Actually F is "fast" sync and M is "medium" sync. Fast sync bulbs need to be fired about 5 milliseconds (not sure of the exact figure on "F") after the shutter is triggered, and medium sync fires at 20 milliseconds. These delays allow the shutter to be fully opened at the time the M type sync bulb fires. F type bulbs have a longer flash duration and were intended to be used at lower shutter speeds only (longer than 1/30 second). Bulbs for focal-plane type shutters are FP type and have a very long duration. You can usually get away with using F type bulbs with 35mm focal-plane shutters, the FP type are needed for the big old press camera focal-plane shutters like on the Speed Graphic.
-- graywolf http://www.graywolfphoto.com http://webpages.charter.net/graywolf "Idiot Proof" <==> "Expert Proof" ----------------------------------- mike wilson wrote: > Lasse Karlsson wrote: >> Hi all, >> >> I would appreciate some help on a few things. >> At the following adress there are a few pictures. They are self explanatory. >> I got a few questions regarding what's in them. >> >> http://www.photo.net/photodb/folder?folder_id=627921 >> >> 1) Regarding the Zeiss Ikon Nettar "front piece": You can see this red >> little thingy set at "F". >> Now what does this red thing do there? What does "F" and "M" mean? > > It's a flash selector. F for Focal plane, meaning flash bulbs, and M > for, er, Modern [8-)))], meaning electronic flash. > >> 2) You'll see two pictures of one very old (exposed) film canister. a) Can >> anybody estimate some dates for it's production? b) Any suggestions on what >> process might get any pictures out of it? > > Certainly 1970s or older. The number down the right hand side of the > label might give you a clue. Why not ask Agfa? Best option would be a > clip test in B&W chemistry. > >> 3) You'll see another thingy, which is a (infrared?) sender which will >> trigger some Godard studio lights that I will start learning how to use. It >> obviously needs a battery. Does anybody know of what voltage this battery >> would be? (Or is this evident? There are batteries of different voltages >> that will physically fit, right?) > > Probably not - looks like a standard 9volt (PP9 or whatever the modern > equivalent is) connector. > >> Many thanks in advance for any answers or good clues. >> >> Lasse >> >> > > -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
