Quote:
Originally Posted by Eldest_Sibling
Granted, this case does seem to differ, and I couldn't find an article by "Alchemy" online. Is "Alchemy" an individual, or a publication? Did the OP use a focal-reducer of some sort, or did they have the primary-mirror re-figured? I doubt the latter.
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This is the bit I’m interested in. Moving the focal point I get and is pretty straightforward. It’s the change of focal ratio I’m confused about ( as a simple DIY at least ) and also going from f/5 to f/4.6 is a shortening of the focal length which would only exacerbate the difficulty in achieving DSLR focus.