Archived posting to the Leica Users Group, 2010/07/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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 >