Quote:
Originally Posted by luigi
Ty Peter. I was curious about a comparison between the 400 F5.6 vs a 400mm refractor and the adapter was a good way to compare.
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Yes, 400mm FL refractor will always be better as telescope (visual).
All those lense elements that are present in telephotos are mainly to achieve the focal plane flatness (because the sensor/film is flat) and to deal with other aberrations that are much more pronounced in the corners of the frame.