Anyone uses old Pentax Primes on the Nex?

It is difficult to know where to start here. I have tried both these and they seem to be ok. I will have a closer look in the coming days. I use the Pentax-A 100mm f2.8 a lot - it is excellent. When travelling I take the Sony 16mm, the 18-55 mm and this Pentax 100mm. If I am travelling light I also take macro rings and a helicoid extension for use with the 100mm.

Others I use frequently are the Pentax K 200mm f2.5, Pentax-A 300mm f4 and two old Takumar macros, the 50mm f4 and the 100mm f4. These macros are heavy and the Sony macro might replace the Takumar 50mm.
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Tony