Originally posted by Rupert Sigma is making some very nice glass to fit Pentax, and we should be thankful they are. My Bigma 50-500 is one of my favorite lenses.....where would I get such a lens without Sigma?
Regards
You are making a very valid point here.
Pentax does lack a lot of lenses: >300mm, <10mm, a rectilineair <12mm zoom, <f4 300mm, TC's, etc, etc.
Sigma and Tamron are extremely important and I would have left Pentax for N or C a long time ago without them filling in the Pentax shortcomings.
The problem however is the variety in quality between the Sigma and Tamron lenses. Some designs are outstandig, some designs are average and some below average.
IMHO you need to be selective in your choices.
Bert