How do I compute the bellows extension required for infinity to 10 ft focus points for a 300 and 360mm lens respectively? I'd like to get one of these lenses for longer distance scenic photos and very close portraits (frame filled almost entirely by just the face).
I think my Sinar F2 4x5 will handle the infinity focus for both of these lenses, but I'm concerned I have enough bellows for closer photography focus.
The lens charts posted on the large format site show image circle sizes, but they don't indicate required bellows lengths for focus.
It would seem that this shouldn't vary between cameras and it would be specific to a focal length. Will the amount of extensions vary between lenses of equivalent focal length?
- Vince
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