I have been looking for a 210mm lens to cover 500mm diagonal for some time. Does anyone know of any 210mm lenses that would work on my 30x40cm camera at infinity? I am aware of the 210mm sa and the 200mm grandagon but these lenses are very expensive and while I shoot wide angle almost all the time the 210 would be used less than my standard 300mm lens. Are there any reasonable 210mm lenses that would cover the 30x40cm? What about the computar 210? Ive tried almost every other 210mm process lens thats come my way and nothing had covered yet. I have a 200mm Russian metrogon that just misses as does the wollensak 10x12 extreme wide angle 200mm lens. I believe Ive hit a brick wall here but there certainly is the possibility that Ive overlooked some lens? Can anyone shed any light on a 210 that would cover 500mm other than the 210 sa and the 210 grando? Thanks for taking the time to read this.