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pleto
Joined: 18 Oct 2019
Posts: 37
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 Posted: Thu Feb 03, 2022 6:02 pm Post subject: Canon 5D mk II half mirror stays down when mirror gets up |
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pleto wrote:
On Sunday I started to have some shots coming up with almost half the lower frame unexposed in my 5D Mark II.
I realized by locking up the mirror with the mirror lockup function that a plate that lies under the mirror and which should accompany it when moving often gets instead locked in a position parallel to the shutter, so blocking the light that goes to the upper part of the sensor for a good third of it.
A small mirror can be seen on this plate that I never had known of.
The image may explain a lot more
https://www.flickr.com/photos/194732689@N07/51859175797/in/dateposted-public/
I'm thinking of supergluing the part back to the main mirror (that, as I said, works regularly) given that I hope to retire this old camera this year.
If I push it against the lifted mirror it clicks into place.
I also wonder if some little part hasn't detached but I see no evidence for this.
Ty for any comment |
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visualopsins
Joined: 05 Mar 2009
Posts: 10528
Location: California
Expire: 2025-04-11
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| Posted: Thu Feb 03, 2022 8:27 pm Post subject: |
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visualopsins wrote:
Hi pleto,
If memory serves the 5D classic had an engineering defect which caused the mirror to detach. Canon had a fix. I don't know if Canon had corrected for the II model. Maybe check Canon web site.
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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
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RokkorDoctor
Joined: 27 Nov 2021
Posts: 1266
Location: Kent, UK
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| Posted: Thu Feb 03, 2022 10:55 pm Post subject: |
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RokkorDoctor wrote:
Isn't that simply the autofocus mirror underneath the main mirror failing to flip out of the way?
I suspect that glueing that to the main mirror will render the camera's autofocus inoperable...
https://photo.stackexchange.com/questions/98133/my-secondary-mirror-won-t-go-up-with-the-main-mirror
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Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
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pleto
Joined: 18 Oct 2019
Posts: 37
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| Posted: Fri Feb 04, 2022 6:15 am Post subject: |
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pleto wrote:
I attend this forum because I only use MF lenses, I have just one AF zoom that I never use... plus camera is going to be retired within this summer.
As a temp measure to continue to use it I taped the submirror to the main, I have lost AF which I do not need but now I can use the camera.
I have a couple APS-cx to work with too but this is my only ff and I have a huge amount of MF lenses.
The only drawback of this solution is that the submirror now projects a ghost image on the main one, a defect that can be eliminated by masking it as well and then taping it back to the main mirror.
I grew up with film cameras so i never feel a necessity for AF, since I do not to sports or birdwatching. I mostly do bokeh shots or portraits in the old style ... and no reporting or pro use at all.
In the meantime I will try to understand if I can repair this defect without dismantling the camera, which means that most likely it will stay like this.
Any repair suggestion is welcome, though |
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RokkorDoctor
Joined: 27 Nov 2021
Posts: 1266
Location: Kent, UK
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| Posted: Fri Feb 04, 2022 11:28 am Post subject: |
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RokkorDoctor wrote:
Well, if you are happy to use it with MF lenses only than there is not a lot to worry about 
If you do decide to fix it, be aware that alignment of the secondary (autofocus) mirror is critical. After each shutter release this mirror will need to return to its original position such that the optical path length from the mount-to-autofocus sensor is retained within a 0.02mm repeatability or so of the specified calibration.
At least that is the level of accuracy required on the optical path in film cameras to make fast f/1.4 lenses focus consistently; e.g. in Minolta's service manuals for the XD7/XD11 the mount register is specified to a +/- 0.01mm accuracy.
It wouldn't surprise me if the likes of Leica might even go one better with an accuracy of +/-0.005mm or so.
_________________
Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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