Originally posted by Shanti I also have the DA*300 / Pentax AF 1.7TC, K5II, and in certain conditions it works perfect,and no loss of quality..you have to have exposure spot on,and maybe use MF at times.. I find that for long shots of birds/wildlife haze or whatever can affect quality alot. But also AF is faster I feel with the TC on,for BIF for example.But it takes time to learn this lens and a monpod or tripod is needed alot of times..but I get clear shots in a hurricanw winds of 35m sec with a monopod..so all is possible....
I agree Shanti, you do generally need to use a tripod with a 1.7 converter on, though I have taken flight shots of an Osprey at 1/500 handheld which came out ok, the shake reduction system does help. Most of my best shots are taken using hides, whether at a nature reserve or at private location.
I am actually having problems with the AF on my 300mm DA - ie not working since last week ! Though I normally use MF anyway as I have missed shots when using the AF.