Archived posting to the Leica Users Group, 2010/07/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Too bad you can't just open the shutter with the lens capped, uncap the lens, fire the flash, cap the lens, like you can with film. That would f**k up the poor M8 computer brain. ;-) On Sat, Jul 24, 2010 at 3:11 PM, Philip Forrest <photo.forrest at earthlink.net > wrote: > Using front curtain flash and a shutter speed not higher than 1/30 will > allow the 20 millisecond bulbs to reach peak luminance during the > exposure. > > Phil Forrest > > > On Sat, 24 Jul 2010 12:13:16 -0700 > Henning Wulff <henningw at archiphoto.com> wrote: > > > How are you going to sync the bulbs? The built in sync will fire the > > bulbs too late. > > > > The sync current for most bulb flash guns is tiny; but the timing > > won't work. > > > > > > At 6:24 PM -0400 7/23/10, Philip Forrest wrote: > > >I already own the M8, so most of the expense is right there. > > >Flashbulbs can be had cheaply around here at yardsales, thriftstores > > >and sometimes online. > > >I don't want full visible spectrum + IR. I just want above 700nm > > >which, with ISO 160 would force me to use a tripod and expose for > > >several seconds unless I blast it with a powerful flash. > > > > > >The flashbulbs emit a LOT of IR and with the 720nm filter, the > > >attenuation of that end of the spectrum is great so it brings out the > > >foreground a lot and can effectively black out the background, even > > >during the daytime. This way, I shoot at 1/30 sec and use GN for my > > >apertures. > > > > > >Buying another camera and having it modified is not really the > > >solution I'm looking for, nor can afford. > > > > > >Phil Forrest > > > > > > > > >On Fri, 23 Jul 2010 15:07:32 -0700 > > >Richard Man <richard at imagecraft.com> wrote: > > > > > >> Hmm... may be cheaper and easier to convert a u4/3 camera to full > > >> time IR and then use a Leica->u4/3 adapter? You get full exposure > > >> without the filter in the front and with the EVF, you get dead on > > >> focusing without errors. > > >> > > >> > > >> On Fri, Jul 23, 2010 at 1:41 PM, Philip Forrest > > >> <photo.forrest at earthlink.net > > >> > wrote: > > >> > > >> > I'm wanting to use flashbulbs with the M8 to shoot IR photos > > >> > using my 720nm opaque filter. The flashbulbs put out much more > > >> > light and further, much more IR than my strobes. This will > > >> > allow me to shoot IR handheld at 160 ISO, illuminating the > > >> > subject and depending upon background distance, leaving the > > >> > background completely dark. Effectively, turning day into night. > > >> > > > >> > The question I have is if the current of the flashbulb unit > > >> > could harm the M8. I called Leica NJ and they said they had no > > >> > idea (after researching the question for 3 days) how the > > >> > current from the CEYOO would affect the M8 since they do not > > >> > have any data regarding current in that flashbulb unit. > > >> > > > >> > Optimally, I'd like to use a CEYOO but for now and for scenes > > >> > needing a bit more light, I'm using a Graflex Graflite with #5 & > > >> > #25 bulbs synched with a pocket wizard. This is a clumsy and > > >> > very large setup though. > > >> > > > >> > My question is: can anyone out there measure the current from a > > >> > CEYOO when a flashbulb is triggered? > > >> > > > >> > Thanks all! > > >> > Phil Forrest > > >> > > > >> > _______________________________________________ > > >> > Leica Users Group. > > >> > See http://leica-users.org/mailman/listinfo/lug for more > > >> > information > > >> > > > >> > > >> > > >> > > > > > > > > >_______________________________________________ > > >Leica Users Group. > > >See http://leica-users.org/mailman/listinfo/lug for more information > > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > -- Regards, Sonny http://www.sonc.com http://sonc.stumbleupon.com/ Natchitoches, Louisiana USA