I am going to be using a Toyo 4x5 camera with a 6x7 roll film back and I'm wonde ring how to figure out the approximate 35mm lens equivalents so I can estimate t he coverage angles. I am assuming that the usual 4x5 lens calculations with the smaller 6x7 film size will be off and I will need longer lens. I'm looking for t he equivalent of a 28mm wide angle in 35mm. In 4x5 format that would be about a 90mm lens, but I'm assuming that I will need something longer to get the same co verage in the 6x7 film format.
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