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#1
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120 film looks thin?
I've been developing some 120 film and it seems as if the negatives come out
thin. the edge texts look right but i always seem to have seemingly low contrast negatives. I use the same developer / times as my 35mm film, however I notice I dont get the same contrast as 35mm is 120 film supposed to look less contrasy than 35mm??? k. |
#2
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120 film looks thin?
Hi K,
120 film is not supposed to look thinner. I suspect the problem lies with the use of two different light meters. The light meter you are using with the medium format camera is telling you there is more light than is actually there, so you are giving the negative less exposure. Do a head to head comparison of the two light meters to see if this is correct. Francis A. Miniter k wrote: I've been developing some 120 film and it seems as if the negatives come out thin. the edge texts look right but i always seem to have seemingly low contrast negatives. I use the same developer / times as my 35mm film, however I notice I dont get the same contrast as 35mm is 120 film supposed to look less contrasy than 35mm??? k. |
#3
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120 film looks thin?
"k" wrote in message . net.cable.rogers.com...
I've been developing some 120 film and it seems as if the negatives come out thin. the edge texts look right but i always seem to have seemingly low contrast negatives. I use the same developer / times as my 35mm film, however I notice I dont get the same contrast as 35mm But you're using a different camera. Maybe the exposures aren't the same due to metering, shutter speed error, etc. Is the shadow detail comparable to what you get in 35mm? You may have to adjust your exposures based on the behavior of the equipment. is 120 film supposed to look less contrasy than 35mm??? Have you printed any of the negatives to see if your judgement about the contrast is accurate? Maybe looking at a larger negative is throwing off your perception of the contrast. |
#4
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120 film looks thin?
35 mm and 120 rolfilm is NOT the same film :
35 mm have a special coating on the back of the film to avoid reflections in the emulsion 120 film does not have this coating because it is backed with blackpaper. As a general rule, you should develop 120 film longer "k" schreef in bericht et.cable.rogers.com... I've been developing some 120 film and it seems as if the negatives come out thin. the edge texts look right but i always seem to have seemingly low contrast negatives. I use the same developer / times as my 35mm film, however I notice I dont get the same contrast as 35mm is 120 film supposed to look less contrasy than 35mm??? k. |
#5
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120 film looks thin?
"arnold henri" wrote in message ... 35 mm have a special coating on the back of the film to avoid reflections in the emulsion 120 film does not have this coating because it is backed with blackpaper. As a general rule, you should develop 120 film longer If the coating is on the back of 35mm film and the emulsion is on the front, why would extended development be required for rollfilm? Jim |
#6
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120 film looks thin?
"arnold henri" wrote in message ... 35 mm and 120 rolfilm is NOT the same film : 35 mm have a special coating on the back of the film to avoid reflections in the emulsion 120 film does not have this coating because it is backed with blackpaper. As a general rule, you should develop 120 film longer "k" schreef in bericht et.cable.rogers.com... I've been developing some 120 film and it seems as if the negatives come out thin. the edge texts look right but i always seem to have seemingly low contrast negatives. I use the same developer / times as my 35mm film, however I notice I dont get the same contrast as 35mm is 120 film supposed to look less contrasy than 35mm??? k. 35mm film may look denser because the _support_ has a pigment in it to prevent the condution of light laterally through the support. It also has an anti-halation funtion but 35mm film is usually back coated with an anti-halation dye. The difference is the pigment used in the support since both kinds of films have a back coating. The back coating is gelatin. It serves two purposes, one is to reduce curling of the film because of the differential shrinkage of the emulsion. The back coating is supposed to shrink abuot the same amount to counter the curling. It sort of works. The other purpose is to carry the anti-halation dye. This dye is decolorized in the developer and also in the fixing bath. Some of it also washes out. The result is that the _backing_ is clear after processing. The anti-light-piping pigment in the support of 35mm film is neither decolorized or washed out so the support looks gray. color films do not have this pigment. Instead they have an anti-halation layer coated under the emulsion layers, perhaps as part of the subbing. As with the back coating the dye is decolorized in processing so the support looks clear. Since this layer is inbetween the support and the emulsion no pigment is needed in the support. The reason 35mm films have the anti-light-piping pigment is that sometimes one end is exposed to fairly strong light, as when film in a cassette is being loaded. The pigment in the support prevents light from being conducted through the support causing fogging. Agfa B&W films seem to have an anti-halation layer under the emulsion similar to color films. There is still a gelatin back coating on films with the anti-halation layer under the emulsion to act as an anti-curling layer. Now, that said, the measure of a negative is its printing qualities. If the negative prints on normal grade paper with good contrast, and has good shadow detail, its not thin. For some reason some films can look thin and print perfectly. My experience with T-Max films indicates they are like this. Some developers (Microdol-X when used full strength for example) leave the image a slightly brown color which can look a little thin but print normally. -- --- Richard Knoppow Los Angeles, CA, USA |
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