Canon LTM !00mm 3.5 LTM Canon , apeture?

Canon M39 M39 screw mount bodies/lenses
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John Elder

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I bought a Canon 100mm 3.5 ltm on e-bay which I recieved today. The glass is very good, no scratches, a little dust, nothing that bothers me. However the apeture is supposed to be click stopped and it is not. It is described in the Canon catalogue as click stopped. On further inspection I can see the aperture device which allows the aperture to open and close. The device(s) look like little pistons that go in and out as the apeture opens and closes. These little pistons are located at the far edges of the cylinder. I beilieve that I shouldn't be able to see these pistons. I can't on other canon LTM lens. I think a part is missing which would hide these pistons and Maybe(?) at the same time provide click stops. The focus is accurate on the lens, but the focus is tight. The lens came with a canon 100 finder and leather case in great condition. I paid 117.00 for the kit:lens, finder and leather case. I have 2 other Canon lens that are clicked stopped and I can not see the pistons allowing for the moving of the aperture. What bothers me the most is not the lack of clickstops , but seeing the pistons at the outer edge of the diaphram. I am afraid of a light leak. Will those of you who own the Canon 100 3.5 Ltm, look at their lens and inform me if they can se the pistons I am referring. They are easy to see, if they can be seen. Also. I wonder what a fix would cost to get the lens fixed and by whom. Thanks for any info. Any advice would be appreciated. John Elder
 
John -- I'll take a look at mine when I got home this evening. But, FWIW, mine doesn't have click stops either. The aperture ring works fine otherwise (maybe a little loose but I can live w/ that).

A 100/3.5 w/ good glass, with a case and finder in great condition for $117.00 sounds like a very good deal to me.
 
I think your lens is OK, and the finder plus lens plus case for $117 sounds like a good deal.

My lens does not click and the mechanism that you describe ("pistons") looks like what I see in mine.

My lens takes lovely images, I suspect that yours will too.

Tiny, so a great travel lens, with your choice of screwmount Leica, R2, or with an M adaptor, the CL, R2a, or M series.


Enjoy.


- Mike
 
How to I get this thread tranferred to the Canon Rangefinder foum? I tried to post it their, but failed due to my own ignorance. PS to above thread. The catalogue for Canon Serenar lens desribes the aperture as clicked stopped. My other 2 Canon LTM serenars are as decribed:click stopped. Any info is greatly appreciated? Thanks guys!
 
The lens sounds OK to me. You can see the pivot points (the pistons) for the aperture blades looking through the front of this lens. This is normal.

Some of the Canon 100/3.5 lenses have click stops, some do not. The chrome and most of the chrome and black versions do not have click stops, to the best of my knowledge. The late-model all-black version has click stops.

Is your lens chrome, chrome and black, or all black?
 
No click stops on mine -- and no obvious place in the design to put the mechanism.

The pins on the aperture blades ("pistons") normally show.
 
My Canon 100/3.5 chrome-and-black does not have click stops. It does have one of the roundest and most circular apertures, when stopped down, that I've ever seen.

Jim B.
 
Thanks guy! I have an early Black and chrome version WITH the catalogue that was in existance at the time "my" 100 3,5 was made. The catalogue indicates it has click stops. I had never seen the pivot points or pistons in any lens whatsoever, so the informnation you guys have given me make me feel good about the lens. Execpt for a little dust in the lens, this baby is almost Mint. I have wanted this lens for a few years and have been waiting for a good deal. The first time I bought this type lens, I returned it to seller because of excessive scratches. So. I'm feeling better and better. This really is a great forum. There is no B S and you great great info fast. Now for a hood, which I hear is a tough find. I have a very good Leitz Elmar 90 LTM and I will perform test on these 2 lens and post the results in a couple months, Thanks again!
 
Looking forward to seeing your test shots, John. I've got a really nice 100/3.5 too, and have been borrowing an uncoated 90 Elmar w/ glass in lovely condition as well. I've shot w/ both lenses but not done a side-by-side comparison. My 100/3.5 is also early-ish black and chrome. I love the compact size and sharpness of this lens, and it also can produce nice 3D effects and tones:

1593234267_19676d67f3.jpg
 
Hi,

The click stops didn't start until Canon produced the predominantly black bodied lens early in 1960. None of the chrome/black lenses had click stops OR none of mine have. Would have to check my lens internals when I get home but from memory I think what your calling pistons is actually a small semi rotating pin which holds the blades. Never pulled one apart so not sure. Peter
 
John -- Just home, checked my lens, and agree w/ Dexdog above. I think what you're describing as pistons are normal, and quite visable looking through the front of the lens.

Cheers! And enjoy your lens!
 
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