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Archive 2012 · Aperture does not stop down on C/Y to EOS adapter

alitech
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p.1 #1 · p.1 #1 · Aperture does not stop down on C/Y to EOS adapter

Hi all

I am having trouble with some adapters for the C/Y lenses that I have.

I purchased 3 adapters from different ebay sellers including a high quality one for Kager in HK. Inifnity focus was guaranteed on each listing which is why I went for them. I really did not want to spend stupid amounts of money on adapters but it seems I have no other choice, or maybe I do but I just dont know what I am doing.

I have three lenses

C/Y Zeiss 50 1.7
C/Y Zeiss 28 2.8
C/Y Zeiss 35-70 3.4

I have noticed some play on the 28 2.8 and 35-70 C/Y lenses with the apadtors, furthermore, they aperture ring rotation does not change the f-stop. i.e. it doesnt stop up or down without giving the whole lens a bit of a wobble or shake. Am I supposed to be filing something down on the lens so that aperture works? Is there any experienced people here who have experienced this and how they dealt with it?

I know adapters have been discussed to death on this forum, but it seems like I am none the wiser. I know there are some members who offer services for this sort of thing but I am in the UK and that seriously limits what I can and cannot do with my lenses as I feel I am on my own in the wild (ok slight exaggeration).

There used to be a guy called Son Phin something on this forum but is not active anymore? I heard he had solutions for different sorts of lenses.

I know of Leitax, but I am unsure of this is going to happen with their adapters as well and I really dont want to spend that sort of money to give it a try.

Feb 21, 2012 at 08:35 PM

jcolwell
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p.1 #2 · p.1 #2 · Aperture does not stop down on C/Y to EOS adapter

Sounds strange. I have the three lenses you mention, and they work fine with generic and Fotodiox Pro C/Y to EOS adapters. Could you post a photo or two of a lens or two with your adapters attached? What camera are you using? Your profile only lists a NEX-5N.

Feb 21, 2012 at 09:56 PM

flashinm
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p.1 #3 · p.1 #3 · Aperture does not stop down on C/Y to EOS adapter

I also have the 28 and 35-70 and haven't experienced those type of problems either. Are you saying the lens will stop down if you shake it a bit? Does this happen without the adapter on? What about with the adapter on but not mounted to the camera?

Feb 21, 2012 at 11:55 PM

pdmphoto
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p.1 #4 · p.1 #4 · Aperture does not stop down on C/Y to EOS adapter

Sounds like the aperture arm is hitting something. It might need a little bend or shave.

Feb 22, 2012 at 12:55 AM

mcbroomf
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p.1 #5 · p.1 #5 · Aperture does not stop down on C/Y to EOS adapter

Can you give more info?
Is this happening on all 3 lenses?
Does the aperture close OK with the adapter only?
What camera?
Look at the back of the lens without the adapter on while you open and close the aperture. You'll see a small "tab" moving along a curved slot. Then put the adapter on and see what happens. As said above it sounds like something is fouling the tab.
Report back.... with photos if necessary

Mike

Feb 22, 2012 at 04:46 AM

alitech
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p.1 #6 · p.1 #6 · Aperture does not stop down on C/Y to EOS adapter

This is happening so far only on my 28 2.8 and 35-70 3.4 C/Y lenses. I have a 5D2.

The aperture works fine off the camera even with the adapters connected its just when I mount them to the camera, the aperture does not stop up or down. Need to give it a wobble while I am turning the aperture ring for it to start moving.

The tab is moving fine with and without the adapter.

Will post pics in the evening

Feb 22, 2012 at 04:55 AM

mcbroomf
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p.1 #7 · p.1 #7 · Aperture does not stop down on C/Y to EOS adapter

In addition to the small tab that moves while stopping down the lens there is a larger one that protrudes further from the back of the lens. Shut down the aperture on one of your lenses, then slide that tab (it's sprung) to the other side of it's slot. You'll see that when you do the aperture opens up.

What's happening is that this longer tab is coming up against something in the mirror box, and as you turn the lens to engage it the tab is moving to one side in that slot and preventing the aperture from moving.

The likely reason is that the adapters you bought are too thin and the tab and lens are protruding too far in the the camera. To test this you can 1) verify that you can focus past infinity, and 2) make up a small shim with some pieces of paper or tape to stand off the lens until infinity is properly achieved, then see if the aperture works OK.

There is a possibility that the tab is longer on your lens tyhan it should be but as it's happening to 2 lenses on an adapter I think it's more likely the adapter.

I would return the adapters and get some that are more recommended (but not necessarily expensive), but if you choose to keep them just file a little off the longer tab and they should work fine.

Mike

Feb 22, 2012 at 05:30 AM

AhamB
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p.1 #8 · p.1 #8 · Aperture does not stop down on C/Y to EOS adapter

mcbroomf wrote:
What's happening is that this longer tab is coming up against something in the mirror box, and as you turn the lens to engage it the tab is moving to one side in that slot and preventing the aperture from moving.

The likely reason is that the adapters you bought are too thin and the tab and lens are protruding too far in the the camera. To test this you can 1) verify that you can focus past infinity, and 2) make up a small shim with some pieces of paper or tape to stand off the lens until infinity is...Show more →

Agreed. I have had two samples of the Contax 35-70/3.4 and only one of them had an aperture lever that was blocked by the mirror box of my 5D. None of my other Contax lenses have that problem though, so in my case it was not the adapter but that individual lens.

Feb 22, 2012 at 05:44 AM

alitech
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p.1 #9 · p.1 #9 · Aperture does not stop down on C/Y to EOS adapter

Ok, I will give this a shot and provide some feedback.

So in the event that it is the lens tab thats protruding a little too much, filing it down will work?

Where would I place the pieces of paper, in between the adapter and the lens or the adapter and the body?

What is the best way to check infinity focus as this seems to be a bit of an issue for me.

Feb 22, 2012 at 05:52 AM

AhamB
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p.1 #10 · p.1 #10 · Aperture does not stop down on C/Y to EOS adapter

You can put some tape between the adapter and the lens. Some people recommend aluminium tape for this.

You can best check infinity focus with live view and 10x magnification, of course on a as remote as possible subject. If you can keep turning the focus ring beyond the point where infinity is in focus and everything turns blurry, the adapter is too thin.

Feb 22, 2012 at 06:12 AM

alitech
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p.1 #11 · p.1 #11 · Aperture does not stop down on C/Y to EOS adapter

Ok if the case is that I cannot even reach infinity what does tell me? The adapter is too thick? Well tape still be able to fix this
?

Feb 22, 2012 at 08:33 AM

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p.1 #12 · p.1 #12 · Aperture does not stop down on C/Y to EOS adapter

http://www.davidclapp.co.uk/blog/view/setting-up-camera-adapters-tutorial

Feb 22, 2012 at 09:05 AM

mcbroomf
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p.1 #13 · p.1 #13 · Aperture does not stop down on C/Y to EOS adapter

No, if you can't get to infinity the only way is to thin the adapter. You can do this with fine wet and dry but you run the risk of not doing it evenly and the attachment to the camera will become very loose although some can be tweaked to fatten up the angled flange that engages the camera flange. I would return them though if they are too thick or thin after you've used them to test what the problem is with your lenses, especially as you say they are loose.

Feb 22, 2012 at 09:40 AM

mcbroomf
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p.1 #14 · p.1 #14 · Aperture does not stop down on C/Y to EOS adapter

One other piece of info for your 35-70. On the 5D 1 and 2 this lens may clip the mirror. It seems to depend on the body. The lens has a small curved block attached to the rear lens shroud by 2 very small screws. If you have this problem remove the block unless someone's already done it. This has a good chance of curing the problem, although some people have said that it has not worked (it did for 3 copies of that lens on a 5D body I had). The problem will be worse with a thin adapter of course.

Mike

Feb 22, 2012 at 09:45 AM

AhamB
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p.1 #15 · p.1 #15 · Aperture does not stop down on C/Y to EOS adapter

On one of my samples of the 35-70/3.4 that made the mirror hang, removing that block made no difference at all. It must have been the top of the metal tube to which the block is attached that was catching the mirror.
See: http://picasaweb.google.com/111730807470961284113/Forum?authkey=Gv1sRgCIj8oayrzIXMigE#5512625510141371586

Feb 22, 2012 at 10:44 AM

flashinm
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p.1 #16 · p.1 #16 · Aperture does not stop down on C/Y to EOS adapter

For what it's worth, I had trouble finding an adapter for my 28 that would allow for infinity focus (most were too thick). I finally bought a Haoda adapter based on the recommendation from this forum and it works perfectly. It's more expensive than the cheapos, but it's worth it.

Either way, I would return the adapters you purchased rather than try to modify them.

Feb 22, 2012 at 10:52 AM

davidearls
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p.1 #17 · p.1 #17 · Aperture does not stop down on C/Y to EOS adapter

>>There used to be a guy called Son Phin something on this forum but is not active anymore? I heard he had solutions for different sorts of lenses.

I think you mean Pham Minh Son, who was very active on this forum up until three or four years back. He made C/Y-EOS adapters, among other things. I have one of them.

His adapters are very thin - 1.3mm vs 1.6mm for Big-IS or Fotodiox, so they wouldn't help this problem, since it sounds as if one of the tabs protruding from the back of the lens is fouling on the mirror box. Try stopping the lens all the way down when it's off the camera. Mount it on the camera and open the aperture. Remove the adapter/lens. If the fouling is occurring, you should see a slight smudge on the inside of the mirror box inside the body of the camera.

I encountered this problem with my first alt, a C/Y 28 f2.8. Knowing the lens would never again be mounted on a Yashica body, I taped over the back of the lens and filed the tab down. Obviously you don't want any metal filings inside the lens.

The good news here is that nothing is fouling on the mirror itself. If that were occurring, the mirror would be getting hung when you released the shutter.

FWIW, I don't normally use this adapter much any more. Pham's adapters are very, very tight on the lens and almost impossible to remove if the lens barrel is the same width or wider than the adapter.

Feb 22, 2012 at 10:53 AM

flashinm
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p.1 #18 · p.1 #18 · Aperture does not stop down on C/Y to EOS adapter

If the lenses don't focus to infinity, you do need a thinner adapter although this might make your aperture problem worse. Sounds like you might just be blessed with a picky camera. A combination of a thinner adapter for any that won't focus to infinity and filing down the aperture pin sounds like what you need.

Feb 22, 2012 at 01:19 PM

alitech
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p.1 #19 · p.1 #19 · Aperture does not stop down on C/Y to EOS adapter

Thanks for all your help guys. This forum is a blessing. I will try out all the useful ideas tonight. Just ordered some aluminium tape as well. Will post back findings.

I think I will need to invest in lei tax as well by the sounds of it. Infinity is a bitch to get with these adapters from what I have read so far

Feb 22, 2012 at 01:38 PM

davidearls
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p.1 #20 · p.1 #20 · Aperture does not stop down on C/Y to EOS adapter

Even with Leitax you may need to do infinity focus adjustment, which is very simple with Zeiss lenses. There's a link to shirozina's excellent how-to post in the thread pinned to the top of this forum.

Feb 22, 2012 at 04:17 PM

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