03-09-2013 06:50 PM
Going by your image, it appears that the mirror is hitting the back of the lens (probably the aperture lever) and you photographed the backside of the mirror as it was moving up. Although most older manual focus Pentax lenses (along with other manufactures) can be used with Canon crop bodies without issues, the full frame bodies, with their larger mirrors, can present a problem with some lenses.
Here is a lens compatibility chart for the older 5D, but it is probable the same or close with the mark III also.
If you really want to use this lens on your body, the aperture lever could be cut or ground down so that it clears clear the 5D mirror, or you could shave your camera's mirror.
03-11-2013 10:36 AM
Although the photos are nice, they are not anything a new EF lens can't do, so am I to assume the reasoning is simply cost?
I know it is/was for me as I have a pretty big collectiion of FD lens'. I would love to use but all efforts have failed to exceed what new EF lens' can do.
03-11-2013 11:39 AM
Cool, thanks for all the suggestions guys. I think I'm going to try removing that tab, since I think you're right that the camera would take photos just fine except for the mirror getting hit. The reason for wanting to use these lenses (the pictured one is a 50mm and I also have a 150mmZoom and a 28mm and a 2X teleconverter) is really to experiment and see what I can get out of them. Seeing that I have them I'd like to use them rather than going to something new.
03-16-2013 01:47 AM - edited 03-16-2013 01:48 AM
Well, everything seems to be working fine, nothing a hack saw and a file won't fix. Here are a few test images from some co-operative co-workers. Manual focus takes a little getting used to. Each of these shots are uncorrected, straight out of the camera.
03-16-2013 05:53 PM - edited 03-16-2013 10:16 PM
03-17-2013 03:26 PM
While it is certainly best to never let it happen, the mirror is a lot tougher than people think. The mirror on my 5DII has hit numerous times on multiple lenses without any ill-effects.
Question for ebiggs1. Did the adapter that you used for the FD mount lenses have corrective glass (for achieving infinity focus)? That would explain why the quality was so bad.
03-18-2013 10:45 AM
Yes the two I have, have a corrector lens and 'yes' they are quite horrible.
The Jakub Mika adapter is interesting and I am considering buying one. I have one FD lens in particular that I would love to use. It is a 600mm f4.5. It was/is a fantastic lens, in the day anyway.
I am a little hesitant to remove the aperture lever but really why not? I will never use it again on my F1n?
I have tried to use the F1n and scan the negatives or slide into CS6. I have had mixed results. Concerns are the extra work involved and the extra expense of a quality scanner. Not to mention film and processing.
After a print is made or viewed on a monitor, however, this process makes it pretty difficult to tell which is which. See for yourselves.
One photo is taken with a F1n and a FD lens. The other is a new Canon DSLR with an "L" lens.
03-18-2013 10:50 AM - edited 03-19-2013 10:26 AM
Hard isn't it?
I am not telling which is which so you must decide for your selves. I have shown this comparison to many people and around half to a little more get it correct. Maybe they are guessing?