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calvin83
Joined: 12 Apr 2009 Posts: 7560 Location: Hong Kong
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Posted: Tue Sep 21, 2010 6:21 pm Post subject: Canon EOS AF confirmation chip quick test |
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calvin83 wrote:
Setup:
Camera: Canon 350D, installed on a tripod with remote control
Lens A: Yashica 5cm F2 m42 with
AF1: Big_is cheap AF chip with focal length set to 100mm(EXIF:100mm) installed in Big_is m42->eos adaptor.
AF2: Oldest Optix chip with no aperture adjustment installed in a high quality m42->eos adaptor (EXIF:50mm).
Lens B: Rollei 50mm F1.8 HFT with
AF3: "No name" AF chip with a certain degree of micro-adjustment calibration(EXIF:35mm)
(The AF chip is sticked to the rollei conversion adaptor and I cannot take it apart)
The Big_is and old Optix chip does not support micro-adjustment calibration. The "No name" AF chip is calibrated before the test(I cannot assure it is well calibrated).
The distance of the camera to the test object is about 0.6 meters. All photos is shot at full open with a shutter speed of 1/100s.
The focus ring is turn slowly from MFD to 0.6 meters/ from Infinity to 0.6 meters until the AF confirm appears. Two photos is taken from each setup and the best/sharpest one is used.
All the phots is trimmed from 8MPs Raw file in Canon Digital Photo Professional to Jpeg with image quality=8. The EXIF data is maintained.
Test:
The AF point is as follows. I tried to maintain it for all the photos.(Update:The AF3 will always record the Centre AF )
Yashica 5cm @F2 + AF1 from MFD to 0.6 meters
Yashica 5cm @F2 + AF1 from Infinity to 0.6 meters
Yashica 5cm @F2 + AF2 from MFD to 0.6 meters
Yashica 5cm @F2 + AF2from Infinity to 0.6 meters
Rollei 50mm @F1.8 + AF3(calibrated) from MFD to 0.6 meters
Rollei 50mm @F1.8 + AF3(calibrated) Infinity MFD to 0.6 meters
Note:
1.This quick test is not done by a professional tester.
Time to sleep now. _________________ https://www.instagram.com/_lens_fever/
The best lens is the one you have with you.
Last edited by calvin83 on Wed Sep 22, 2010 4:49 am; edited 1 time in total |
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ManualFocus-G
Joined: 29 Dec 2008 Posts: 6622 Location: United Kingdom
Expire: 2014-11-24
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Posted: Tue Sep 21, 2010 7:44 pm Post subject: |
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ManualFocus-G wrote:
I would highly recommend anyone looking to get an EF->M42 adapter to get one with an EMF chip. It's only a few quid more and you can change all the settings including AF confirm micro adjustment _________________ Graham - Moderator
Shooter of choice: Fujifilm X-T20 with M42, PB and C/Y lenses
See my Flickr photos at http://www.flickr.com/photos/manualfocus-g |
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calvin83
Joined: 12 Apr 2009 Posts: 7560 Location: Hong Kong
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Posted: Wed Sep 22, 2010 4:52 am Post subject: |
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calvin83 wrote:
ManualFocus-G wrote: |
I would highly recommend anyone looking to get an EF->M42 adapter to get one with an EMF chip. It's only a few quid more and you can change all the settings including AF confirm micro adjustment |
One adaptor, one lens. _________________ https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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hexi
Joined: 01 Jul 2009 Posts: 1631 Location: France
Expire: 2011-11-18
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Posted: Wed Sep 22, 2010 8:16 am Post subject: |
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hexi wrote:
Since i can't setup ( i tried !!!!! ) the Contax EOS adapter i deal without focus confirm, and does not feel the urge to got it. As for M42 adapter it's without AF confirm, focusing is quite easy on the 5D _________________ Happy owner and user of :
SLR's > Contax Aria - RX
DSLR > Canon 5D
Lenses : C/Y Planar 1.4/50 - Distagon 2.8/35 - Planar 1.4/85
http://www.flickr.com/photos/sonnar85 |
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calvin83
Joined: 12 Apr 2009 Posts: 7560 Location: Hong Kong
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Posted: Wed Sep 22, 2010 6:36 pm Post subject: |
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calvin83 wrote:
hexi wrote: |
Since i can't setup ( i tried !!!!! ) the Contax EOS adapter i deal without focus confirm, and does not feel the urge to got it. As for M42 adapter it's without AF confirm, focusing is quite easy on the 5D |
The focusing screen of 5D is much larger thant these low end models.
The AF confirm works better when focus from infinity to the object distance in this test. Anyone have similar experience? _________________ https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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eeyore_nl
Joined: 09 Nov 2008 Posts: 837 Location: Netherlands
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Posted: Mon Jan 17, 2011 10:28 pm Post subject: |
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eeyore_nl wrote:
calvin83 wrote: |
The AF confirm works better when focus from infinity to the object distance in this test. Anyone have similar experience? |
Yes, that is my experience as well. _________________ Fujifilm X-Pro2 / Fujifilm X-T1 / some Sonnar & Takumar lenses |
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martinsmith99
Joined: 31 Aug 2008 Posts: 6950 Location: S Glos, UK
Expire: 2013-11-18
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Posted: Tue Jan 18, 2011 6:58 am Post subject: |
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martinsmith99 wrote:
The only thing I've found with AF chips & EOS cameras is they aren't worth the bother.
The problem I find is that there is such a range that it will confirm at. Mine are mainly BIG-IS chips. _________________ Casual attendance these days |
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eeyore_nl
Joined: 09 Nov 2008 Posts: 837 Location: Netherlands
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Posted: Tue Jan 18, 2011 1:47 pm Post subject: |
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eeyore_nl wrote:
martinsmith99 wrote: |
The only thing I've found with AF chips & EOS cameras is they aren't worth the bother.
The problem I find is that there is such a range that it will confirm at. Mine are mainly BIG-IS chips. |
I use the AF confirm adapter for quick focus, and my eye for fine tuning. One thing to remember is that the red square only gives an indication of "near focus". It is only when the green AF sign comes up in the viewfinder that the camera thinks focus is achieved. _________________ Fujifilm X-Pro2 / Fujifilm X-T1 / some Sonnar & Takumar lenses |
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calvin83
Joined: 12 Apr 2009 Posts: 7560 Location: Hong Kong
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Posted: Tue Jan 18, 2011 6:42 pm Post subject: |
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calvin83 wrote:
eeyore_nl wrote: |
martinsmith99 wrote: |
The only thing I've found with AF chips & EOS cameras is they aren't worth the bother.
The problem I find is that there is such a range that it will confirm at. Mine are mainly BIG-IS chips. |
I use the AF confirm adapter for quick focus, and my eye for fine tuning. One thing to remember is that the red square only gives an indication of "near focus". It is only when the green AF sign comes up in the viewfinder that the camera thinks focus is achieved. |
The same to me. _________________ https://www.instagram.com/_lens_fever/
The best lens is the one you have with you. |
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enzodm
Joined: 11 Sep 2010 Posts: 350 Location: Italy
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Posted: Wed Jan 19, 2011 1:12 pm Post subject: |
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enzodm wrote:
eeyore_nl wrote: |
calvin83 wrote: |
The AF confirm works better when focus from infinity to the object distance in this test. Anyone have similar experience? |
Yes, that is my experience as well. |
I did a quick test using a ruler and I found the same too. Going from close to the object I have backfocus, from infinity to the object focus is more centered. However, in this situation how an EMF chip could help? If I correct for backfocus, what occurs when focusing from infinity?
(I know the answer: since I just received an EMF adapter, I have to embark the long programming and try by myself ) _________________
Canon 60D, Tamron 17-50VC, Canon 55-250IS, Sigma 50-150/2.8 plus:
Wide: Mir 20/3.5, Kenlock 24/2.8, Tamron 28/2.5, Yashikor 35/2.8, Mir 37/2.8
Fifties: Voigtländer Color Ultron 50/1.8, Pentacon 50/1.8, Zenitar 50/1.9, Leica Summicron 50/2, CZJ Pancolar 50/2, CZJ Tessar 50/2.8, Industar 50/3.5 , Rikenon 55/1.4, Petri 55/1.8, Helios 58/2
In the middle: Cyclop 85/1.5, Nikon 100/2.8
135s: Tamron 135/2.5, CZJ Sonnar 135/3.5, Jupiter 135/3.5, CZJ Triotar 135/4, Tamron Twin Tele 135-225
Tele: Soligor 200/2.8, Pentax Super Takumar 200/4, Hanimex 400/6.3, Makinon 500/8
Various: Schneider-Kreuznach Componar 135/4.5, Tominon 105/4.5, Vest Pocket Kodak meniscus, Wray Supar 2"/4.5
Sony Nex 6 plus:
Industar 69 28/2.8, Fujian 35/1.7, Rokkor 50/1.4, Jupiter 50/2, Cosmicar 50/2.8, Industar-22 50/3.5, Leitz Elmar 90/4, Canon Serenar 100/4
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