----- Original Message ----- From: "mike wilson" Subject: Re: A few questions on a Zeiss Ikon,an old film and a studio lighting peace
> >> >> From: Paul Sorenson <[EMAIL PROTECTED]> >> Subject: Re: A few questions on a Zeiss Ikon, an old film and a >> studio lighting >> peace >> >> 1) The "F" and "M" are to match the shutter timing to the peak >> output >> of flashbulbs. "F" bulbs peak 5 milliseconds after ignition, while >> "M" >> bulbs peak at 20 milliseconds. Each is of a relatively short >> duration, >> but not as short as electronic flash. "FP" (focal plane)bulbs are a >> horse of another color as they peak after about 5ms, but have a long >> duration so a focal plane shutter can be used at higher speeds. > > I don't think it can be "peak", as that point will vary from bulb to > bulb. It's start - the bulbs need more time to get lit and start > outputting light, so they have more lead time. Electronic flash fires > much quicker and can be started once the shutter is open. > Paul is correct on this one. William Robb -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
