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#1
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120 vs 220
Total newbie to medium format, with a newly-acquired used Mamiya m645 (J?).
Apparently it has cassettes or cartridge that allow it to take "120" or "220" format. But ... How are they different? Are not the images the same dimensions? (6mm x 4.5mm?) Is it just a matter of how long the roll of film is, and therefore (a) how many pictures can be taken on a roll, and (b) how big the cassette is? |
#2
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120 vs 220
MangroveRoot asked:
Apparently it has cassettes or cartridge that allow it to take "120" or "220" format. But ... How are they different? Are not the images the same dimensions? (6mm x 4.5mm?) Yes. Is it just a matter of how long the roll of film is, Yes. and therefore (a) how many pictures can be taken on a roll, Indeed. and (b) how big the cassette is? Aren't they (the inserts) the same size? |
#3
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120 vs 220
Are not the images the same dimensions? (6mm x 4.5mm?) The units for 6 x 4.5 are cm, not mm , but we knew what you probably meant. |
#4
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120 vs 220
On 2007-06-18, Q.G. de Bakker wrote:
MangroveRoot asked: Apparently it has cassettes or cartridge that allow it to take "120" or "220" format. But ... How are they different? Are not the images the same dimensions? (6mm x 4.5mm?) Yes. Is it just a matter of how long the roll of film is, Yes. And that 120 has a paper back while 220 only has short protective paper strips at both ends. and therefore (a) how many pictures can be taken on a roll, Indeed. and (b) how big the cassette is? Aren't they (the inserts) the same size? The lack of paper enables the rolls to have the same sizes, with ~double the length of film HTH Thierry |
#5
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120 vs 220
The 645 J uses an "insert" to hold the feed roll and take-up
spool. The units include the film pressure plate and frame counter gear. 120 film has a continuous paper backing taped only at the leading end; 220 film has a paper leader and a paper trailer both taped to the film, since the 120 film is effectively twice as thick (paper + film) it requires a different pressure plate spacing to stay flat, since the 220 film is "thinner" twice as many frames are wound on the roll. The inserts fit in fixed back Mamiya's like the "J" and also in the interchangeable film magazines for newer models. Inserts come with spiffy plastic boxes so that you can pre-load and swap inserts for quick shooting. Since I process my own film and shoot only black and white I haven't much use for 220 inserts (I hate those extra long rolls of film both to load and then to handg up to dry) but they are very convenient when shooting (color) weddings or aerials. darkroommike MangroveRoot wrote: Total newbie to medium format, with a newly-acquired used Mamiya m645 (J?). Apparently it has cassettes or cartridge that allow it to take "120" or "220" format. But ... How are they different? Are not the images the same dimensions? (6mm x 4.5mm?) Is it just a matter of how long the roll of film is, and therefore (a) how many pictures can be taken on a roll, and (b) how big the cassette is? |
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