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calvinlo Mar 31, 2011 2:42 AM

Urgent question abt Pentax af 1.7x and K-mount lens
I'm so sorry if the queston sounds silly, but does the Pentax AF 1.7x adapter works with a Pentax 300mm 4 SMC-Great K-mount lens?

snostorm Mar 31, 2011 8:59 AM

Hi Calvinlo,

Th K 300/4 will autofocus with prefocus adjustment (as you would have to with any 300mm lens), but is a manual exposure lens, so you'd have to set the "allow aperture ring" setting in the custom menu and manually meter with this lens. From what I've seen, the lens shoots well with the 1.7x AFA. "Lowell Goudge", a long time member there has been using this combination for quite a few years.

You can compare the specs of the Pentax made lenses in this class at Bojidar Dimitrov's site:

You can read member reviews at in the lens database section.


calvinlo Mar 31, 2011 10:05 AM

Thanks for the info!

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