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09-02-2009, 06:53 AM   #1
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is this old flash safe for K200D?

I got a vivitar 2500 flash, and want to use it on my K200D.
I have measured the output voltage from the flash, it is about 11~12V.
So, it should be safe for K200D. right?

Thank you!

09-02-2009, 06:57 AM   #2
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G'day.
I've heard (not a definitive source of reliable info, I realise) that voltages of less than 30V are OK on dSLRs though some authorities advise on voltages less than 10V.

I don't think you'd have an issue with your flash, but as with anything electrical, use with caution...
09-02-2009, 07:23 AM   #3
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before declaring it safe for use, what type of meter did you use.

if you measure the trigger voltage on different voltage scales does the measured value change?

some types of meters influence the trigger voltage measurement because the input impedance is too low, and / or it changes as a function of measurement range.

All I can say is be carteful when making mesurements to be sure you are measuring the real voltage
09-02-2009, 07:25 AM   #4
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Thanks!

I used a digital multimeter, and can not adjust range when measuring DC voltage. I have measured several times, all read as ~11.63V.

I hope it is correct.

This flash was used with Pentax ZX-M film camera before.


QuoteOriginally posted by Lowell Goudge Quote
before declaring it safe for use, what type of meter did you use.

if you measure the trigger voltage on different voltage scales does the measured value change?

some types of meters influence the trigger voltage measurement because the input impedance is too low, and / or it changes as a function of measurement range.

All I can say is be carteful when making mesurements to be sure you are measuring the real voltage


09-02-2009, 09:59 AM   #5
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I used a Metz 45CT4 for about 6 months (it's now my backup because I have other flash guns) with my K10D without any ill-effect.

The trigger voltage of the 45CT4 is 22V.
09-02-2009, 12:10 PM   #6
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This site has a list of flashes and the tested voltages, Photo Strobe Trigger Voltages
The 2500 has tested from 10.95vdc to 14.5 vdc.
09-03-2009, 09:42 AM   #7
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I also had a old vivitar 3700, works great with K20D, you just need to manually adjust light meter.
09-03-2009, 09:52 PM   #8
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try the Wein Safe Sync

I just posted a blurb on what I did to more safely use an old flash to the forums a few minutes ago ... I spent $56 at a local photo store on a Wein Safe Sync that mounts on your hot shoe and then allows you to attach older flashes via hot shoe or PC cable ... I believe it can take up to 400 volts and convert it down to 6 volts at your camera's hot shoe ... so far so good ... here's a link to my post ...

https://www.pentaxforums.com/forums/pentax-dslr-discussion/72240-k200d-hanime...sync-hshs.html

09-07-2009, 05:16 AM   #9
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QuoteQuote:
Wildlifephotog spread the word:
"This site has a list of flashes and the tested voltages, Photo Strobe Trigger Voltages "
Thank you Mr.,
I was finally able to sort out my Dynosaurs into the well-behaved pets vs. the firespitting Godzillas .-)

Best, Georg (the other)
09-09-2009, 10:41 PM   #10
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QuoteOriginally posted by wildlifephotog Quote
This site has a list of flashes and the tested voltages, Photo Strobe Trigger Voltages
The 2500 has tested from 10.95vdc to 14.5 vdc.
Yeah that was the information I was going to give people, but being an ex-Canonian I knew I shouldn't be using more than 4.5V in Canon EOS cameras, what is the exact secure limit in Pentax cameras? We still don't know.

Say secure limit is 6V and you used a 25V flash several times and nothing happened, that doesn't mean a camera fry up won't happen in the future.

I guess best way to learn this measuring highest voltages of the P-TTL flashes and accepting that voltage as secure limit.

Now what is it, anyone knows?
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