusing. I'm thinking of switching back to the original screen.
Mine has some issues:
- Beginning from something like f:4 the half center begins to darken. At f:16 half of the circle is black.
- While looking at my notebook's screen at f.16 the viewfinder is really ugly, I mean it loooks like there are lot's of dust on the surface or it's not a flat surface. Does this mean that it's just a crap
http://www.gadgetinfinity.com/product.php?productid=16976&cat=0&page=1 _________________ My name is "Yalcin", and exactly "Yalçın" and here you can find my MF samples:
http://www.flickr.com/photos/yalcinaydin/sets/
Right now switching back to AF because of work needs but I still love the MF lenses |
|
Back to top |
|
|
Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
|
Posted: Thu Aug 28, 2008 10:38 pm Post subject: |
|
|
Farside wrote:
yalcinaydin wrote: |
I had bought a Split-image Focusing Screen from GI with Cactus triggers. I wan't sure about these 30$ things but I can't justify if it's good or bad because I couln't understand how to use the circles and the split circle on the center.
I've made the diopty adjustment. Is there a guide about how we use this for focusing.
|
What I found worked was to set the dioptre wheel so the auto-focus marks on the screen are pin-sharp. Where I'd been going wrong was trying to get the image sharp and it was misleading. If there are any markings on your replacement screen, try to get them sharp.
Quote: |
Mine has some issues:
- Beginning from something like f:4 the half center begins to darken. At f:16 half of the circle is black.
|
That's normal for a split screen - some of them darken later than others, but in the original film cameras most of these screens were made for you wouldn't have noticed it because you would have been metering wide open most of the time.
Quote: |
- While looking at my notebook's screen at f.16 the viewfinder is really ugly, I mean it loooks like there are lot's of dust on the surface or it's not a flat surface. Does this mean that it's just a crap
|
The slightest bit of dust will show up like a rock _________________ Dave - Moderator
Camera Fiend and Biograph Operator
If I wanted soot and whitewash I'd be a chimney sweep and house painter.
The Lenses of Farside (click)
BUY FRESH FOMAPAN TO HELP KEEP THE FACTORY ALIVE ---
Foma Campaign topic -
http://forum.mflenses.com/foma-campaign-t55443.html
FOMAPAN on forum -
http://www.mflenses.com/fs.php?sw=Fomapan
Webshop Norway
http://www.fomafoto.com/
Webshop Czech
https://fomaobchod.cz/inshop/scripts/shop.aspx?action=DoChangeLanguage&LangID=4 |
|
Back to top |
|
|
|