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    #11
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    At the end of the day, all that matters is knowing what a 10mm, 14mm, 28mm, 50mm etc will look like on any given sensor. If it helps some people to compare it to shooting FF, then fine, whatever works.
    Adrian


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    #12
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    Here's a visual diagram that illustrates how the GH-2 sensor area is wider for 16:9 format shooting, compared to 4:3 format shooting. In 16:9 mode the GH-2 has a crop factor of 1.86 compared to a Full Frame 35mm Still Photo camera ( like the 5D MK2 ) which crops it's sensor when shooting 16:9 format.

    Always keep in mind that the 35mm Full Frame Still Photo Camera format ( Canon 5D MK2 ) is a MUCH larger size than the 35mm Motion Picture Camera format.

    The APS-C format size ( Canon T3i / 60D / 7D ) is almost the same as the Super 35mm Motion Picture Camera format, and thus the crop factor for the GH-2 becomes pretty meaningless in terms of 35mm Motion Picture formats.

    GH-2 Sensor Diagram ( on the right side )


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    #13
    Senior Member Phenixone's Avatar
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    Ton't forget that this is compared to a Still camera 35mm. The film camera 35mm have a smaller gate.
    http://www.dvxuser.com/V6/showthread...and-Micro-4-3s
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    #14
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    Taking into account the GH2 sensor diagram showed in previous post the GH2 frame will be 18.8mm x 10.6mm for 16:9 video.
    So the diagonal will be: 18.8 x 18.8 + 10.6 x 10.6 = 465,8 SQRT = 21,58
    The Full Frame 35mm still is 36 x 24mm, So the diagonal will be 36 x 36 + 24 x 24 = 1872 SQRT = 43,26
    So the GH2 crop factor will be 43,26 / 21,58 = 2


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    #15
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    I think the confusion is happening because aspect ratio is not being considered. A 35mm FF still camera has an aspect ratio of 3:2, HD video is 16:9, motion picture cameras support a wide variety of aspect ratios. You can compare diagonal dimensions and that will give you one ratio. If you standardize on an aspect ratio then different cameras will crop the image differently to achieve that aspect ratio. Then the comparison becomes the diagonals compared as cropped. For example, if you crop an academy 35mm frame (22mm x 16mm) to fit a 16:9 aspect ratio you get a 22mm x 12.4mm image. The GH2 has a 19mm x 10.7mm image (for video). If you crop the GH2 frame to match the 35mm academy frame you get an effective image size of 14.7mm x 10.7mm. Depending on which aspect ratio you are using, the ratio between image sizes will be very different.
    Last edited by cbrandin; 12-31-2011 at 10:13 AM.


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    #16
    Senior Member GrahamH's Avatar
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    Quote Originally Posted by Apefos Adapter View Post
    Taking into account the GH2 sensor diagram showed in previous post the GH2 frame will be 18.8mm x 10.6mm for 16:9 video.
    So the diagonal will be: 18.8 x 18.8 + 10.6 x 10.6 = 465,8 SQRT = 21,58
    The Full Frame 35mm still is 36 x 24mm, So the diagonal will be 36 x 36 + 24 x 24 = 1872 SQRT = 43,26
    So the GH2 crop factor will be 43,26 / 21,58 = 2
    Sigh .... not if the comparison you want to make is with the 5D shooting 16:9 video (which is often the context). TheDingo explains it clearly and correctly.


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    #17
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    We calculated 1.86x versus full frame years ago with the GH1. So 1.86 versus ff and about 1.46 I'm comparison to aps-c I'm video.
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    #18
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    would this be correct?
    5D sensor: 36 x 20.25mm, so 36 x 36 + 20,25 x 20,25 = 1706 SQRT = 41,3 / 21,58 = 1,914 (crop factor between GH2 and 5D both for 16:9 video)


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    #19
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    You're miscalculating how wide the actual 4/3 sensor is, which panasonic explains it's using for recording. Then, how tall the 5D actual 16:9 image is when recording. If I remember right the diagonal for 5D is about 32mm not the full 35/36. Gh2 should be about 18mm diagonal.

    That's about 1.8x
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    #20
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    For video crop compared to S35:

    AF100 under HDSLR
    http://www.abelcine.com/fov/

    May or may not be exactly the same as the GH2, but close enough.


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