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Canon Rangefinders - Peter Dechert and Peter Kitchingman Peter Dechert is best known for his Canon Rangefinder, Canon SLR, and Olympus Pen books, the latter two long out-of-print. He was a monthly columnist for many years for SHUTTERBUG magazine, and has contributed to many others. Most recently he has written about the pre-WW2 Zeiss 35mm cameras, but his interests in camera equipment and optics are many and varied. As a pro protographer and honorary life member of ASMP, Peter is also expert in using the gear! Peter Kitchingman - author of Canon Rangefinder Lens book Peter Kitchingman's 'Canon M39 Rangefinder Lenses 1939-71' book is the definitive source on these very interesting optics. His interests also go to the entire Canon Rangefinder system and beyond.

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Canon 7 question
Old 06-25-2016   #1
dougcee
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Canon 7 question

Hi, new member here!
Quick question. I am now the owner of a nice clean Canon 7. All working fine except one thing. The rangefinder works as it should and is clean, but there is a noticeable double image all the time on the patch, even when split images have converged. Alignment or mirrors de-silvering?
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Old 06-25-2016   #2
02Pilot
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Is it a vertical double image? If so, you just need to adjust the vertical alignment of the RF.
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Old 06-25-2016   #3
dougcee
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O2, it is vertical and horizontal. It's frustrating because the rest of the camera is just great. I haven't run a roll of film through yet, so I'll see if it focuses OK the way it is.
There is a local repair guy who said it might be mirrors going south when I described the problem to him over the phone.
Thanks for your input!
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Old 06-25-2016   #4
02Pilot
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So the images never line up properly? More than likely it's just a combination of vertical and horizontal adjustment. If the mirror was shot, the image would be hard to see, not out of alignment.
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Any man who can see what he wants to get on film will usually find some way to get it;
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Old 06-26-2016   #5
dougcee
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Well, there always seems to be a faint but noticeable double image even when the main images merge. It's usable I guess, but always the slight horizontal and vertical shadow.
Imagine looking at a sharp 3 dimensional letter T that was against a wall and casting a horizontal and vertical shadow less than the letter's own thickness. That's what it's like.
Thanks O2!
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Old 06-26-2016   #6
02Pilot
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OK, I think I understand what you're describing. I suppose it could be a mirror issue, but if you can focus accurately without too much distraction from the double image, I'd be inclined to just leave it alone and shoot it.
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Any man who can see what he wants to get on film will usually find some way to get it;
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Old 06-26-2016   #7
dougcee
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Yes, I'm inclined to agree. I'll see how the first roll of film looks and if good I'll probably just deal with the minor irritation. Appreciate your help on this 02!
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ghost image
Old 05-24-2019   #8
DavidC
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ghost image

What you describe is called a ghost image. Canon rangefinders mostly the 7 series seem to uniformly suffer from this ailment. Whether it is the mirror design I don't know. Even my latest Canon 7Sz suffers from this problem although to a lesser degree. That is why Leica rangefinder patches are so good--no flare and ghosting.
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Old 05-24-2019   #9
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Take the cover off and clean the prisms in the rangefinder. It made a big difference on mine.

https://www.youtube.com/watch?v=w7diog_cxus&

Shawn
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Old 05-24-2019   #10
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Ghost images and zombie threads...
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Old 05-26-2019   #11
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With a back-silvered mirror (as most glass mirrors are) you can get a secondary reflection from the face of the glass, especially as the glass ages. I expect the shadow image is caused by this. I do not know if old glass can be cleaned to restore (remove) this or not.
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