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Forums
Physics
Classical Physics
Optics
Lens angle of coverage/image circle
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[QUOTE="Andy Resnick, post: 6646792, member: 20368"] The field of view and image circle diameter are related through the focal length, so keeping the focal length constant gives a trade-off between image circle diameter and angular field of view. I think the only option is the scale the diameter of the optic. Consider this lens (an extreme example): [URL]https://www.badgergraphic.com/index.php?route=product/product&product_id=4315&tag=Schneider+Fine+Art+Lens+XXL+1100mm%2F22.0[/URL] The image circle is 1 meter in diameter, the field of view is 45 degrees: for large-format photography, this lens is a 'normal lens'. If we keep the same focal length (1100mm) and look for a 35mm lens with those same specs, the field of view is much smaller (a couple of degrees or so). The 35mm lens also has a much smaller diameter (at f-stops identical to the XXL lens). I suggest examining the design differences between a tilt-shift lens designed for 35mm format photography and a fixed lens with the same focal length as the tilt-shift lens. Tilt-shift lenses have image circles larger than fixed lenses to accommodate the movements, so you can see what is required. [/QUOTE]
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Forums
Physics
Classical Physics
Optics
Lens angle of coverage/image circle
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