Largest physical aperture lens that focuses to 0.5m

by James   Last Updated November 08, 2017 02:18 AM

I have an application where I need as large a physical aperture as possible. By physical, I mean actual aperture in mm, not as an f-number. I also need this lens to focus to about 0.5m. I have the 85mm Nikkor f/1.4, which has a diameter of about 60mm, but doesn't focus close enough for me. Sigma have a 180mm f/2.8 macro which should be about 64mm diameter. Is there anything commercially available that is larger?

Answers 1

Astronomy is where large aperture "lenses" are commonly used. Look for "refracting telescope". There are two types: achromatic (not very good for photography) and "APO" or apochromatic (preferred choice but more expensive). The catch is: no AF, not designed for close focusing so the performance may suffer, much darker (f/6, f/7, f/8)

November 08, 2017 01:54 AM

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