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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Mon Mar 24, 2014 7:17 pm Post subject: MTO 500mm f6.3 cat |
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betacapricorni wrote:
Hi everyone,
I'm looking for this catadioptric 500mm for astronomical and "sunday" use, i've found one here in Italy: 500mm f6,3, bag, 3 coloured filters at 150 euros. Is the price good?
The seller say to me that the mto doesn't fit in the 500d due the canon flash-case but it is possible change the "infinity" mto backfocus ( by a tecnichan and loosing a little bit of focus at minimal distance) and use a 7mm extension.
What i've to do? |
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ForenSeil
Joined: 15 Apr 2011 Posts: 2726 Location: Kiel, Germany.
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Posted: Mon Mar 24, 2014 7:35 pm Post subject: |
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ForenSeil wrote:
Price is normal (not overpriced but also not very cheap) if condition is good.
For astrowork I would rather look for the MTO 1000mm F10 though.
Do you already have eyepieces etc.? It might be easier to look/wait for an Celestron, Meade etc. Schmidt Cassegrain with mount+tripod+eyepieces set on Ebay etc., no work by a technician necessary and ready to start.
Instead of spending money into a technician you could also look for an used mirrorless camera body like NEX or µFT (can be had for 80-180€). _________________ I'm not a collector, I'm a tester
My camera: Sony A7+Zeiss Sonnar 55/1.8
Current favourite lenses (I have many more):
A few macro-Tominons, Samyang 12/2.8, Noritsu 50.7/9.5, Rodagon 105/5.6 on bellows, Samyang 135/2, Nikon ED 180/2.8, Leitz Elmar-R 250/4, Celestron C8 2000mm F10
Most wanted: Samyang 24/1.4, Samyang 35/1.4, Nikon 200/2 ED
My Blog: http://picturechemistry.own-blog.com/
(German language) |
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Mon Mar 24, 2014 7:52 pm Post subject: |
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betacapricorni wrote:
Hi!
F10 is too dark for deep sky image, i've just 3 telescope but i'm lookin for a 500 mm to take deep sky image when i go to mountain and i can't carry mount, telescope etc. |
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sammo
Joined: 04 Jan 2012 Posts: 223 Location: CH and SI
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Posted: Mon Mar 24, 2014 8:20 pm Post subject: |
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sammo wrote:
You need a good mount anyway if you want to take photos at 500mm... |
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Mon Mar 24, 2014 8:38 pm Post subject: |
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betacapricorni wrote:
I've an eq6 and an heq5 and i take pic at 1370mm to with my RC |
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ForenSeil
Joined: 15 Apr 2011 Posts: 2726 Location: Kiel, Germany.
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Posted: Tue Mar 25, 2014 4:34 pm Post subject: |
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ForenSeil wrote:
betacapricorni wrote: |
Hi!
F10 is too dark for deep sky image, i've just 3 telescope but i'm lookin for a 500 mm to take deep sky image when i go to mountain and i can't carry mount, telescope etc. |
1000mm F10 gives actually a brighter image at the same magnification as an 500 F6.3 and has better IQ as far as I know; simply use an longer focal length eyepiece.
My 2000mm F10 works quite well for deep sky btw., "only" F10 but actually several times brighter than a 500/6.3
If you want something fast and bright you could look for an "Comet Catcher" like Celestron 500/3.6 - works very good for photography aswell (very sharp center) and compact enough to put it into a backpack and light enough to mount it on a decent photocamera tripod. I bought mine for 180€ on Ebay two years ago.
http://forum.mflenses.com/celestron-500mm-f3-6-comet-catcher-t55297,highlight,%2Bcelestron.html
Lichtenknecker has similar speed mirror lenses for astro photography which have awesome IQ btw., but they are rare as they are not longer in production since the 80ies. _________________ I'm not a collector, I'm a tester
My camera: Sony A7+Zeiss Sonnar 55/1.8
Current favourite lenses (I have many more):
A few macro-Tominons, Samyang 12/2.8, Noritsu 50.7/9.5, Rodagon 105/5.6 on bellows, Samyang 135/2, Nikon ED 180/2.8, Leitz Elmar-R 250/4, Celestron C8 2000mm F10
Most wanted: Samyang 24/1.4, Samyang 35/1.4, Nikon 200/2 ED
My Blog: http://picturechemistry.own-blog.com/
(German language)
Last edited by ForenSeil on Sat Mar 29, 2014 3:26 pm; edited 1 time in total |
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Tue Mar 25, 2014 7:28 pm Post subject: |
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betacapricorni wrote:
Yes but for every exposition minute with 6.3 i've to expose 4 minutes at f10 to have the same nose/signal ratio. Too slow for deep sky image. I've had a comet catcher, it was a "comet factory" for the coma in the corners |
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Attila
Joined: 24 Feb 2007 Posts: 57865 Location: Hungary
Expire: 2025-11-18
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Posted: Wed Mar 26, 2014 1:00 am Post subject: |
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Attila wrote:
I have 500mm 6.3 long time ago, I didn't use it much , but I was amazed by quality so I kept it as one of the best 500mm lens what I can afford. (bellow 500 USD) I had 1000mm at least twice , I did try it once, I was pretty amazed by sharpness and distance , but... I never use it for sure so I sold it. _________________ -------------------------------
Items on sale on Ebay
Sony NEX-7 Carl Zeiss Planar 85mm f1.4, Minolta MD 35mm f1.8, Konica 135mm f2.5, Minolta MD 50mm f1.2, Minolta MD 250mm f5.6, Carl Zeiss Sonnar 180mm f2.8
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Wed Mar 26, 2014 10:37 am Post subject: |
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betacapricorni wrote:
Thanx for informations Attila! |
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ZoneV
Joined: 09 Nov 2009 Posts: 1632 Location: Germany
Expire: 2011-12-02
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Posted: Wed Mar 26, 2014 11:09 am Post subject: Re: MTO 500mm f6.3 cat |
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ZoneV wrote:
betacapricorni wrote: |
...The seller say to me that the mto doesn't fit in the 500d due the canon flash-case but it is possible change the "infinity" mto backfocus ( by a tecnichan and loosing a little bit of focus at minimal distance) and use a 7mm extension.
What i've to do? |
For some of my lenses I had the same problem, the EOS flash case is to big, so I cut it away:
_________________ Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
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ForenSeil
Joined: 15 Apr 2011 Posts: 2726 Location: Kiel, Germany.
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Posted: Wed Mar 26, 2014 9:48 pm Post subject: |
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ForenSeil wrote:
betacapricorni wrote: |
Yes but for every exposition minute with 6.3 i've to expose 4 minutes at f10 to have the same nose/signal ratio. Too slow for deep sky image. I've had a comet catcher, it was a "comet factory" for the coma in the corners |
Ah okay, I didn't get that you wan't to use an F6.3 only lens for deep sky photography directly. I though you would like to use it as telescope visually and as "normal" lens.
And of course the comet catcher would be an unusable coma catcher on APS-C sized sensors for deep sky, that would be more something for µFT maybe. But are you sure you need an 500mm for deep sky photography, that's pretty long, do you already have an 180/2.8 etc.? Then the MTO 500/6.3 should be the best choice indeed if you don't want to spend much more or wait for an Lichtenknecker Flatfield (unlike the Comet Catcher they don't have coma issues)! _________________ I'm not a collector, I'm a tester
My camera: Sony A7+Zeiss Sonnar 55/1.8
Current favourite lenses (I have many more):
A few macro-Tominons, Samyang 12/2.8, Noritsu 50.7/9.5, Rodagon 105/5.6 on bellows, Samyang 135/2, Nikon ED 180/2.8, Leitz Elmar-R 250/4, Celestron C8 2000mm F10
Most wanted: Samyang 24/1.4, Samyang 35/1.4, Nikon 200/2 ED
My Blog: http://picturechemistry.own-blog.com/
(German language) |
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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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Posted: Thu Mar 27, 2014 2:35 am Post subject: |
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Farside wrote:
You can alter the focus/infinity stop on these lenses, yes.
Under the rubber body cover, there are three screws, and a pair of stop limit screws - easily done, and there's a couple of web pages (including a couple of posts here ) on how to do it.
I did similar with my Rubinar 300, to fit my Pentax (same problem with the flash mount). I made a simple mount extension to physically space the lens from the body, then re-set the infinity stop. _________________ 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 |
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Thu Mar 27, 2014 12:12 pm Post subject: |
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betacapricorni wrote:
@ZoneV
the flash works correctly yet?
@ForenSeil
i've an helios 44/2, a jupiter 135 f3.5 and a Jupiter 200 f4 but all of this must work at f4 because the narrowband Halfa filter works correctly only from f4
@Farside
may you post me a webpage please? ( in italian i can't find nothing ) |
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sammo
Joined: 04 Jan 2012 Posts: 223 Location: CH and SI
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Posted: Thu Mar 27, 2014 4:18 pm Post subject: |
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sammo wrote:
betacapricorni wrote: |
i've an helios 44/2, a jupiter 135 f3.5 and a Jupiter 200 f4 but all of this must work at f4 because the narrowband Halfa filter works correctly only from f4
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Some work at f/2.8 too. There's even one guy who did narrowband with a 200mm f/1.8 Canon wide open, but don't know what filters he used. |
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Thu Mar 27, 2014 5:09 pm Post subject: |
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betacapricorni wrote:
I've an Astronomik 12nm and i'll try as soon as possible at f2 with helios 44 |
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ZoneV
Joined: 09 Nov 2009 Posts: 1632 Location: Germany
Expire: 2011-12-02
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Posted: Thu Mar 27, 2014 8:11 pm Post subject: |
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ZoneV wrote:
betacapricorni wrote: |
@ZoneV
the flash works correctly yet?
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Yes, this is only a housing for the flash in the off position. _________________ Camera modification, repair and DIY - some links to look through: http://www.4photos.de/camera-diy/index-en.html
I AM A LENS NERD!
Epis, Elmaron, Emerald, Ernostar, Helioplan and Heidosmat.
Epiotar, Kameraobjektiv, Anastigmat, Epis, Meganast, Magnagon, Quinar, Culmigon, Novotrinast, Novflexar, Colorplan, Sekor, Kinon, Talon, Telemegor, Xenon, Xenar, Ultra, Ultra Star. Tessar, Janar, Visionar, Kiptar, Kipronar and Rotelar.
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Farside
Joined: 01 Sep 2007 Posts: 6557 Location: Ireland
Expire: 2013-12-27
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Mon Mar 31, 2014 7:57 pm Post subject: |
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betacapricorni wrote:
Thanks so much! |
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ForenSeil
Joined: 15 Apr 2011 Posts: 2726 Location: Kiel, Germany.
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Posted: Mon Mar 31, 2014 9:22 pm Post subject: |
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ForenSeil wrote:
betacapricorni wrote: |
I've an Astronomik 12nm and i'll try as soon as possible at f2 with helios 44 |
Looking forward your results! I've never made any deep sky with narrowband filters
In my experience only a very very few 50mm lenses do work well for deep sky and Biotar design is not known to have good corners. The filter might improve IQ (or at least reduce CAs) though.
Usually it's easiest to start with a decent 135mm-200mm lenses for beginners and large and bright objects like andromeda.
Good luck (and good weather!)!
_________________ I'm not a collector, I'm a tester
My camera: Sony A7+Zeiss Sonnar 55/1.8
Current favourite lenses (I have many more):
A few macro-Tominons, Samyang 12/2.8, Noritsu 50.7/9.5, Rodagon 105/5.6 on bellows, Samyang 135/2, Nikon ED 180/2.8, Leitz Elmar-R 250/4, Celestron C8 2000mm F10
Most wanted: Samyang 24/1.4, Samyang 35/1.4, Nikon 200/2 ED
My Blog: http://picturechemistry.own-blog.com/
(German language) |
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betacapricorni
Joined: 22 Mar 2014 Posts: 18
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Posted: Sat Apr 12, 2014 7:47 pm Post subject: |
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betacapricorni wrote:
as soon as possible when i take some pic i'll post! |
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