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<blockquote data-quote="Norske" data-source="post: 38126" data-attributes="member: 409">Canon lenses are fairly priced, but that doesn't make them affordable to me or justifiable for the amount I'd actually use one.&nbsp; Search out comparisons of Sigma and Tamron lenses.&nbsp; Both are much more affordable than Canon/Nikon/Pentax/Sony/Olympus, etc.&nbsp; Quality/$$ is better than the camera maker's stuff.Anything over 10X (500mm for a full-frame, 350mm for a APSC) requires a very good (strong and likely heavy) tripod.&nbsp; For sharp photos you may also have to be able to lift the camera's mirror before shooting to minimize vibration.&nbsp; Think more about a 150-600mm than what you mentioned.&nbsp; Even one of those from Sigma or Tamron will cost over $1,000.&nbsp; One last thing; the calculated lens speed or f-number of mirror lenses isn't realistic.&nbsp; I have a Tamron 500mm f8 that according to the shutter speed the camera picks (auto exposure, aperture priority) is actually f11.&nbsp; I will also use a spotting scope with a real bayonet camera mount in place of the normal eyepiece.&nbsp; Even with the mirror lifted shooting at that around 17X magnification requires a lot of luck for me to get a sharp image.</blockquote>

[QUOTE="Norske, post: 38126, member: 409"] Canon lenses are fairly priced, but that doesn't make them affordable to me or justifiable for the amount I'd actually use one. Search out comparisons of Sigma and Tamron lenses. Both are much more affordable than Canon/Nikon/Pentax/Sony/Olympus, etc. Quality/$$ is better than the camera maker's stuff. Anything over 10X (500mm for a full-frame, 350mm for a APSC) requires a very good (strong and likely heavy) tripod. For sharp photos you may also have to be able to lift the camera's mirror before shooting to minimize vibration. Think more about a 150-600mm than what you mentioned. Even one of those from Sigma or Tamron will cost over $1,000. One last thing; the calculated lens speed or f-number of mirror lenses isn't realistic. I have a Tamron 500mm f8 that according to the shutter speed the camera picks (auto exposure, aperture priority) is actually f11. I will also use a spotting scope with a real bayonet camera mount in place of the normal eyepiece. Even with the mirror lifted shooting at that around 17X magnification requires a lot of luck for me to get a sharp image. [/QUOTE]

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