Ralph Barker
17-Sep-2003, 21:28
I've been tinkering with IR - specifically Macophot 820c film, which is available in 35mm, 120 4x5 and 8x10. Although mostly interested in the 4x5 and 8x10 sizes, I've been using a Leica M6 TTL as the test bed, as the 35mm film is a lot less expensive. This is the "non-aura" version of the film, which doesn't "bloom" like Kodak IR.
The first is with a Kodak 4"x4" 89B gel filter in a HiTech gel filter holder, adapted down to fit the 39mm filter size of the 35mm Summicron lens on the Leica. Exposure was 1/30 @ f/4, with the scene actually metering 1/125 @ f/16 at around 2 p.m. a couple of days ago.
http://www.rbarkerphoto.com/misc/IR/Calera091403Maco820c-08-600IR.jpg
The second one used a Lee 4"x4" polyester Wratten 87 filter in the same holder arrangement. Exposure was 1/4 @ f/4, with the same lens. The Wratten 87 filter shows a little more "IR effect" than the 89B, but the exposure was 3 stops greater.
http://www.rbarkerphoto.com/misc/IR/Calera091403Maco820c87-24-600IR.jpg
The roll of macophot 820c was developed in Ilford DD-X for 10 minutes at about 70° - a guess on my part as neither Ilford nor Cachet list recommended development times for this combination. The contrast range (which would be controlled by development) looks about right, but the negs are about 1/2 stop less dense than "normal". The posted images were scanned from the negs on an Epson 3200, with only minor adjustments in Photoshop.
The first is with a Kodak 4"x4" 89B gel filter in a HiTech gel filter holder, adapted down to fit the 39mm filter size of the 35mm Summicron lens on the Leica. Exposure was 1/30 @ f/4, with the scene actually metering 1/125 @ f/16 at around 2 p.m. a couple of days ago.
http://www.rbarkerphoto.com/misc/IR/Calera091403Maco820c-08-600IR.jpg
The second one used a Lee 4"x4" polyester Wratten 87 filter in the same holder arrangement. Exposure was 1/4 @ f/4, with the same lens. The Wratten 87 filter shows a little more "IR effect" than the 89B, but the exposure was 3 stops greater.
http://www.rbarkerphoto.com/misc/IR/Calera091403Maco820c87-24-600IR.jpg
The roll of macophot 820c was developed in Ilford DD-X for 10 minutes at about 70° - a guess on my part as neither Ilford nor Cachet list recommended development times for this combination. The contrast range (which would be controlled by development) looks about right, but the negs are about 1/2 stop less dense than "normal". The posted images were scanned from the negs on an Epson 3200, with only minor adjustments in Photoshop.