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01-02-2016, 07:00 PM   #1
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Film Camera Flashes on Digital Camera

Hate to sound naïve, but trying to wrap my head around film flashes vs digital flashes. I have a few Pentax TTL flashes that mount onto the camera hot shoe that were made for film type cameras. Can these flashes be safely used on Pentax digital flashes?
Any info - education - would be greatly appreciated.

01-02-2016, 07:06 PM   #2
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Yes, they can safely be used. Modern Pentax cameras only support P-TTL (not TTL), so you won't be able to take advantage of full exposure automation. But the older flashes will fire just fine, and with proper exposure settings, you can get great results.

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01-02-2016, 07:43 PM   #3
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On older non Pentax Flashes(20th & 21st Century Vintage) watch the trigger voltage. Link below to a list of some trigger voltage for different brands.


Voltages | DPanswers
01-02-2016, 08:01 PM   #4
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Note: the information given above is only true for factory Pentax TTL flashes. Having said that, you should check the trigger voltage for any older flash before using it. There is a thread on this forum describing how to do that, as well as a link To a website that describes the trigger voltage of each flash. If I remember correctly, if the trigger voltage is over approximately 12V, it should not be used on a Pentax digital camera. But please do your homework and verify it, before using your flash. it is not worth Damaging your camera for an older flash.

01-03-2016, 08:12 AM   #5
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I tried a late-70s vintage thyristor flash on an EOS (non-digital) and it knocked out the camera's electronics. After pulling the batteries and putting them back in it worked again. There's some kind of voltage-reducing hot shoe adaptor thing which I bought but never actually tried.
01-03-2016, 08:15 AM   #6
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I've used a Sunpak 422D and 544 (via the X-sync socket) on my K-5 IIs and K10D with no problems. Just an FYI for anyone reading this thread.
01-10-2016, 11:19 AM   #7
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Pentax AF 280T works well with my K-S2 - of course in manual and 'auto' modes, no P-/TTL. Moreover, 280T works with Yongnuo radio triggers, what makes off-camera lighting very affordable.
01-10-2016, 06:15 PM   #8
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QuoteOriginally posted by pentageek Quote
Pentax AF 280T works well with my K-S2 - of course in manual and 'auto' modes, no P-/TTL. Moreover, 280T works with Yongnuo radio triggers, what makes off-camera lighting very affordable.
I've been using the AF280T on my K20D and K3 bodies with very good results. Mostly I've been employing "auto" (thyrister) mode (gotta love that little flat green donut on the AF240T's front).

01-14-2016, 10:08 AM   #9
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Yup, still have & use my AF280T from film days.

Nice capabilities, & agree about the green sensor ring,
as well as the stylish old Pentax logo!
01-14-2016, 11:41 AM   #10
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QuoteOriginally posted by fwcetus Quote
I've been using the AF280T on my K20D and K3 bodies with very good results.
Chart shows AF280T @ 7.8 V well within modern Digital camera trigger voltage.
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