EXCERPT page containing first few paragraphs. 2021-10-21 01:33:15
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This is a rigorous (very demanding) test at infinity focus at 300mm. It confirms the symmetry issue seen with many other field images.
Atmospheric haze was a factor here through many miles of air; contrast was added via a tonal curve in order to compensate.
The lens was on a tripod, and zoomed to 300mm, optical stabilization disabled as it ought to be on a tripod. A remote release was used along with vibration-free Canon Mode II Live View exposure.
Shutter speeds ranged from 1/1000 second at f/2.8 to 1/160 second at f/11. Although care was taken, there is always some risk of movement at lower shutter speeds.
White Mountain Peak, 14,252' elevation
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