Archived posting to the Leica Users Group, 2002/08/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]- --On Thursday, August 8, 2002 8:28 AM +1000 Alastair Firkin <firkin@ncable.net.au> wrote: > Could any darkroom buffs amongst us comment on the best and most > versatile colour analysers? I have a Rodenstock CA 30, but the focotar > does not have a filter thread, and so it has become a real pain to use > with the V35, and the focometer although great, does not do colour > channels. Perhaps the Jobo 7000? I use the Jobo 5100, the predecessor to the 7000, which has more features than I even know how to use. I believe the 7000 is basically the same machine with an improved interface. I find that once a good gray channel is set up, it holds for months and months. I usually recalibrate when I get a new batch of paper with a different emulsion number. With the 5100, the workflow goes like this: 1. Change to the channel programmed with the gray reference and read a gray in the scene. If there is no gray, I put the diffuser under the lens and read part of the projected image since many "average" negatives integrate to gray in this way. 2. Change filtration to achieve "0" on all three color channels. 3. Change to the channel programmed with negative Dmax, read the appropriate part of the negative, and then stop down the lens to achieve a convenient exposure time in the 5-10 second range. 4. Insert paper and hit the foot switch connected to the analyzer to make the exposure. I get about a 75-80% sucess rate on the first print when the analyzer is programmed correctly. Of the 20-25% first print misses, most are slightly off in exposure rather than color, presumedly because the point I read for Dmax wasn't quite right. Hope this helps... - -- Rolfe Tessem rolfe@ldp.com Lucky Duck Productions, Inc. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html