Depth of field question

Started Dec 22, 2012 | Discussions thread
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Leonard Shepherd
Leonard Shepherd Forum Pro • Posts: 10,779
Re: To help clarify

Leon Obers wrote:

To help clarify a theoretical 105mm lens of symmetrical design at 1:1 focus has the angle of view of a 210mm lens at infinity focus; and transmits two stops less lights than when focused at infinity.

The Nikon 105mm f2.8 macro D is not symmetrical at 1:1, and changes to an equivalent 78.5mm f2.1. It transmits only one stop less light compared to 2 stops less with a theoretical symmetrical lens.

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Leonard Shepherd
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