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02-27-2009, 02:34 AM   #1
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Location: Newbury, England
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Using Older Flash

One area I really haven't explored with my Pentax/Samsung DSLRs is Flash assisted photography.

In one of the various ebay lots I bought shortly after getting my K100D there was a Chinon S-250 Zoom Flash included (that wasn't even advertised in the lot). I checked out the voltage spec (5.17v - ) so I put some AA batteries in it and found it works OK.

I've read the original manual that came with it (there's a copy here: and following it's instructions I do seem to get quite reasonable results particularly with bounce flash. It has a Guide Number of ISO100/feet = 82.

However what I'm trying to figure out is:

1. What's the best way to use a flash like this on my K100D and GX-10.
2. What more would I get with a Pentax AF360 that I can't do with this Chinon flash.
3. Can anyone work out what this Guide number means compared to the AF360.

Your advice much appreciated


Edited to correct voltage details

02-27-2009, 05:47 AM   #2
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
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I believe the AF360FGZ is GN 36 in meters, your flash with GN 82 in feet is about 25 meters, therefore the AF360 is slightly more powerful

second, the chinon flash will not be compatible with P-TTL, and therefore you will be extremelt limited in what you can do on a modern DSLR,

finally, you would need to check that the flash trigger voltage as the older unit may damage your camera
02-27-2009, 08:16 PM   #3
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Join Date: Oct 2008
Location: Ohio
Posts: 276

You already know a lot about this flash and Lowell answered most of your questions. I can only suggest you to use it off camera. You will be happy. The only thing missing from this flash I believe is manual power level control i.e. 1, 1/2, 1/4 etc. Well, you can place the flash at different distance from the subject.

Just my 2 cents.


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