The FA 1.7x is very good. I've used it a number of times and it delivers good results even when coupled with a zoom. You may find that autofocus suffers when you use a mirror tele. They don't really transmit enough light. Another problem with the mirror is most are t-mounts and most t-mounts, (all I've seen in fact), are painted. The Pentax autofocus system needs a metal lens mount to short the right contacts to autofocus.

Marco Ferrari wrote:

Dear all,

have you ever used this Teleconverter?
Have you some comments?

I shot slide films, and I'm interested in converting a mirror lens and the
SMC-A 50/1.4 (both manual focus) in a long telephoto and a 85/2.38 autofocus lenses.

Thanks,

marco



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