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04-16-2014, 10:39 AM   #1
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Pentax 67 real aspect ratio?

Hi,

I always thought P67 means it has a aspect ratio of 6x7, using film area of 6cm (height) x 7cm (wide).
But when I scanned the negatives into LR, and when I set the crop ratio to 6x7, I found the scanned negative is wider than 6x7?
Tried to find online and found nothing, am I missing something?

Lee

04-16-2014, 11:13 AM - 1 Like   #2
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Measure the *actual* image size projected onto that roll of film. It is around 55x70mm which is, rounded off, a 4:5 aspect matching many old-school paper sizes here in the US.
04-16-2014, 12:16 PM   #3
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It is about 56x70mm. Typicllay, 6x7 is very few mm less wide, but that a really small difference!
04-16-2014, 02:03 PM   #4
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The Pentax 67 aspect ratio is almost exactly 4:5.
It prints a near perfect 8x10

04-17-2014, 06:38 PM   #5
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Indeed, that's why 6x7 was called ideal format since 8x10 paper was something of a standard even once most of the market (i.e. amateurs) had moved on from 4x5 (and 8x10) cameras. I was always surprised that there was little in the way of 8x12 paper available even though 35mm was dominant. Pentax made quite a point of demonstrating how much more a 6x6 negative would need to be enlarged for an 8x10 than a 6x7 negative.
04-18-2014, 06:35 AM   #6
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thanks guys for the answer!
04-18-2014, 07:38 AM   #7
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11x14

It just dawned on me, 5.5x7 is the same ratio as 11x14. I guess that's the closest thing to a traditional print size you'd need to avoid any cropping.
04-18-2014, 07:59 AM   #8
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QuoteOriginally posted by sbjornda Quote
It just dawned on me, 5.5x7 is the same ratio as 11x14. I guess that's the closest thing to a traditional print size you'd need to avoid any cropping.
Right, and approximately all the common print sizes of the camera's day. 8x10, 11x14, 16x20 and 20x24

04-18-2014, 08:24 AM - 1 Like   #9
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I am using the Tak 6 x 7 lenses on cameras with Graflex Rollfilm backs
RH10 is 10 of 58 x 67.7
RH8 is 8 of 57.4 by 77.7
(Compared to the P67 55 x 70 mm)

I like the 2:1 crop (eg 34 x 67.7) 48 bit tiffs with 2000+ x 4000+ pixels.

To get a paper print, I add top and bottom borders of a pale neutral color to fill up the height for the Office Depot paper size 11 by 14 inch.

And ask them not to crop the borders,then guillotine to size with an even border all round.
Office Depot here has some big pro printers and so far they do a good job, better colors than some of the others we used.
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