06-22-2010, 03:49 AM
[quote name='wim' date='20 June 2010 - 09:51 PM' timestamp='1277034701' post='625']
There actually are multiple shims for the focusing screen, in several thicknesses, for each camera body. Shims can be bought in sets of different thicknesses, so that the correct distances of focusing screen to lens can be set. This is not aprocedure for th efaint of heart, however, and is probably best left to a Canon Service Center for most of us.
HTH, kind regards, Wim
[/quote]
Hi Wim,
Yes, you're right. I actually meant to say multiple shims for each corner (like there is on the sensor mount?).
I got this IR modded 50D and VF is completely off. The AF works fine for most lenses (partly thanks to micro-adjust) but I want to shim the focusing screen properly to make it consistent with the sensor. I know this is a big can of worms because different lenses focus IR different points so there's no one right place to pick. But I have the 200 f/2 which needs no correction for IR (it's the most APO lens out of all the [url="http://forum.photozone.de/index.php?/user/10892-genotypewriter/page__tab__aboutme"]ones I've used[/url]) and I want to be able to MF through the VF on that because the AF "correction" done to ensure proper IR focusing for my other lenses is so heavy that not even full microadjust is enough to get the 200 to AF.
I know there are multiple shims in there but I've been too chicken to meddle around in case I break something. I've already changed the focusing screen to the S type but that's all. Any ideas on how to pull those shims out? (I might actually need to add instead of remove... can't remember the error).
Thanks...
There actually are multiple shims for the focusing screen, in several thicknesses, for each camera body. Shims can be bought in sets of different thicknesses, so that the correct distances of focusing screen to lens can be set. This is not aprocedure for th efaint of heart, however, and is probably best left to a Canon Service Center for most of us.
HTH, kind regards, Wim
[/quote]
Hi Wim,
Yes, you're right. I actually meant to say multiple shims for each corner (like there is on the sensor mount?).
I got this IR modded 50D and VF is completely off. The AF works fine for most lenses (partly thanks to micro-adjust) but I want to shim the focusing screen properly to make it consistent with the sensor. I know this is a big can of worms because different lenses focus IR different points so there's no one right place to pick. But I have the 200 f/2 which needs no correction for IR (it's the most APO lens out of all the [url="http://forum.photozone.de/index.php?/user/10892-genotypewriter/page__tab__aboutme"]ones I've used[/url]) and I want to be able to MF through the VF on that because the AF "correction" done to ensure proper IR focusing for my other lenses is so heavy that not even full microadjust is enough to get the 200 to AF.
I know there are multiple shims in there but I've been too chicken to meddle around in case I break something. I've already changed the focusing screen to the S type but that's all. Any ideas on how to pull those shims out? (I might actually need to add instead of remove... can't remember the error).
Thanks...