I decided that I need something in the 300-400mm range...
Pentax only has the 55-300, which if it were a bit longer would fit the bill. It is too slow to use with a TC.
My other choices are:
a
- Tamron 70-200mm f2.8 with a 2x converter from sigma or Tamron
- Sigma 120-400mm 4.5-5.6
- Sigma 100-300 f4 with 1.4 converter
Does anyone have any idea about the compatibly of the Tamron 70-200 with 2x converter in terms of AF, aperture control,etc with the K7? will either the tamron or Sigman TC support HSM?
Thanks for your input
Nick