You are probably right. According to Bojidar Dimitrov the Super A and P50 have electronical, vertical run shutters, with max. speed of 1/2000 sec. (1/125 sync) and 1/1000 sec. (1/100 sync.). Perhaps this is not enough.
What I may need seems to be a camera like the PZ-1 which has a max speed of 1/8000 sec. and it is probably able to fire a flash even at that speed (don't remember). At work I have a PZ-1p. I may give that one a try as a flash testing machine. BTW, I don't really want to know how long the flash light is on during exposure. I just find amusing to try to figure out a practical way to examine this. Someone suggested that it is possible to photograph a moving object, and then measuere the "tail" in front of or behind the object, depending on the sync used - leading or trailing curtain. Not a bad idea, if the speed of the moving object is known. This procedure is similar to the test mentioned by Jostien. If I put a 30 cm disc on my power drill (3000 RPM) I will get a speed at the edge of app 4.7mm in 1/10.000 of a sec. and app 1mm in 1/50.000 sec. Maybe that should do it? I would prefer a speed of perhaps 12000 RPM. This would give me a speed of app. 19mm in 1/10.000 sec. and 3.8 mm in 1/50.000 sec., using a 30 cm black disc. wequiped with a bright, white spot at the edge. Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: Frantisek [mailto:[EMAIL PROTECTED] Sendt: 12. december 2004 14:00 Til: Jens Bladt Emne: Re: flash duration JB> So, I'll have to use film (K1000, Super A, P50) for measureing the flash JB> duration, using the shutter slot to indicate the duration of the flash. Hi Jens, usually this method is used the other way around, to measure acceleration of shutter curtains and consistency of their travel. Your average mechanical shutter is in no way accurate enough in its travel to measure this. The electrical ones could be better for this. Unless I forgot something :) Good light! fra
