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i will be using a 5D so the entire CCD chip will be used hence my question if the OAG mirror interferes. Maybe i was thinking too deep about it with regards to the "f" ratio. i have just graduated from a pentax "ist" which does not use the whole CCD. after seeing the image above it seems to not affect the image but does the 450D use all of the available CCD. The main reason is that i am really close to the maximum weight for the mount, being piggybacked ( it has been like that for a while) i am starting to notice some unusual vibrations in the subs. maybe a slight tune up is required, but if it has done it once it will do it again.
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