Sigma 150-500mm DG APO IS - well you just have to, don't you?
Outer ring is normally caused by oversharpening, have noticed it a few timkes on my moon shots when I get a little heavy handed.
You're probably right Mike. I think I ran this one through Topaz, which may account for it.
Peter E Smith
My flickr Photostream
[i]Bodies: 1x K-5IIs, 2x K-5, Sony TX-5, Nokia 808
Lenses: Pentax DA 10-17mm ED(IF) Fish Eye, Pentax DA 14mm f/2.8, Sigma 17-70mm f/2.8, Pentax-A 28mm f/2.8, Sigma 30mm F1.4 EX DC, Pentax-A 50mm f/1.2, Pentax-A 50mm f/1.4, Pentax-FA 50mm f/1.4, Pentax-A 50mm f/1.7, Pentax DA* 50-135mm f/2.8, Sigma 135-400mm APO DG, and more ..
Flash: AF-540FGZ, Vivitar 283
Mannesty
Member
Totana, Spain.
Peter E Smith
My flickr Photostream