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Up to four at a time, prices for United States.

Sony FE 40mm F2.5 G ✕Viltrox AF 40mm F2.5 Air ✕
Sony FE 40mm F2.5 G
Sony FE 40mm F2.5 G
Viltrox AF 40mm F2.5 Air
Viltrox AF 40mm F2.5 Air
Lowest price today

$686 new

$529 used

$168 new

Optics
Focal length40mm40mm
35mm equivalent40mm (full frame)40mm (full frame)
Maximum apertureLower f-number lets in more light. A zoom wins only when it is as bright at both ends.f/2.5f/2.5
Minimum aperturef/22f/16
Made forFull frameFull frame
Elements / groups9 / 910 / 6
Aperture blades77
Closest focus0.25 m (best)0.34 m
Max magnification0.23× (best)0.14×
Focus & handling
AutofocusYes (Linear)Yes (STM)
Optical stabilisationNoNo
Weather sealedYes (best)No
Internal zoom——
Aperture ringYes (best)No
Teleconverter compatibleNoNo
Size & weight
Weight173 g (best)180 g
Diameter × length68 × 45 mm68 × 55.9 mm
Filter thread49 mm52 mm

Green marks the better figure where “better” is unambiguous. A dash means the maker doesn't publish it or we haven't verified it yet.