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    PMW-F55 Sensor Details
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    Note: This is PMW-F55, not PXW-Fs5

    Background:

    The F55 sensor from the best information I can find is:

    24mm x 12.7mm
    17:9 aspect ratio
    11.6 mp total
    8.9 mp effective pixels

    The 8.9mp "effective pixels" is said to be a 4k-DCI crop of the total pixels, 11.6mp.

    I've done the math, if you want to participate you do the math.

    Bottom line:

    If true the 8.9 is a crop, then it's a 1.82 crop of the full frame (36mm x 24mm) image circle. I don't believe the crop factor can be that much. That's more than half way to micro 4/3.
    On the other hand, if the sensor is over sampled 4k DCI, the crop factor is in line with other S-35 sensors from Red, Canon, Arri.


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    #2
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    FWIW, there are a few full frame cameras that have ~1.8x 4K crop (mostly from Canon and Nikon).


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    That's interesting.


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    Quote Originally Posted by NorBro View Post
    FWIW, there are a few full frame cameras that have ~1.8x 4K crop (mostly from Canon and Nikon).
    Not sure which cameras exactly have the 1.8 4k crop, but I ran some numbers anyway for R5 and R6.

    R5: 4k UHD crop at 1:1 pixel = FF crop factor 2.29
    R6: 4k UHD crop at 1:1 pixel = FF crop factor 1.55


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    #5
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    So the R5 and R6 numbers even though it looks okay for R6, are not because instead of 1:1 pixel crop is based on 5.1k or 5.1k 94% oversample.


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    The 5D Mark IV and EOS R from Canon. I'd have to find the Nikon.

    But I'm not sure what you mean about the R5...there is no crop in FF? (But there's a separate S35 mode.)


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    Quote Originally Posted by NorBro View Post
    The 5D Mark IV and EOS R from Canon. I'd have to find the Nikon.

    But I'm not sure what you mean about the R5...there is no crop in FF? (But there's a separate S35 mode.)
    I wasn't sure, was only figuring it as if it did have a crop. Since it doesn't, just ignore it. And since the R6 uses 94% of a 5.1k sensor area, it would have to be recalculated as well.

    I'm looking to understand the discrepancy of the F55 in the first post. You had said some FF cams had a 1.8 4k crop. If they did, it should not be a "S-35" crop.


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    It's not...it's a 1.8x crop or around there for the two mentioned above (and a few others, but it's rare).

    Then other cameras are full-frame (or very close) with S35 crop modes (or very close).

    Anything around 1x is considered FF, 1.5-1.6x S35, and anything above that is when people start talking about the camera having a "crop" (which is usually a bad thing like with the 5D Mark IV which caused major disappointment).

    With MFT it's of course expected.

    Sony made millions (I presume) by offering FF 4K (with other limited specs) very early in this game.


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    Quote Originally Posted by Tom Roper View Post
    Bottom line:

    If true the 8.9 is a crop, then it's a 1.82 crop of the full frame (36mm x 24mm) image circle. I don't believe the crop factor can be that much. That's more than half way to micro 4/3.
    On the other hand, if the sensor is over sampled 4k DCI, the crop factor is in line with other S-35 sensors from Red, Canon, Arri.
    Well the math took me rather longer than I'd care to admit, but if the 8.9m pixels is a crop of the 11.6m, and the 11.6m are located within the 24x12.7mm surface area, then the crop factor would be approx 1.71x (not 1.82x).

    The question is whether 24 x 12.7mm is the total or active area of the sensor?

    I might dig a little deeper into this.


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    Quote Originally Posted by Grug View Post
    The question is whether 24 x 12.7mm is the total or active area of the sensor?
    This has to be the answer, that it's the active area of the sensor, which also makes the pixel pitch 5.9 micron and the CF S-35.


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