Best Contax/Yashica to EOS Adapter

calvin83 · Joined: 12 Apr 2009 Posts: 7581 Location: Hong Kong

I think the K&F is good for a cheap adapter Click here to see on Ebay judging from the sales volume and the feedback here. The one made by Yeenon Click here to see on Ebay is worth to consider especially for certain lens that will interfere with the mirror box(similar to the DSLRExchange-adapter mentioned above but this one has been produced for a long time with pretty good precision compare to other adapter). However, some of the lens may have slightly different tolerance. One may need to adjust their lens even using the most expensive adapter such as the one made by RAYQUAL http://www.rayqual.com/.

europanorama · Joined: 27 May 2012 Posts: 128

Which tolerance?
its all about infinity and lens adjusted to it and mirror-clearance.
you dont mean lens-locking-mechanisme. yes there one had also tolerances. Thats why K+F CONCEPT has very thick lens-locker most probabyl hardened. and past infinity. one can add shims to clear mirror. leitax seems to have those.
pity i could not yet see and test those novoflex and huppert-adapters.
Crazy they are showing wrongly built adapter:
http://www.ebay.com/itm/C-Y-CY-Contax-Yashica-Yashinon-Zeiss-lens-to-Canon-EOS-Mount-Adapter-/252284005370?
camera-adapter-locking-hole is at wrong position. its must be at 2 oclock. when red dot of camera-side is at 3oclock.
or at 11 oclock when red marker is at 12 oclock like on the image and not 9 oclock. WIERD!
ON LENS-SIDE(UPPER image)- hole must not go through but if going through it must be at about 130 oclock and not 3oclock.
I wonder why there are so much adapter-producting dilletants in asia. It seems a lot of idiots around.
_________________
mpa

europanorama · Joined: 27 May 2012 Posts: 128

calvin83 · Joined: 12 Apr 2009 Posts: 7581 Location: Hong Kong

I have corrected the link of the K&F adapter Click here to see on Ebay.

The reason why Yeenon align the lens to the 10-o-clock is to prevent the interference between the aperture coupling pin of certain lenses with the mirror box of FF EOS camera such as 5D, 5D2 and some of the 1D series. This is also mentioned on RAYQUAL's product page http://homepage2.nifty.com/rayqual/cy_eos.html .

About the tolerance things:
The flange distance the CY mount is 45.5mm while the flange distance of the EOS mount is 44mm. Theoretically, an adapter with thickness of exactly 1.5mm is required if we need perfect infinity. To ensure the lens focus to infinity exactly or near exactly at the infinity mark, we need to consider not only the difference in flange focal distance(the thickness of the adapter) but also the tolerance of the lens (assuming your EOS camera has the flange distance of exactly 44.00mm).

Assume the thickness of the adapter and the flange focal distance of the lens are made with a tolerance of +-0.02mm, the new tolerance of the lens adapter combo will become +-0.04mm. If the the new flange distance is -0.04mm, you will achieve infinity on most lenses but the focus scale will be off. If the the new flange distance is +0.04mm, you might get infinity on the telephotos but not the wide-angles. If the new flange distance is keep within +-0.02mm, the combo should works well on most lenses(the infinity mark may be slightly off though).

In practice, you need to match the adapter with your lens if you want the lens focus to infinity at the exact infinity mark. Adapters with the correct thickness should works well on most lenses but the thin one might come in handy with certain wide-angles. You can adjust your lens too but it may not be a good idea on zoom lenses or lenses with floating element.

europanorama · Joined: 27 May 2012 Posts: 128

Yes thats the seller but i have now also found the producer. name was hardly visible on package. had to backlit it...
www.kenfaith.com = K+F CONCEPT.

Maybe its worth getting the Yeenon. I am in contact with them.

europanorama · Joined: 27 May 2012 Posts: 128

Sigma 28/1.8 was worst on this already mentioned adapter: Will send them all back. Just boughit it again, 6 pieces before knowing the results.....
ebay #371148184919
cenyonline
elec-mall
(ecamcity)
yes the lens itself is decalibrated. together with this adapter which could have mirror-clearance i am getting sharp images at 9m lens set to infinity.
zeiss 85/2.8 seems to be ok at least at 350m.

also yashica ML 50/1.7 is affected. PC-Distagon 35/2.8. and 18/4 all AE. have no MMs.
--------------------------------------------------------------------------------
Can now compare with DSLREXCHANGE which has mirror-clearance.
Which Canon-FFs are affected?
Update:
very surprisingly 85/2.8 sharp at infinity or at least at 350m
totally sharp sigma 28/1.8. i am very surprised.
are my four dslrexchange-adapters really clearing mirror? must ask jorge torralba.

europanorama · Joined: 27 May 2012 Posts: 128

europanorama · Joined: 27 May 2012 Posts: 128

The three adapters i mentioned have this size-thickness. need a micrometer to measure it more precisely since my
digital caliper cannot measure directly when there is a rim.

1. K+F Concept: 1.41mm with 0.05mm(0.01mm tolerance) shim is now 1.46mm
with rim
2. DSLRExchange: 1.54mm I think i cannot reach infinity at least with not all lenses. its built for mirrorclearing.
with rim
3. ElecMall : 1.57mm- No focus to infinity at all.
has no rim
Remember: The lenses are badly calibrated. i will love the day when i can check that on a SLR.
Does anyome know how to calibrate lenses-Zeiss contax/yashica. or the dam....d sigma with is totally decalibrated.

europanorama · Joined: 27 May 2012 Posts: 128

BIG REVISION
My critics against Elecmall are totally wrong. The problem lies in the fact that lenses can be badly calibrated. Did a new test by using zeiss which are best for infinity or past with adapters.

test made for 350m, infinity not reached. a bit before. real infinity 500m and more will be tested later.

Since K+F CONCEPT is clearly focussing PAST infinity to match all lenses i added shim 3x 0.05mm= 0.16mm(with tolerance) leading to 1. 55mm
Has Rim which has no effect on lens. but i dont yet have digital micrometer only digital caliper to be most precise.

DSLRExchange: 1.54mm

the same like above. Has Rim
Elecmall 1.56mm
No Rim

And: Yeenon which is clearing mirror is 1.45mm. must be checked since these 1.54 make sense.

maybe different position of the lens here allows these 1.45. very clever. Cannot test-dont have such FF-Dsrl(Eos 5D variants/6D)

calvin83 · Joined: 12 Apr 2009 Posts: 7581 Location: Hong Kong

I remember my measurement on the Yeenon is 1.47mm and my friend measure it 1.48mm back in 2011 . We used a cheap digital caliper so the reading may not be very accurate. Both value is pretty close to the theoretical value of 1.5mm.