Hi to All,
Can any one help me in finding that what will be the back focal length (BFL) of a zoom lens of 400mm focal length? By BFL I mean the distance from last surface of lens to senor/image plane distance. And what will be the zoom lens size possible? Actually my concern is how big will be my total system. I want to get 2 degree to 8 degree FOV, the sensor size is 13mmX13mm. The focal length for 2degree FOV will be around 400mm. For such a lens of 400mm focal length what will be the BFL? I think they call BFL as Flange Focal Length (FFL) in optics terms. How these two are related? Is there any definite relation between the two? How much least BFL we can acheive for 400mm focal length zoom lens? All these are my queries...puzzling my mind...
thanks and regards,
raghav
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