View Full Version : GN setting on an Olympus 35 DC

02-19-2008, 07:16
I recently got a hold of a lovely 35 DC and I have a question about the Guide number (GN) setting for flash photography.
I understand that when using 100 ASA film, I have to set the GN dial at 14, the guide number for my PS 100 G flash unit at 100 ASA. What do I do when using other film, e.g. 400 ASA? Do I leave the dial at the camera at GN 14 and simply change the film speed setting to 400? Or do I have to change the GN dial as well, to 28 (the GN at 400 ASA)?

So, in other words, does the camera automatically recalculate the GN when I change the ASA setting and am I consequenly supposed to set the GN dial just once: to the GN at 100 ASA?

Thanks for your advice!

K Maase, Holland

02-19-2008, 07:29
The instruction manual is here:


Type in "free" and "manuals" to access.

02-19-2008, 07:34
Thanks, but exactly this is (in my opininion) NOT clearly explained in the manual...

02-20-2008, 10:42

Try the link below. Although this references a 35RC, a full explanation of GN numbers, including settings for 400 asa, is included about half way down the page.

http://www.ph.utexas.edu/~yue/misc/35RC.html (http://www.ph.utexas.edu/%7Eyue/misc/35RC.html)

03-07-2008, 03:16
Thanks, Colin!