Len, I do have it, but not at hand... It's for round or rectangular hood. It takes into account the diameter of the filter ring, the distance between the glass and the end of the hood, the diameter of the hood (or both diameters for rectangular hoods), and the focal lenght of the lens. I should be able to find it in some reference book at home tonight. It may be from the book Elements of Photography by Paul Boucher.
Andre >Is there a formula for calculating the maximum depth of the hood, given the >focal length of a lens in millimeters, it's maximum aperture diameter also >in millimeters, and the diameter of the hood in millimeters? > >If there is, it would make it a lot easier to find the optimum hood for any >given lens. I guess that it could be figured out graphically using the >angle of view of a lens, as well but, rather than reinventing the wheel, >perhaps someone already has the formulae at hand. > >Len >--- >- >This message is from the Pentax-Discuss Mail List. To unsubscribe, >go to http://www.pdml.net and follow the directions. Don't forget to >visit the Pentax Users' Gallery at http://pug.komkon.org . -- - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
