Originally posted by mrechte Again thanks a lot for this useful information.
As I am obviously dealing with experimented people, could you recommend lenses for such camera with minimum 300mm focal and f4 aperture ?
There are many choices in that range.
Currently available would be:
Pentax DA 300/4
Sigma 100-300/4
Sigma/Tamron 70-200/2.8 + 1.4x tc
Sigma 300/2.8
Secondhand
Pentax A* 300/4
Pentax SMC-K 300/4 (the cheapest, but quite good in many respects)
Pentax A/FA 300/2.8
Pentax A/FA 400/2.8
Pentax FA 600/4
Tamron 400/4
THen there are a few lenses which ly just outside your specs, namely those with a f/4.5 fastest aperture, like the F/FA 300/4.5 or the old SMC-K 500/4.5 or the Sigma AF 500/4.5, all of which are also worth considering.
Ben
There are also some 67 and 645 lenses with these specs, for instance the 800/4 67 lens - but you need a gun pod carriage to use that.