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06-18-2012, 03:52 AM   #1
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Teleconverter query

Hi all,
does anybody know if there's a 1.4 teleconverter of any brand for pk lenses that is capable of turning K and M series lenses basically into A lens?
I ruled out Pentax's own AF 1.7 teleconverter because it's too expensive...and 1.4x would suit me better. Is there anything like it? Cheers...

06-18-2012, 04:00 AM   #2
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There is no such teleconverter. Even the SMC-F 1.7x AF converter does not do this. It provides limited AF assist but not automatic aperture
06-18-2012, 04:26 AM   #3
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http://www.robertstech.com/matrix.htm

Also works for P-TTL flash aside from matrix metering.
06-18-2012, 08:37 AM   #4
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QuoteOriginally posted by selar Quote
http://www.robertstech.com/matrix.htm

Also works for P-TTL flash aside from matrix metering.
Sorry but on it's own this does not work for P-TTL flash because it requires that an A pin be installed in the third pin location from the lens locking pin. P-TTL does not work with the lens not in an A position.

Also note that modifying the lens to attempt to make it an A lens is not practical because the aperture linkage is not the same in a K and an A lens, and the exposure errors can be up to +/- 2 stops

Been There, DOne that, Got the Teeshirt

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