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Old Aug 25, 2007, 3:50 PM   #1
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I have a couple of flashes (one basic, another one that's called a *bounce computer*) that I'd like to use with the k100d.

I am sure these cannot be triggered via hotshoe.

Is there a (cheapo!) converter that will work? If not, does anyone know any low-buck (used, new, old) flashes that are decent?

Saw the new gen pentax ones, but I'm not even sure if I should bother with flash photography (dunno if I'll like it) so I wouldn't want to drop too much change.

Thanks guys!
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Old Aug 25, 2007, 4:50 PM   #2
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if they are hot shoe flashes then they will fire with the pentax.
you need to ck the trigger voltage BEFORE!!! you even try!!!!! please don't fry your cam.
what cam are you using? what model flash?? give us some info.

roy
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Old Aug 25, 2007, 4:52 PM   #3
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just saw the k100. these will have to be used in their manual mode with that cam. they should work tho. CK THE TRIGGER VOLTAGE BEFORE YOU TRY THEM!!!

roy
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Old Aug 25, 2007, 5:26 PM   #4
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I had the same concern. I've got a wonderful flash about 20 years old..a Vivitar 285 HV (High Voltage). I've used it on everything from a Leica to a Mamiya 2 1/4 to all my Pentax Slr's.

It's powerful..throws light quite a ways...but I have heard...do not use it on a DSLR as it will fry the digital's circuitry.

So it remains unused...except on film cameras which I don't use very often anymore.

I don't know who can answer your question for sure...as if you're like me...you don't want to take a chance on a new digital camera.

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Old Aug 25, 2007, 7:48 PM   #5
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Here is a ling to an ended auction. It is the exact same.

It says it's an auto-thyristor. Manual says Guide number 20 at asa100.

No trigger voltage indicated anywhere.

http://cgi.ebay.com/IMAGE-CB-21-AUTO...QQcmdZViewItem

On google, I found a forum thread with the following post:

"Image CB-21 swivel head trigger voltage +63.5V. Measured per your instructions with DVOM."

Is that even possible? Safe to use?


Seens like a pretty decent flash, with a light sensor and everything.

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Old Aug 25, 2007, 8:47 PM   #6
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Gazander wrote:
Quote:
I have a couple of flashes (one basic, another one that's called a *bounce computer*) that I'd like to use with the k100d.

I am sure these cannot be triggered via hotshoe.

Is there a (cheapo!) converter that will work? If not, does anyone know any low-buck (used, new, old) flashes that are decent?

Saw the new gen pentax ones, but I'm not even sure if I should bother with flash photography (dunno if I'll like it) so I wouldn't want to drop too much change.

Thanks guys!
I sold my Pentax AF280T at around $60. It does only TTL.That is safe and a very durable flash.

I would not risk any flash over 6V. Test it out first before popping that onto your camera.

There is a device(safe syn) limiting that . Likely not expensive when used.

http://www.weinproducts.com/safesyncs.htm

Daniel
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Old Aug 25, 2007, 8:56 PM   #7
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Dumb question time



i thought we all agreed that the only dumb question is the one you don't ask.



roy
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Old Aug 26, 2007, 2:25 AM   #8
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Well, according to here



http://www.botzilla.com/photo/strobeVolts.html



the 285HV should be fine



Alan Latafat Correa checked with Vivitar and they clarified:
The 285HV has a voltage of 12V. The 285 has a voltage of 350V. Hope this helps you.



So it looks like the 285HV is the one to use.



I believe Ira uses the 285HV auto thyristor all the time on his camera.



I even bought a Macro Ringflash a couple of days ago, as the botzilla site said it was safe. I do like my ringflash.....





Dal

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Old Aug 26, 2007, 4:29 AM   #9
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Gazander
ck the voltage yourself. it's easy and safe. don't hook anything up to your cam until you know it's safe.

darren, i hope you like the ring flash. drop me a line if you need help setting it up.
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Old Aug 26, 2007, 7:21 AM   #10
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Yes I have used a Vivitar 285HV on my DL and DS, the voltage was somewhere around 6V for mine. I also have a Vivitar 285 that tested less than 10V, but don't trust one of these unless you test it first.

Test procedure: Use a digital voltage meter (start with the DC low voltage setting), turn on the flash, put one meter probe on the contact in the grove of the flash foot and the other on the centre contact and thensee what the meter reads. If it reads error or out of range then set the meter for a higher level and try again. The flash should not fire during this test. If you get a reading less than 20V it should be safe, 20-30V iis risky, over 30V may do damage, and of course if it reads in the hundreds of volts it is a slave only unit.

Ira
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