Sigma 50-500mm f/4-5.6 APO DG
Is there much difference, optics-wise, between this lens and the later HSM ones?
Yes, the newer HSM OS version is a good deal sharper wide open. Personally I wouldn't touch this one unless you really must have 500mm but don't have the funds for either the 150-500mm or 50-500mm OS.
pentax da*50-135 pentax da*60-250 sigma af 400mm pentax 1.7 af adapter
Pentax af aw 1.4 rear converter and a flash
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863 posts
11 years
Somewhere safe in deepest Lancashire.
https://www.lcegroup.co.uk/Used/Sigma-50-500mm-f/4-5.6-APO-DG_359399.html
(Compulsive Obsessive Lens Buying Addiction Syndrome)
What you need are lenses, more lenses, bigger lenses, better lenses, faster lenses, vintage lenses and when you have these, your pictures will be perfect!