Currently have a Pentax K10D and looking to either change out completely to Nikon or Canon or stay with Pentax (only have the kit lens and a Tamron 70-200?). I am looking to do motorsport and nature, especially after a recent trip to the Isle of Mull. The Pentax is limited in the lens area. Just been reading about the Pentax DA*300mm (or even the DA* 200m and maybe a teleconvertor) and Sigma 150-500 and wondered if either if these would be enough to keep me with Pentax. Reviews seem to be varied and hence the reason for considering Nikon/Canon as there is a much greater availability of lens hardware (at a cost) but thought I would ask opinions here before I decided which way to go
thanks for any input
thanks for any input