Samuli Vahonen
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 p.2 #19 · Canon 5D MKII and Live View | |
Cableaddict wrote:
SOME CLARIFICATION PLEASE:
1: Does the problem happen when in live-view MODE, or only when the live-view LCD is on?
What is live view mode? Either you use live view or don't use - when you do use live view, then image is displayed in LCD and then this happens, there is no half way live view mode that live view is on and LCD is not connected unless you use external monitor via cables, that I haven't tested...and will not. It won't happen if you are not using live view.
Cableaddict wrote:
2: Is this being discussed elsewhere, is it a confirmed problem?
I haven't checked the manual focus forum, but that is about the only place in addition to this forum in which alternative lenses are discussed. Another usage without electronical connection between lens and body is astrophotography (T-mount to telescopes), in which I doubt that higher shutter speeds than 1/2000s are used...
Cableaddict wrote:
3: If confirmed, is it a defect, found on on some cameras? (i.e. a recall problem)
The number of testers in this thread is too small to clearly identify this. Based on how the few testers, who have purchased 5DmkII at different times from different continents, in this thread have so similar symptoms that there is no reason to thing this is camera/batch specific.
This definetly ain't causing recall, why Canon would care people not using their own lenses? And as can be seen from images with chip, Canon lens, slow enough shutter speed or simply live view not used there is no strange vignetting. This is a software problem, when no electronical connection then something goes wrong.
Cableaddict wrote:
4: Has it been confirmed that chipped adapters solve the problem, 100% ?
At least happypagehk and non-brand ebay adapters do work. Canon lens works the same way if you turn it in the mount so it doesn't have electronical connection. 100% sure, wait 5 years and I'll tell you...
Cableaddict wrote:
5: Is a specific type of chip required?
I have tested with happypagehk (10+ adapters to C/Y, Nikon, Leica) and nobrand eBay chipped cheap adapters. To me it seems that there is no difference between chips, but for statistical analysis the sample is too small.
Cableaddict wrote:
In other words, is focus-confirm enough, or does it require maximum aperture exif data? I ask because my chips can't always be programmed for the exact max aperture. (I use the programmable type)
- And if aperture data is required, what happens when you stop down a little?
- If focus-confirm is all that's required, what happens if you purposely have the center of the shot OOF?
Only thing needed is that camera things that there is electronically connected lens in the camera. This has nothing to do with the values provided by the chip or autofocus system of the camera.
It's really missleading to call these chips focus confirm chips, what the heck could be more missleading, the chip doesn't tell if the focus is achieved or not. The chips are simply providing electronical communication to camera, part of the information is EXIF relevant. This electronical communication information is used by camera, for example Canon cameras won't enable the AF system unless lens communicates aperture value to camera.
Some of the adapters I also have wrong max value, for example Zeiss Planar 1.7/50 is coded to 1.8 and Zeiss 3.4/35-70 had to be coded to 3.5, since it's not possible to send 1.8 or 3.5 from lens to camera.
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Samuli Vahonen
http://www.vahonen.com
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