The taller the column, the better the lens performance. For this review, the lens was tested on a Canon EOS 5DS R using ... lenses have special lens elements (aspheric, extra-low dispersion ...
Flare is one area where diffractive elements could have a negative effect, but by facing the diffraction gratings against each other, Canon seems ... have special lens elements (aspheric, extra ...
Digital Camera World on MSN23d
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