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Dear Lea,
It isn't as much how far he can see, but how big the image of the subject will be. You can actually loo to infinity with your normal or wide-angle lens, albeit with no big success :) If You use the full-frame format, then 50 mm is considered "normal" (although human vision is sharp and adequate as if looking with 85 mm) So zoom 150 - 600 is magnification from 3 to 12 times. Using a spotting scope is totally different world comparing to using a camera. Both depend on the quality. Working scope of a birder / twitcher is usually either Leica or Swarowski with 20-60 x eyepiece (magnification) and front lens 60 or 80. This thing has crystal clear picture up to magnification maybe 45 or 50. Further usually the atmospheric hays starts to play tricks, especially in clear hot days. Of course this beast will cost several thousands. It is possible to have a pocket digicamera with its lens against the eyepiece or use a DSLR with a special piece to connect the camera in the place of the eyepiece. If the desire is to have a clear image of the central subject, the digiscoping will be ok, but if the need is for edge-to-edge sharp image, then the scope won't do the job. Usually the birds or game or butterflies or whatsoever (naked ladies) will be held in the middle of the frame, unless you are a hardcore composition nerd. Hope this helps, Peeter On 11.12.2014 21:08, Lea Murphy wrote: i have a tutoring client doing some lovely wildlife photography work. |
