Originally posted by Fenwoodian The Pentax lenses were only tested on a crop frame sensor!
Indeed. It's hard to match lenses across platforms, but look for example at a comparison between the
Sony NEX 50 f1.8 and the Pentax 50 f1.8. The Pentax and Sony 'nifty fifty's score the same, and the Sony NEX ranks as one of the sharpest NEX lenses.
Originally posted by Canuck_west I would also add that it is I believe it is questionable that Sigma would offer its Art line in a K mount.
This will be news to my Sigma 35 f1.4 Art (in K-mount). And news to the many buyers of the Sigma 18-35mm f/1.8 DC HSM Art in K-mount.
I detect a lot of un-warranted presumptions when it comes to Pentax glass in this thread.