I think you need the angle of view more than field of view. the formula for AOV is
AOF = 2*tan^(-1)/(F/2*f) where F is the size of the sensor f is the focal length. You'll have to use some algebra to rearrange the terms to solve for "f". I'm just feeling too lazy... Shel Belinkoff wrote: > There is a photo I'd like to make, but the widest lens I have is still too > long as it forces me to include an undesirable object in the frame and I > don't want to mess around with cloning the object out of the scene. I will > need to borrow a wider lens, but I don't know what focal length would work. > Is there a way to determine the focal length I need based on the subject > distance and framing I want using the longer lens. I know how close I must > get to the subject to eliminate the unwanted element. Perhaps a formula of > some sort? > > For what it's worth, the subject is about 12-feet long and I have to get > about six feet from it. > > > Shel > > > > > -- Things should be made as simple as possible -- but no simpler. --Albert Einstein -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net