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Old 23rd November 2018
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Loup Garou Loup Garou is offline
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Lenses: relative length & diameter

I am no expert in the physics involved in lens-making but always thought that with same-fit lenses having the same max apertures, the lens with a longer focal length would be longer and larger than the other one. If that is the case, how is it that the Sigma 56mm f1.4 DC DN is significantly shorter than the Sigma 30mm f1.4 DC DN (which I own and do NOT think is too big like some people do)?
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