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Message: <blockquote data-quote="Bengt Nyman" data-source="post: 471792" data-attributes="member: 13692">There is definitely a hole in the market for every day birding. It will be interesting to see if Sigma or Tamron decides to offer us a reasonable 600mm prime, or if smaller format mirrorless cameras with the correspondingly shorter primes get there first.P.S. A tip for fine focusing. I use a high resolution monitor showing an empty spreadsheet where I set row height and column width to very small numbers creating a fine line pattern. Now select a square in the middle and use the border command to darken all borders within the selected square. Depending on the focal length of the lens this gives me better visual comparison than most other targets.</blockquote>