Originally posted by Lowell Goudge I would be extremely surprised if yo can get an f2.8 300mm anything for double your budget.
I bought my Tamron Adaptall 2 SP 300/2.8 from Keh for $450. A very good lens, highly recommendable. Of course, my Pentax F* 300/4.5 is sharper and it has autofocus too, but it's also 2x more expensive. And the Tamron is 1.5 stop faster, which counts a lot in low light or to shoot those magazine portraits with soft blurred backgrounds (the bokeh of the Pentax is not always that good). The Tamron is also the king of teleconverters. I get very good results with my Kenko 3X Teleplus Pro 300 converter (on a sturdy tripod): a whopping 900mm F/8 lens
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Here's a sample taken wide open with the Tamron 300/2.8 on my K10d (no sharpening):
100% crop from preceding picture:
Here's a sample taken wide open with the Tamron 300/2.8 + Pentax 2X-S Rear Converter (600/5.6 equivalent) on my K10d (no sharpening):
100% crop from preceding picture:
And here's a sample taken wide open with the Tamron 300/2.8 + Kenko 3X Teleplus Pro 300 converter (900mm F/8 equivalent) on my K10d (no sharpening):
100% crop from preceding picture:
Cheers!
Abbazz