Originally posted by ogl It's AF teleconverter for SDM lenses - Ned Bunnell said it would be 1.4х.
DA*300 will be 630 mm.
But a lot of us needs 1.7x or even two - 1.4х and 2.0x.
How about a TC that can be switched between 1.4x, 1.7x and 2x, using a design concept similar to Leica's Tri-Elmar lens design? DA*300 would become a 420mm f5.6, a 510mm f6.3 and a (probably manual focus only?) 600mm f8.0. That would blow away the need for adding a Bigma!
Or, if it was possible, a zooming TC from 1x to 1.7x or 2x? No need to de-mount the lens apart for IQ improvement at 1.0x. Now,
that would be a unique first for Pentax.
I'm even sure that owners of DA* lenses would pay a high price for a really high quality TC like this!