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16mm camera lenses 35mm camera (1.6x) equivalent. Director's Viewfinder project.


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#1 Vadim Trofymenko

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Posted 13 January 2013 - 04:16 PM

Hi, I'm using 16mm camera and thought it would be nice idea to use a canon dslr (550D, 1.6 crop) to frame my shots. Since good viewfinders for framing are quite expensive now. DSLR is perfect choice as it takes various lenses.

On my 16mm cine camera I have a zoom lens with following focal lengths:
10mm
15mm
20mm
25mm
30mm
40mm
50mm
60mm
70mm
80mm
100mm

Can anybody tell me please equivalents of this focal lengths to canon 1.6 crop?

For example, I had a look through 18mm canon lens on canon 550d with 1.6 crop and picture looks like 10mm on the 16mm cine camera. So is the difference 8mm between them, or what?
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#2 Vadim Trofymenko

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Posted 13 January 2013 - 04:25 PM

Sorry folks my mistake!

18mm = 29mm on 1.6 crop sensor.
10mm = 10mm on 16mm movie camera.
So it's 19mm difference between them right?
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#3 Vadim Trofymenko

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Posted 13 January 2013 - 04:40 PM

Need somebody to check this, is it correct?

16mm camera canon 1.6 crop full frame
10 29 18
15 34 21
20 39 24
25 44 27
30 49 30
40 59 36
50 69 43
60 79 49
70 89 55
80 99 61
100 119 74
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#4 Alan Rencher

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Posted 13 January 2013 - 06:44 PM

http://www.abelcine.com/fov/
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#5 Vadim Trofymenko

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Posted 13 January 2013 - 06:51 PM

My math is rusty, but I think I finally got it. Let's take 30mm lens as a example.
Super 16 aperture =14mm.
30/14=2.2
2.2x30=66 (full frame 30mm)
66/1.6=41mm on ASP-C sensor! Got it suckers!))

Results:
Super 16 = 30mm
APS-C=41mm
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#6 Vadim Trofymenko

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Posted 13 January 2013 - 06:56 PM

http://www.abelcine.com/fov/


Alan, tool you've linked just compares cameras and focal lengths, but not calculates changes.

Edited by Vadim Trofymenko, 13 January 2013 - 06:57 PM.

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#7 Alan Rencher

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Posted 13 January 2013 - 06:59 PM

It tells you your field of view. That's what you're looking for, right?
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#8 Vadim Trofymenko

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Posted 13 January 2013 - 07:00 PM

Yes but on completely different cameras. In short, I need same view from two cameras: Super16 and APS-C
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#9 Alan Rencher

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Posted 13 January 2013 - 07:09 PM

Well, according to that chart, S16mm is about half the size of APS-C. So if you are using a 10mm lens on a S16, the chart says you have a 61.7° field of view. If you compare that to APS-C, the same lens has a FOV of 98.9°. Now, to get close to that same FOV (61.7°) on the APS-C sensor, you will need to use a 20mm lens (it will actually get you a FOV of 60.6°, but who's counting.) It's all in the chart.
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