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Re: And a better way to look at it…
In reply to Samuel Dilworth,
3 months ago
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Samuel Dilworth wrote:
Leonard Shepherd wrote:
I disagree. The only lenses which you do not gain or lose some exposure relative to the marked aperture in the Nikon line up are the 50mm f1.8's and the 85 mm PC.
(snipped). None of these explain the differences noticed by the thread-starter, which are caused by:
Ignoring which prime, the 200 mm macro, the 200 mm F2 and either aperture current 70-200 have different optical constructions, different effective apertures at minimum focus and different minimum focus distances.
Variations in the different lens designs is to be expected. In the context of this thread the 200 mm f4 macro "breathes" a lot being effective 125mm f2.5 (compared to a theoretical symmetrical lens design) by 1:1 magnification.
--
Leonard Shepherd
Many problems turn out to be a lack of intimate knowledge of complex modern camera equipment.
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