Arianne Dubois wrote:
You cannot use the 28/2.0 Dist on a 5D without mirror surgery.
I use a 28mm f2 on my 5D and have never had any issues with mirror clearance, though maybe I struck lucky with the 5D because no other lenses have had any problems either.
The tolerances with 5D mirror boxes must be somehow enormous.
At least bigger than what I would suppose to be reasonable for optical equipment.
I saw Tessar 45mm's getting stuck on one and working well on other 5D's.
It was a question of 1/100 mm.
But with our copy of the 28/2.0 (late AE) and two different non-shaved 5D's it is obviously a question of something closer to 1 mm! And - as I stated - it completely blocks the shutter (that has to be pushed again to release the mirror in its closed position) up until you turn back midway between infinity and 2m, which is a lot.
The Distagon 28/2.0 has an asymmetrical ring on the back with a kind of cutaway for the mirror radius. We saw some 28/2.0 where this ring was not centered and properly aligned with the mirror movement. This should be fixed anyway, but it did not help to clear our unshaped 5D's.
If I manage to put together or 28mm findings in a nice way I will post it in separate thread and will tell you here. Stay tuned. Our results were in one aspect absolutely surprising. Even shocking, I would dare to say.
Edited by Arianne Dubois on May 15, 2007 at 10:44 PM GMT
Sorry no, we do not have the 25mm f2.8 ZF yet, but are curious to compare it with the CY 25mm f2.8 MM. The construction is completely different. 10/8 to 8/7.
But: The 35mm ZF displayed the highest resolution we have ever tested with Canon FF DSL's.
(Exept one, but at a different focal length: the Apo-Rodagon N 80mm f4 in a Zörkendörfer triple helical mount. It's a secret. Keep it to yourself.)
