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Originally Posted by navin  I am not into birding but a fast tele will help with school sports and the occasional trip to a sanctuary or a zoo (not the Mumbai zoo).
of the lot you have listed above the f2.8 tamron or sigma look very interesting as does the 50-500! any idea of the prices on these lenses?
the pentax 50-135 is not long enough and $1000 to boot. |
The Sigma 50-500, aptly called as the BIGMA, retails for around $1000.
The other two are expected in the same price bracket too. (but still unavailable).
Check out the pentax lens roadmap here:
http://www.digital.pentax.co.jp/en/lens/roadmap.pdf