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01-05-2008, 07:11 AM   #16
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Blende8, I have the same extension tube and it will work perfectly with my A400 5.6 metering. That extra pin on the converter does more than gray scale. On my 400 the camera can't even figure out the max aperture with the Kenko 1.5 converter. It picks 2.8 for a lens that is only 5.6! Same problem with Phoenix/Tokina 2X converters. The Pro Master (which looks the same, except with extra contact) is the only one that meters correctly. The cheapest converter I own is the only one that works correctly!

01-05-2008, 07:35 AM   #17
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If you look at Bojidar's K-mount page

Features and Operation of the Ka Mount

you can see that the pin that is missing on the 1.5x converter is the so called "m2" pin.

Your A400/5.6 is an f5.6-f45 lens.
This would mean that the pin m2 should be isolated (011*00)
(Compare the table on the page linked above.)
Since the pin m2 is not present, it will be conductive always, giving a 011*10 lens, which is, according to the table, an f2.8 lens.

I have no idea why Kenko built the converter in such a strange way.

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