Thank you!
I am new to this forum and still learning it
I am very pleased with both the PENTAX bodies who've used .. and the Sigma 150-500. I think for professional use this system is more than adequate.I have photographed all systems and lenses, and certainly what I get from my system enough for me.
I do not think I need to change 150-500 with 50-500. I just want to see how fast its focus from edge to edge. I have used Sigma 50-500 Nikon observations but I what about PENTAX K-5. I prefer the slow tricks for super fast.
Whether PENTAX enough for shooting birds with Sigma 150-500 lens?
this is a result which could not achieve even 1DMk4 and 100-400
http://www.pictureshack.us/images/4286IMGP8304web.jpg