What's the max operational aperture of Sigma 180 2.8 APO Macro? Camera Lens Astrophotography · Liu Zhuokai · ... · 1 · 104 · 0

rarahaha2 0.00
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Having seen some excellent work done by Weihao Wang with this lens, I bought one recently. But I don't know the max operational/available aperture of this lens. Please tell me if you have known the answer, thanks.
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grsotnas 4.82
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Camera lenses state the max. aperture (photographic term. Not the actual diameter. Best named focal ratio) in their "full name"

Therefore, the Sigma 180mm f2.8 will have a maximum focal ratio of f/2.8

If you want the lineear aperture diameter you calculate: D = FL/f = 180/2.8 = 64mm
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