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  1. #11

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    How about if we go with the golden ratio then you could have something like this:
    Aren't these supposed to be the perfect ratio for beauty and such?

    1 1.61803399 1 0.618033988
    2 3.23606798 2 1.236067977
    3 4.85410197 3 1.854101965
    4 6.47213596 4 2.472135953
    5 8.09016995 5 3.090169941
    6 9.70820394 6 3.70820393
    7 11.32623793 7 4.326237918
    8 12.94427192 8 4.944271906
    9 14.56230591 9 5.562305894
    10 16.1803399 10 6.180339883
    11 17.79837389 11 6.798373871
    12 19.41640788 12 7.416407859
    13 21.03444187 13 8.034441848
    14 22.65247586 14 8.652475836
    15 24.27050985 15 9.270509824
    16 25.88854384 16 9.888543812
    17 27.50657783 17 10.5065778
    18 29.12461182 18 11.12461179
    19 30.74264581 19 11.74264578
    20 32.3606798 20 12.36067977
    21 33.97871379 21 12.97871375
    22 35.59674778 22 13.59674774
    23 37.21478177 23 14.21478173
    24 38.83281576 24 14.83281572
    25 40.45084975 25 15.45084971
    26 42.06888374 26 16.0688837
    27 43.68691773 27 16.68691768
    28 45.30495172 28 17.30495167
    29 46.92298571 29 17.92298566
    30 48.5410197 30 18.54101965
    31 50.15905369 31 19.15905364
    32 51.77708768 32 19.77708762
    33 53.39512167 33 20.39512161
    34 55.01315566 34 21.0131556
    35 56.63118965 35 21.63118959
    36 58.24922364 36 22.24922358
    Last edited by Absinthe; 03-19-2008 at 09:19 AM. Click to view previous post history.

  2. #12

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    Maybe this is more like, why are manhole covers round? Because manholes are round (and yes I know round is the shape that can't call in it's own hole)

    All the frames and mats are cut for 5x6 and 8x10 and such

    I assume that photo labs don't have cut sheets, but actual roles of one width or the other and the get cut as it goes.

  3. #13

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    Wow, that looked all pretty when I pasted it.. I wonder if I have access to [pre] or [table] tags...

  4. #14

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    Quote Originally Posted by Absinthe View Post
    How about if we go with the golden ratio then you could have something like this:
    IIRC, the Golden Ratio is about 1.67:1, isn't it?

    If so, isn't it interesting how close that is to the 1.5:1 of a 35mm frame?

  5. #15
    Ole
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    Quote Originally Posted by Paul Verizzo View Post
    IIRC, the Golden Ratio is about 1.67:1, isn't it?
    It's 1.618:1, which is the same as 1:0.618.

    The metric "A" serie for typing paper etcetera is defined as A0=1 square meter, A1=1/2 of that and so on, with the proportions such that each halving retains the rame proportions. That gives a ratio of 1: sqrt(2).

    But those are logical, which the photo paper sizes are not. Even in Europe the paper sizes are illogical - and what's worse, we get two sets of them:

    9x12cm, 10x12cm (4x5"), 10x15cm, then 5x7" and 13x18cm are the same. The next one is 8x10" (imperial) or 18x24cm (metric). Then comes the purely metric 24x30cm, next 11x14", 30x40cm and so on ad nauseam.

    Looking at glass plate era cameras it's obvious that these were standard plate sizes, which implies that the standard paper sizes have been made to fit the plates.
    -- Ole Tjugen, Luddite Elitist
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  6. #16

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    Thanks for the correction.

    Quote Originally Posted by Ole View Post
    It's 1.618:1, which is the same as 1:0.618.

    But those are logical, which the photo paper sizes are not. Even in Europe the paper sizes are illogical - and what's worse, we get two sets of them:

    Looking at glass plate era cameras it's obvious that these were standard plate sizes, which implies that the standard paper sizes have been made to fit the plates.

    OK, I was off by 7%.

    Good observation about the old glass plates. Now, of course, the question is how did that size originate? Letter paper of the era?

    And whatever happened to 4x5, handily contact printing all those Speed Graphic negatives? I presume the need went the way of the Speed Graphic and 4x5 view camera users just aren't a big enough market.

  7. #17

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    While we are at it, what ever happened to 10x13 I seem to remember that years ago, but have not seen it at all lately...

  8. #18

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    Does A4 wet darkroom paper owe its existence to the arrival of inkjet printers? When did it start? I can't think why there should be a connection but it just seems quite a coincidence. Maybe it was produced to rival what is the common size for inkjet printing? It's still a size that isn't common and I suspect isn't used a lot. Ilford do some A4. Compared to the usual price of 8x10 you'd need to like it a lot to buy it as it is much more expensive than 8x10 proportionally speaking. The one big advantage I can think of is that it allows for two 5x7.5 prints with borders which 8 x10 doesn't.

    pentaxuser

  9. #19
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    I am starting to see more and more frames that are designed for 8.5" x 11" (digital) photos. I would expect that if A4 (digital) prints are the UK or European equivalent to 8.5" x 11", then you might see the same effect there. Paper sizes may very well follow the display and presentation sizes, as they change.

    Matt

  10. #20
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    Quote Originally Posted by Absinthe View Post
    Maybe this is more like, why are manhole covers round? Because manholes are round (and yes I know round is the shape that can't call in it's own hole)
    Manhole covers are round for a very good reason: so that it's physically impossible for them to fall in the holes they cover. A square cover could fall in on the diagonal.

    OOPS! I got lost by the typo "can't FALL in it's own hole"
    Last edited by Mateo; 03-19-2008 at 08:09 PM. Click to view previous post history.
    "If I only had a brain"-Some badly dressed guy made of straw in some movie I think I saw

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