During the past few years, Nikon has been slowly replacing its highend super telephoto lenses with newer technology using lightweight fluorite lens
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Buy Canon EF 600mm f/4L IS II USM Lens featuring EFMount Lens/FullFrame Format, Aperture Range: f/4 to f/32 Two Fluorite Four Aspherical Elements. Review Canon
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Currently, my only objections to the short f/ratios becoming common are that the depth of focus is very short, making focus variability in mediocre seeing a bit more of a problem than in longer f/ratios, and that most eyepieces don't perform as well at the edges at f/3 as they do at f/5, even when both are Paracorred with the latest Paracorr ...