Contrast range is right. The Lumidisc allows you to measure the incident light coming from each light you are using, main and modelling, or whatever you'd like to call them, and work out the contrast range from this information. Its also good for copying ... tells you what light is falling directly on your copy table.
By the way I've just tried out the Lumidisc, Lumisphere and Reflected light filter on white and grey cards. It all matches very nicely. The Lumidisc gives, from the subject position (table top), the same stop within 1/10 as a reading from a grey card with the reflected light filter. The Lumisphere gives a little more unless I turn off the room lights and wait for midnight. There is a two stop difference between grey and white cards, as expected. I can explain the tenth of a stop error. The 'Grey Card' I have is a piece of grey foam I found to have *almost* the same reflectance as a grey card. I stuck it to the back of a nice white card and voila I have a Kodak grey card without having to shop around - again. I tried a few places on the phone ... some hadn't even heard of a KGC. Kodak in Helsinki knew about them, but didn't have stock! How do you like that? Am I now going to be censored for making my own as I was for sticking two adaptors together when I couldn't get a lens reversing ring? The Sekonic L-328 is small, light, can be operated easily with one hand and costs under $300. Don _______________ Dr E D F Williams http://personal.inet.fi/cool/don.williams Author's Web Site and Photo Gallery Updated: March 30, 2002 ----- Original Message ----- From: "whickersworld" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Wednesday, May 28, 2003 12:58 PM Subject: Re: Incident meter suggestions wanted > Collin B wrote: > > > > The dome is not flatter. Just smaller, providing for an > overall > > flatter design to the whole unit. Hence easier to handle. > > There's no effect to any degree that I've noticed. > > I've not compared readings. > > Under the dome is a lens which focuses light onto the > sensor. > > The results would be the same. > > > Hi Collin, > > I believe the flat diffuser (the "Lumidisc"?) has a > different purpose to the hemispherical diffuser. If I > remember correctly, the hemisphere is used for conventional > incident readings but the Lumidisc has something to do with > assessing contrast range. > > I may be wrong; after evaluating the Sekonic, Gossen and > Minolta ranges, I had decided on a Minolta. However, I was > offered a nearly new Gossen for half the new price. I have > a friend who uses a Sekonic with the Lumidisc but he's > travelling through Europe at this time and is difficult to > contact. Maybe I'll ask him when he returns home. > > John >
