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Forum: Pentax DSLR Discussion
01-16-2019, 03:16 AM
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As pointed out above an "A" type TC with electrical contacts will allow you to control the aperture except on KAF4 lenses. The TC will not compensate for the speed or f-stop loss, nor will it vary the maximum aperture on variable aperture zooms (e.g. f4-5.6 zooms). There are AF TCs from the KAF film era that have screw drive shafts and the 7th "data" pin but they are sort of rare to find. To work with KAF4 lenses the TC would need to have the power zoom contacts as well.
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