quality of sigma 170-500?

[Frank Wajer]

Hi,

has anyone tried the Sigma 170-500 zoom. How is it's quality compared
to the fixed 300 f4 or 400 f5.6 Pentax lenses.
I'm considering getting an ultra-telelens but I'm not sure what will be
the most versatile focal length. 170-500 zoom would therefore be great.


Frank

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