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Color purity vs. resolution: Comparison of 5" ED-APO vs. 6" refractor side by side
Color purity versus resolution:
Comparison of the effect of a 5" ED-APO with three lenses including FPL51-like glass (127mm, 952mm f/7.5) and a 6" refractor (152mm, 1200mm f/8) with "color aberration" on a church clock.