Well I was supposed to be accumulating some £££ for a new body, but then I spotted this.
This lens has such a great reputation that I wanted to check it out. It wasn't cheap but it seemed worth the money. And in the event I was able to get this KS2 body as well.
The sigma 100-300 F4 apo proved to be in excellent condition with a very good case and quality filter. But my test pics cast a cloud: the iq at 300mm f4 seems to be a bit off.
No problem at the shorter focal lengths (see some crops
here). I disccussed this with the seller who wasn't any help, asked a second opinion at Cambrian Cameras (dismissive - film era lens what do you expect..) and tried an AF fine tune. Even at -10 the lens still seemed to be front focusing. But more pics from the feeders at the Spinnies weren't so bad. KS2, f8-f11.
Had to move fast to catch the water rail before it scurried back into the bushes.
This was mere luck.
I think it is what it is: soft at f4, so-so at f5.6, good at f8+. Doesn't like tc's - I wasn't happy with results with the pentax DA 1.4x. AF mostly hits the spot. I would be interested to hear from other users of this lens how this compares.
But I like the KS2, very nice camera.