645 format vs. 35mm???

heespharm;1140460In my [I said:

personal[/I] view there isn't much difference between 35mm and 6x4.5... It's a 1cm or 10mm height difference which is about a 20% difference where I feel I can use slower films and proper processing to make up that difference

35mm Vs 6x7 is almost 1.8 or double the size... Now that's a difference... No amount of processing in my ability or film speed could make up for that large of a difference

Just my 2 cents

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MattKing said:

FWIW:

A 135 negative is 24x36mm = 864 square mm

A 6x4.5 negative is 42x56mm = 2352 square mm

A 6x7 negative is 56x69.5mm = 3892 square mm.

So the ratios are:

a) 6x4.5 is 2.72 times the size of 135;
b) 6x7 is 4.50 times the size of 135; and
c) 6x7 is 1.65 times the size of 6x4.5.

All medium format sizes are taken from the manuals for Mamiya equipment.

Click to expand...

MattKing said:

FWIW:

A 135 negative is 24x36mm = 864 square mm

A 6x4.5 negative is 42x56mm = 2352 square mm

A 6x7 negative is 56x69.5mm = 3892 square mm.

So the ratios are:

a) 6x4.5 is 2.72 times the size of 135;
b) 6x7 is 4.50 times the size of 135; and
c) 6x7 is 1.65 times the size of 6x4.5.

All medium format sizes are taken from the manuals for Mamiya equipment.

Click to expand...

heespharm said:

woah nice math... yeah ur correct... I was only considering height of frame.. but if you talking surface area there's a load of difference!!!..

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