As converters will multiply the effect of lack of resolution ( lens softness ) I had intended to do a comparison between 105mm AIS, the 105mm end of 28-105 Nikon zoom, and the 105mm setting on Stevies 28-200 Sigma, as my starter. Weather conditions here have not permitted that.
However I did spot a Hare in the field so did some comparisons using it.
The converter in use is Nikon TC201 2x and this is recommended for lenses of 200mm and below. Prime lenses used are Nikon 200mm f4 AIS and Nikon 400mm f5.6 AIS. These are all designs from the 1980's so are not a reflection of the current range in terms of performance.
I think this shows that although the TC201 is recommended for shorter focal lengths it gives a better performance on the 400.
Images attatched.
1) Full frame at 200mm to put the exercise in perspective.
2) Composite of crops using 200mm, 400mm and 2x converter.
3) Composite of 400mm crops showing the effect of adding sharpening.
Don
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