Originally posted by derekkite The scope/tele comparison is fascinating. So if this 560 is very sharp in the center, dropping off towards the edges which is mostly cropped by the sensor, and is in the $2K range, I think there will be buyers. Birders expect to crop; a sharp center on this long a lens allows you to stay far enough away from the subject to not be noticed yet get something clear. A focus limiter makes it very appealing. Now to find out the focus mechanism. If they have something that is reasonably fast, they will have a winner.
An anecdote. I was out with my gear and ran into a fellow who was interested. We chatted, he was from Calgary and visiting the Kootenays. He said all the guys he works with spend their weekends photographing birds. This is a growing market.
I assume that most bird photographers would do some cropping, albeit minimal.
For my part, I do very frequently crop my bird shots taken with the DA*300/4 + K5 because I am lacking a bit more focal length. I wish I had this 560mm reach.
Even with a 560mm, I would still "assume" that I would be doing some cropping - unless the bird is originally filling the frame.
A sharp center with "croppable" softer edges would not affect the overall IQ of the image that much, if at all.
JP