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05-27-2009, 12:08 AM   #1
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Pre-DA Lenses and Flashes

How well can Pre-DA lenses 'talk' with external flashes? From which series do they work as well as DA lenses when it comes to AE combined with a flash? From the A-series on?

05-27-2009, 12:51 AM   #2
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I'll be corrected if I'm wrong, but I believe that anything from an 'A' lens onward should function the same with P-TTL flash (I'm assuming we're talking about P-TTL, as an 'auto thyristor' flash can be used with anything using the flash's own light sensor). Go to an 'M/PK' lens, M42, etc., and the P-TTL flash will fire full power so you'd have to resort to manually compensating based on flash guide number, focus distance, aperture, & ISO setting.
05-27-2009, 08:24 AM   #3
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So for the amount of light all that's needed is an automatic aperture? How about zooming, isn't there a chip involved with telling the flash how far too zoom?
05-27-2009, 08:29 AM   #4
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I have found that my KAF2 lenses (power zooms) modify the zoom of the flash, although I have some questions regarding the zoom, which pentax has not answered to my satisfaction, and I think there is some confusion between flcal length and FOV for some of the zooms and my AF540TGZ

05-28-2009, 03:58 AM   #5
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Anyone else? (bump)
05-28-2009, 04:43 AM   #6
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try this link\

Pentax Lens/Camera Compatibility - Mark Roberts Photography
05-28-2009, 04:55 AM   #7
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Thanks, that was exactly what I was looking for
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