Re: How and why to use close-up lenses on large format cameras
Quote:
Originally Posted by
Drew Wiley
Some enlarger lenses work well. Although they're rare, Schneider once offered Componons in shutter for close-range use, even though they're normally associated with enlarging.
I have some of these beastlets (75 mm in #00, 105 mm in #0) and equivalents from D.O.I. (105 mm in #0). All came from mug shot cameras. I bought 'em for the shutters. One was even in a cock and shoot #0. Who'd a thunk it?
Re: How and why to use close-up lenses on large format cameras
Quote:
Originally Posted by
xkaes
Wouldn't it be nice to have a formula to know, at least approximately, how much a given diopter would reduce the image circle, such as NEW IC = OLD IC / (DIOPTER X ?).
Try this formula: (New focal length/Old focal length) X Old image circle = New image circle. Do check the mathematics to see if the approximation is good enough for you. What would suggest for a more exact calculation?
"New focal length" in the above formula is the result of adding a supplementary lens (positive or negative dioptre) to the original "Old focal length " lens.
Re: How and why to use close-up lenses on large format cameras
Too late to edit. Mental lapse. My beastlets (see post # 31 above) are Comparons, not Componons. Oops!
Re: How and why to use close-up lenses on large format cameras
Quote:
Originally Posted by
xkaes
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