----- Original Message ----- From: "Matti Koskinen" <mjkos...@koti.soon.fi>
> I have Corel PhotoPaint) I use only Linux and Gimp, win98 crashes almost > every time I try to scan. You're doing the plugging but not the "praying", obviously. Remember W98 is plug and PRAY! > I placed a #0 filter behind my camera and took photos. They're still > drying, but looks like they are really much better with tonality than > without the filter. Filter kit I have is Ilford Multigrade. The tests I > made showed that in a clear sunshine without filter 30 sec. was enough > but using filter 2 mins. had to be exposed. Any reason for this long > exposure? The guide in the filter box says that when enlargening using > #0 filter has no effect in exposure time. 2 reasons: -Those filters are made to filter tungsten light and you are using them to filter daylight. That may account for the increased time. -Since the use of the filter increases the uncorrected exposure time, reciprocity corrections become a bit drastic and increases the reciprocity corrected time even more. > My camera is 4x5 from an article of Popular Woodwork, searching the web > gave this link, but I printed the article so I don't have the url anymore. > Focal length is 120 mm. Here is the link: http://www.popularwoodworking.com/features/fea.asp?id=1048 Guillermo
