I simply put an increasing number of layers of paper towel over the Sigma 5950 until the output was no longer adequate to overexpose at full aperture and a close distance. That means the flash now has to expose at GREATER THAN it's minimum output, even at 6 inches distance. Took 5 layers of white "Bounty" brand towels on this one. As an added benefit the light is a good bit softer now.
Don > -----Original Message----- > From: Godfrey DiGiorgi [mailto:[EMAIL PROTECTED] > Sent: Sunday, July 17, 2005 4:04 PM > To: [email protected] > Subject: Re: Dual Flash with *istDS > > > The AF400T might simply not be able to shorten the flash duration > enough to work with an ISO 200 sensitivity at macro ranges. Are you > stopped down all the way? > > > With film, all the flash metering was off the film, directly. I'm > > not sure how it happens with digital, but I suspect that preemping > > calculations now play a greater part. If the metering is still done > > off the medium, it has to cope with a CCD that has different > > reflective properties than has film. > > It works the same way. The TTL flash metering sensor in the camera > has been calibrated to work with the sensor's reflectance. > > Godfrey > > > On Jul 17, 2005, at 1:17 PM, Jostein wrote: > > > Markus, > > Sorry, I should have mentioned that I use TTL, not manual flash. > > > > As to why the *istD handles flash differently from Z-1 and LX, I'm > > a bit at loss. > > However, there's manuy circumstances that have changed. At some > > time in the nineties (actually after the Z-1), Pentax began > > communicating focus distance data from lens to camera (FA lenses), > > and changed the flash communication from voltage to digital > > (AF300FTZ and AF500FTZ). > > > > With film, all the flash metering was off the film, directly. I'm > > not sure how it happens with digital, but I suspect that preemping > > calculations now play a greater part. If the metering is still done > > off the medium, it has to cope with a CCD that has different > > reflective properties than has film. > > > > Jostein > > > > > > ----- Original Message ----- From: "Markus Maurer" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Sunday, July 17, 2005 9:53 PM > > Subject: RE: Dual Flash with *istDS > > > > > > > >> Hi Jostein > >> Does the AF400T in manual mode with 1/25 power setting still give > >> too much > >> flashlight with the *istD? > >> And why is the handling of flashlight different on a digital body? > >> > >> a film only user wonders .... > >> greetings > >> Markus > >> > >> > >> > >> > >>>> -----Original Message----- > >>>> From: Jostein [mailto:[EMAIL PROTECTED] > >>>> Sent: Sunday, July 17, 2005 3:46 PM > >>>> To: [email protected] > >>>> Subject: Re: Dual Flash with *istDS > >>>> > >>>> > >>>> Brian, > >>>> > >>>> That's a very interesting setup, not the least in light of the > >>>> recent > >>>> threads about macro flash. What's your working distance in this > >>>> particular shot? > >>>> > >>>> I have been experimenting with my AF400T and the *istD. So far I've > >>>> only tested it at macro distances, where it delivers waaay too much > >>>> light. All my exposures have been at least two stops over. Much > >>>> to my > >>>> disappointment, because it was my macro flash of choice for use > >>>> with > >>>> Z-1 and LX. :-( > >>>> > >>>> Jostein > >>>> > >>>> > >>>> ----- Original Message ----- > >>>> From: "Brian Walters" <[EMAIL PROTECTED]> > >>>> To: <[email protected]> > >>>> Sent: Sunday, July 17, 2005 2:07 PM > >>>> Subject: PESO: Dual Flash with *istDS > >>>> > >>>> > >>>> > >>>>> Hi all > >>>>> > >>>>> This photo of a flower (Grevillea lanigera, for the botanically > >>>>> minded) was taken with a dual flash set up on a home made bracket > >>>>> attached to the *istDS. This is the set up I've been using for a > >>>>> few > >>>>> years with the Super A but this is the first time I've used it on > >>>>> the > >>>>> *istDS. > >>>>> > >>>>> http://members.ozemail.com.au/~sgap/photos/paw/g-lan-paw.html > >>>>> > >>>>> Mainly, I'm posting this because a few people have wondered > >>>>> whether > >>>>> old flash guns can be used safely with the *istD/DS. The set up > >>>>> comprises an AF280T on the left hand side of the camera (looking > >>>>> from > >>>>> behind) and above the subject with an AF200S on the right on about > >>>>> the > >>>>> same axis as the subject. The flashguns are attached to the > >>>>> hotshoe > >>>>> via a combination on 5P and 4P off-camera cables and adapters > >>>>> (although ordinary sync cables could be used because the cables > >>>>> only > >>>>> provide electrical connections - both flashes are fired on > >>>>> 'Manual'). > >>>>> Both flashes also have some translucent plastic in front of the > >>>>> flash > >>>>> heads to diffuse the light. > >>>>> > >>>>> The background is a bit dark but I don't really mind this as it > >>>>> makes > >>>>> the image a bit more three dimensional. Comments on the subject > >>>>> and/or technique welcome. > >>>>> > >>>>> > >>>>> Cheers > >>>>> > >>>>> Brian > >>>>> > >>>>> > >>>>> > >>>> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > >>>> ++++++++++++++++++++++++++++++ > >>>> > >>>>> > >>>>> Brian Walters > >>>>> Western Sydney, Australia > >>>>> > >>>>> > >>>> > >>>> > > > > >
