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Hi_country_flash
Tinkerer
Username: Hi_country_flash
Post Number: 30
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 04:01 pm: | 
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I just today received a 1951 Canon III Rangefinder I bought, It is in beautiful condition and seems to work perfectly , if I can just figure out how to load it, never had anything this close to a Leica before.
The one strange problem I found is siome kind of strange junk inside the lens. When I first saw it I thought the aperture blades had fallen out, but thats not it , the aperture works perfect. I have attached a couple of not too hot pics of the gunk, looks almost like flakes of black paint , BIG ONES . Any idea what it might be ? |
Hi_country_flash
Tinkerer
Username: Hi_country_flash
Post Number: 31
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 04:05 pm: |
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Rats , Forgot the pics!!!   |
Waynemel
Tinkerer
Username: Waynemel
Post Number: 446
Registered: 08-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 04:12 pm: |
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Flakes of paint from the inside surfaces of the lens? |
Hi_country_flash
Tinkerer
Username: Hi_country_flash
Post Number: 32
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 04:27 pm: |
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I suppose that's possible , however I can not see any evidence that there is paint inside lens and also see no sign of chipping if there is paint there. |
Hi_country_flash
Tinkerer
Username: Hi_country_flash
Post Number: 33
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 04:33 pm: |
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Never having had a seranar lens , I have not been inside one . It should present no unusual problems to remove the rear element to get these critters out , or will it? |
Dxqcanada
Tinkerer
Username: Dxqcanada
Post Number: 32
Registered: 11-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 06:41 pm: |
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You should be able to get through to the interior from the rear.
You will need a couple of spanning wrenches.
http://jelabs.blogspot.ca/2011/04/canon-serenar-f18-50mm-ltm-lens.html |
Dxqcanada
Tinkerer
Username: Dxqcanada
Post Number: 33
Registered: 11-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 06:43 pm: |
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Instruction Manual
http://www.butkus.org/chinon/canon/canon_iii-a_iv-s/canon_iii-a_iv-s.htm |
Br1078lum
Tinkerer
Username: Br1078lum
Post Number: 551
Registered: 11-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, May 13, 2013 - 08:47 pm: |
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I've heard of paint flakes inside lenses before. Just never seen any that big. But it is an old lens, so anything is possible. Once you get it open, you may want to put some Testors Military Flats Black on it, or the Krylon equivilent.
And in the future, please be so nice as to stack your photos, instead of putting them on the same line.
Thanks,
PF |
Hollenbj
Tinkerer
Username: Hollenbj
Post Number: 123
Registered: 03-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 14, 2013 - 11:51 am: |
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Paint flakes.
Not that unusual in an old Serenar. Where was this camera stored for the last many years?
I've been inside a few Serenar lenses (50mm, 28mm, 135mm). You're in luck. They're all straightforward. Almost enjoyable. The 50/1.8 has a bit of reputation for hazing too. Might as well clean those elements while your inside. Funny, there was a recent thread on this forum about painting inside a lens; I've been using Testors Flat Black and a small decent quality brush. Again, should be no problem. Once you're done with your repairs and cleaning, you will have a really great lens. A favorite of mine. |
Hi_country_flash
Tinkerer
Username: Hi_country_flash
Post Number: 36
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 14, 2013 - 12:35 pm: |
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Since these "Flakes " move so freely around inside the lens which would be least difficult,taking the front element out to reach them or the rear? They do appear to be between the front element and the center. |
Hi_country_flash
Tinkerer
Username: Hi_country_flash
Post Number: 37
Registered: 12-2012
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 14, 2013 - 12:41 pm: |
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BR--- The pictures are stacked on my screen, try Google chrome , some others put them inline. I would not like that either. |
Rick_oleson
Tinkerer
Username: Rick_oleson
Post Number: 1304
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 14, 2013 - 05:29 pm: |
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I'd probably try going in the front first.
Negative elements are thin at the center and very thick at the edge - the big beveled edge has to be painted black to control flare in the lens. Even if the paint has not come off, if you see light-colored areas in the paint when looking at it through the glass, you should scrape the loose paint off and repaint it (I just use black Testors model paint). Air bubbles between the paint and the glass will defeat its anti-reflection purpose. |
Br1078lum
Tinkerer
Username: Br1078lum
Post Number: 553
Registered: 11-2010
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, May 14, 2013 - 07:38 pm: |
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HCF, I'm tired of everyone telling me I HAVE to use some other program than what I am using. Don't programmers go by any standards anymore? I could rant on, but this isn't a computer forum. But I do know that no matter how it looks on your screen, if you don't use line breaks, they come out in a line on more than just my screen.
The serenar should not be a hard lens to take apart, as I've de-hazed a later version quite easily. It's a pretty straightforward construction, but you do need spanners.
PF |
