Quote:
Originally Posted by Merlin66
The position of the sensor inside the camera can be moved.
The sensor position is therefore set to match the optical length including the built-in filters.
When the Canon is modified ie removal of filters (either one or both) requires the position of the sensor to be changed or additional filters re-installed.
This is well known and documented on the web.
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Thanks Ken. Just for the avoidance of doubt, I'm not looking at modifying a DSLR. My intent is to look at the correct set back distance for an EOS lens when it is not being used on its 'native' DSLR body. Having said that, I believe your observation confirms my hypothesis that the glass in the filters in front of the sensors affect the optical length between the lens and the sensor. The big question is, how much does it push back the set back distance.
Cheers,
Rodney