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Carl Zeiss ZF.2 135mm f/2 APO-Sonnar T*
Carl Zeiss ZF.2 135mm f/2 APO-Sonnar T*

Using ƒ/4 vs ƒ/2 for Isolation: City Binoculars (D800E)

Here the results at ƒ/2 are compared to ƒ/4, showing a high-grade result at ƒ/2 along with a superlative result at ƒ/4.

City Binoculars

Live View was used to focus precisely at ƒ/2 on the indented metal just under the “eyes”. The camera tilted down slightly.

The overall characteristics involve vignetting and depth of field. Except at high resolution, sharpness is apparently not a lot different at ƒ/2 than at ƒ/4, but see the crops: ƒ/2 is already at a high level, but ƒ/4 is superb.

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