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03-17-2007, 06:09 PM   #1
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k100d external flash

I just got a K100D (and the flash broke, another thread for that) but is my external flash that my mom gave me from her old slr compatible? Its an AF280T

03-18-2007, 02:56 AM   #2
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QuoteOriginally posted by Dragoness Quote
I just got a K100D (and the flash broke, another thread for that) but is my external flash that my mom gave me from her old slr compatible? Its an AF280T
Nope, except you can still use it in full manual operation. For more details, see:-

RiceHigh's Pentax K100D Full Review
03-18-2007, 06:00 AM   #3
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You can use it in Auto mode or Manual mode. You just can not use it in TTL mode, as the K100D does not support it.

Hope this helps
.
03-18-2007, 09:48 AM   #4
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QuoteOriginally posted by roscot Quote
You can use it in Auto mode or Manual mode. You just can not use it in TTL mode, as the K100D does not support it.

Hope this helps
.
ok so using it wont zap the camera then? what happens if you try to use ttl?

03-18-2007, 12:15 PM   #5
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You will get incorrect exposure using TTL. P-TTL that the K100D supports requires a pre-flash to set exposure. The 280T's TTL does not pre-flash, so the camera can not set the proper exposure.

I shot a dog show with it in Auto mode with my K10D while my Sigma EF500 was being rechipped. It worked very well.

Tigger voltage on my sample is something like 7.3 volts. Should not be a problem with the K100D.
03-18-2007, 12:47 PM   #6
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If you want to see a listing of the trigger voltages for different flashes, try this site

Photo Strobe Trigger Voltages
03-18-2007, 03:52 PM   #7
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Oh thank you everyone. Does anyone happen to know what voltage the K100d can handle?
03-18-2007, 07:49 PM   #8
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QuoteOriginally posted by Dragoness Quote
Oh thank you everyone. Does anyone happen to know what voltage the K100d can handle?
It states below the maximum toleratable trigger voltage for *ist D DSLRs is 30V:-

Powershot Posts

03-19-2007, 02:16 AM   #9
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Yeah, Pentax USA quoted that number for me a couple of years ago. I've been assuming that the K series cameras have the same tolerance. Does anybody know for a fact that this is true?
03-19-2007, 02:28 AM   #10
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QuoteOriginally posted by roscot Quote
Yeah, Pentax USA quoted that number for me a couple of years ago. I've been assuming that the K series cameras have the same tolerance. Does anybody know for a fact that this is true?
When I read further for those Powershot Posts, I found also the following user report:-

"I checked a new Vivitar 285HV with Quest rechargable batteries and got 13.31 volts. I have burnt the sync out of two Pentax AF bodies in the last year. I shoot mostly on beach with flash fill. I solved the problem by buy a Nikon FM2 and a Fuji 670 for my flash work. These cameras show no problems and it fun to tell the camera what to do for a change. I use a Sun ringlight on a Fuji 6900 digital camera. So far no problems This is a wonderful site. This is info that needs to get to the public.Thanks for all the effort...... Marshall Thurman , Big M to my friends"

So, just 13.31 V would be more than enough for burning our Pentax DSLRs in this case.
03-19-2007, 04:12 AM   #11
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Sounds like they were film bodies. Did he state which model bodies failed?
03-23-2007, 01:13 AM   #12
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QuoteOriginally posted by roscot Quote
Sounds like they were film bodies. Did he state which model bodies failed?
I have completed my recent research article on the issue and I hope it does provide additional info on the case:-

RiceHigh's Pentax Blog: Which Flash Units are Safe for Pentax DSLRs?

In short, my recommendation is: Use only original Pentax flash units! (as what the user manuals always suggest - it's not a joke!)
03-23-2007, 02:17 AM   #13
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Still does not answer the question of
1. Which bodies failed at 13.31 volts. You are assuming a DSLR, where my read of that guy's post is they were film bodies. We don't know for sure.

2. We know that the acceptable trigger voltage of the ist Dx series is 30volts. We do not know the compliance of the K series cameras.

Maybe I'll call tech support today, if I have time, and find out.
03-23-2007, 03:25 AM   #14
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We can assume that Pentax DSLRs or even older film SLRs (those electronic ones) are more or less the same. But even though you can know the maximum voltage finally, you don't know about the current with your non-Pentax flashes during the discharge. So, it would better go down again the Pentax route, i.e., buy only Pentax original flash units, which is the safest way to go.

QuoteOriginally posted by roscot Quote
Still does not answer the question of
1. Which bodies failed at 13.31 volts. You are assuming a DSLR, where my read of that guy's post is they were film bodies. We don't know for sure.

2. We know that the acceptable trigger voltage of the ist Dx series is 30volts. We do not know the compliance of the K series cameras.

Maybe I'll call tech support today, if I have time, and find out.
09-17-2007, 08:41 PM   #15
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"I checked a new Vivitar 285HV with Quest rechargable batteries and got 13.31 volts. I have burnt the sync out of two Pentax AF bodies in the last year."

Looking at the context of that post, and the date it was posted (over 5 years ago), I wonder about its relevance, today.

Secondly, the user never indicated that the measured flash is the one that caused the problems. In fact, he indicates later that "I use a Sun ringlight..."

SO, should we still worry? My instinct is to take the common interpretation of that user's very old post with a large grain of proverbial salt.

Last edited by Meep70; 09-17-2007 at 08:42 PM. Reason: typo
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