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Orio
Joined: 24 Feb 2007
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Location: West Emilia
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 Posted: Tue Mar 17, 2009 12:05 pm Post subject: Problem with focusing 5D using the screen |
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Orio wrote:
Lately (very recently) my 5D has developed a problem with focusing using the screen.
While the focusing with chipped adapters is perfect, the focusing screen gives me wrong distance, in other words, it makes me focus more distant than the aim.
To give an example, if I close focus to an object that is distant 20 cm, if I focus using the chipped adapter, focus is ok, if I focus using the screen, the focus falls somewhere more distant, like 21 or 22 centimetres.
If I focus more distant objects, the gap widens, for instance if I screen-focus on an object that is distant 2 meters, the real focus falls on 2,20 meters.
I have tried moving the focusing screen (unmounting and remounting it) but I obtain the same result.
What if I remove the metal shin that is between the screen and the pentaprism? Would the situation improve or get worse?
Any idea for fixing the problem?
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poilu
Joined: 26 Aug 2007
Posts: 10472
Location: Greece
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| Posted: Tue Mar 17, 2009 12:17 pm Post subject: |
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poilu wrote:
your mirror is probably slowly falling down and register distance change
http://cpn.canon-europe.com/content/news/eos_5d_mirror_repair.do |
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Orio
Joined: 24 Feb 2007
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| Posted: Tue Mar 17, 2009 12:23 pm Post subject: |
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Orio wrote:
poilu, if the problem was in the mirror, don't you think that also the electronic focus confirmation would give a wrong result?
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poilu
Joined: 26 Aug 2007
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| Posted: Tue Mar 17, 2009 1:12 pm Post subject: |
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poilu wrote:
I think that the focus hardware is behind the semi-transparent mirror and it isn't disturbed by mirror move |
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
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| Posted: Tue Mar 17, 2009 3:56 pm Post subject: |
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Orio wrote:
I read a bit about the subject, it seems that the mirror just falls. Mine seems very solidly anchored to it's place...
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poilu
Joined: 26 Aug 2007
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Location: Greece
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| Posted: Tue Mar 17, 2009 4:21 pm Post subject: |
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poilu wrote:
I just make hypothesis based on a previous post about micro movements
| Orio wrote: |
| Today, one year after having shaved my 5D, I had to shave it again. After one year of use, micro movements must have happened, and the mirror begun to not clear the way to some of my lenses again |
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
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| Posted: Tue Mar 17, 2009 4:24 pm Post subject: |
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Orio wrote:
Yes, correct. Maybe you are right, but I'm not sure.
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poilu
Joined: 26 Aug 2007
Posts: 10472
Location: Greece
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| Posted: Tue Mar 17, 2009 4:29 pm Post subject: |
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poilu wrote:
| Orio wrote: |
| I read a bit about the subject, it seems that the mirror just falls |
maybe you discovered the problem early because of manual focus (screen off & lens clearance)
a AF user will only understand it when the mirror falls
if it can be fixed just by gluing the mirror, it must be a easy fix |
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visualopsins
Joined: 05 Mar 2009
Posts: 11020
Location: California
Expire: 2025-04-11
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| Posted: Tue Mar 17, 2009 4:31 pm Post subject: speculation |
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visualopsins wrote:
if this were my 5D i'd be wondering why it started all-of-a-sudden.
yes it seems like adjusting the focus screen shimming will fix vf focus; it may be physically easier to *add* a shim and check which way vf focus gets adjusted, before removing and possibly destroying the existing shim and then discovering more shim not less was needed...
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Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Tue Mar 17, 2009 4:36 pm Post subject: |
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Orio wrote:
| poilu wrote: |
| Orio wrote: |
| I read a bit about the subject, it seems that the mirror just falls |
maybe you discovered the problem early because of manual focus (screen off & lens clearance)
a AF user will only understand it when the mirror falls
if it can be fixed just by gluing the mirror, it must be a easy fix |
Fact is, I inspected with a loupe, I can not see any abnormalities. It there is a problem with the mirror it must be really microscopical.
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Orio
Joined: 24 Feb 2007
Posts: 29545
Location: West Emilia
Expire: 2012-12-04
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| Posted: Tue Mar 17, 2009 4:37 pm Post subject: Re: speculation |
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Orio wrote:
| siriusdogstar wrote: |
if this were my 5D i'd be wondering why it started all-of-a-sudden.
yes it seems like adjusting the focus screen shimming will fix vf focus; it may be physically easier to *add* a shim and check which way vf focus gets adjusted, before removing and possibly destroying the existing shim and then discovering more shim not less was needed... |
I would like to try, but I have no idea where to get extra shims.
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Orio, Administrator
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NE CEDE MALIS AUDENTIOR ITO
Ferrania film is reborn! http://www.filmferrania.it/
Support the Ornano film chemicals company and help them survive!
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visualopsins
Joined: 05 Mar 2009
Posts: 11020
Location: California
Expire: 2025-04-11
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| Posted: Tue Mar 17, 2009 6:13 pm Post subject: hope i don't step on any toes with this post :) |
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visualopsins wrote:
http://forum.cogitech.ca/viewtopic.php?f=58&t=25
some folks have used material from thin plastic bag, and thin paper such as for rolling cigarettes; this is what i'd use for a simple test to see if i needed to remove the original shim.
_________________
☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮ like attracts like! ☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮☮
Cameras: Sony ILCE-7RM2, Spotmatics II, F, and ESII, Nikon P4
Lenses:
M42 Asahi Optical Co., Takumar 1:4 f=35mm, 1:2 f=58mm (Sonnar), 1:2.4 f=58mm (Heliar), 1:2.2 f=55mm (Gaussian), 1:2.8 f=105mm (Model I), 1:2.8/105 (Model II), 1:5.6/200, Tele-Takumar 1:5.6/200, 1:6.3/300, Macro-Takumar 1:4/50, Auto-Takumar 1:2.3 f=35, 1:1.8 f=55mm, 1:2.2 f=55mm, Super-TAKUMAR 1:3.5/28 (fat), 1:2/35 (Fat), 1:1.4/50 (8-element), Super-Multi-Coated Fisheye-TAKUMAR 1:4/17, Super-Multi-Coated TAKUMAR 1:4.5/20, 1:3.5/24, 1:3.5/28, 1:2/35, 1:3.5/35, 1:1.8/85, 1:1.9/85 1:2.8/105, 1:3.5/135, 1:2.5/135 (II), 1:4/150, 1:4/200, 1:4/300, 1:4.5/500, Super-Multi-Coated Macro-TAKUMAR 1:4/50, 1:4/100, Super-Multi-Coated Bellows-TAKUMAR 1:4/100, SMC TAKUMAR 1:1.4/50, 1:1.8/55
M42 Carl Zeiss Jena Flektogon 2.4/35
Contax Carl Zeiss Vario-Sonnar T* 28-70mm F3.5-4.5
Pentax K-mount SMC PENTAX-A ZOOM 1:3.5 35~105mm, SMC PENTAX ZOOM 1:4 45~125mm
Nikon Micro-NIKKOR-P-C Auto 1:3.5 f=55mm, NIKKOR-P Auto 105mm f/2.5 Pre-AI (Sonnar), Micro-NIKKOR 105mm 1:4 AI, NIKKOR AI-S 35-135mm f/3,5-4,5
Tamron SP 17mm f/3.5 (51B), Tamron SP 17mm f/3.5 (151B), SP 500mm f/8 (55BB), SP 70-210mm f/3.5 (19AH)
Vivitar 100mm 1:2.8 MC 1:1 Macro Telephoto (Kiron)
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nathaniel
Joined: 02 Mar 2009
Posts: 45
Location: Izmir, TURKEY
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| Posted: Tue Mar 17, 2009 10:21 pm Post subject: |
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nathaniel wrote:
Orio, you can use the tape from the first aid kit  Below you can see my 350D's shim. I had same focus problem but it was opposite side  First I added this tape but the gap got bigger, so I took the shim out completely.
In your 5D adding some tape will solve the problem.
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Pentax K-5 + Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF]
Canon Eos 350D + Canon 15-85mm f/3.5-5.6 USM IS
Carl Zeiss Jena DDR Flektogon MC 35mm f/2.4
Carl Zeiss Jena DDR Sonnar MC 135mm f/3.5
Helios 44-2 58mm f/2
RMC Tokina 24mm f/2.8 |
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