Thom 16-85VR and 18-105 DX review is up

Started Feb 16, 2009 | Discussions thread
mosswings Veteran Member • Posts: 9,147
Focal Length Change with Focus Distance

This focal length change with focus distance is sort of like the old CAFE
mileage standards - you got 31mpg ONLY on the highway, and ONLY at 59F

and ONLY if you had the air conditioning and all accessories off. It also is not something published by the manufacturers. How difficult is it to generate a
chart of actual focal length vs. indicated focal length vs. focal distance?

Now I wonder if one of the advantages of pro glass is freedom from this effect...of course, it probably doesn't matter that much for many subjects.

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jfk
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