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Type: Posts; User: Lpowell

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  1. Replies
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    GH5 The AF100 had the worst motion picture quality of...

    The AF100 had the worst motion picture quality of any Panasonic MFT camera I have owned. Its ISO performance was no better than the GH2, its low-light contrast sucked, and its edge details were full...
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    GH5 The entire Northrup video is nothing but...

    The entire Northrup video is nothing but provocative clickbait. Northrup's pretense of technical authority has suffered many self-inflicted debacles in his past few years of YouTube notoriety. My...
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    GH5 That "horrendous distortion" is a property of the...

    That "horrendous distortion" is a property of the lens, NOT a failing of the camera that makes no attempt to conceal it.
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    GH5 Ultra wide angle lenses tend to have noticeable...

    Ultra wide angle lenses tend to have noticeable geometric distortion, approaching that of fish-eye lenses. It's not surprising to hear of focus field distortion as well, particularly at the fastest...
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    GH5 I think a strong case can be made that it's the...

    I think a strong case can be made that it's the 1/48th-second motion blur of 24p cinema that contributes the most to "the film look". The 24 fps cadence argument seems much weaker for two reasons....
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    GH5 Working directly with linear RAW data is...

    Working directly with linear RAW data is practical for still photos, they aren't excessively large. With video, linear RAW occupies too much storage space, restricting your maximum capture duration....
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    GH5 Downsampling from 4K to 1080p effectively doubles...

    Downsampling from 4K to 1080p effectively doubles the chroma resolution, which is roughly comparable to 4:4:4 color. With the luma channel it makes up for the lack of sharpening in the source...
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    GH5 LOL, that's quite a strawman you've conjured up....

    LOL, that's quite a strawman you've conjured up. If your grading skills are even half as impressive, I've no doubt you can craft a masterpiece, VLog L not withstanding.

    But nope, I most often...
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    GH5 There are subtle dimensions of grading quality...

    There are subtle dimensions of grading quality that are hidden beneath the concept of "dynamic range". I think we'd all agree that the constricted DR of Rec 709 crushes both highlight and shadow...
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    GH5 What's obvious from ungraded VLog L footage is...

    What's obvious from ungraded VLog L footage is that it starts out with extremely low contrast and saturation. That gives it a bleached, milky cast that's difficult to completely eliminate. This makes...
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    GH5 I can always spot a VLog L clip, no matter how...

    I can always spot a VLog L clip, no matter how it's graded.
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    GH5 For those still interested, here's what actually...

    For those still interested, here's what actually happens when you use "extended ISO" on any digital camera. The image sensor contains millions of photoreceptors that convert captured photons into...
  13. GH4 After two attempts at factory cleaning of the...

    After two attempts at factory cleaning of the oil-stained sensor in my out-of-warranty Nikon D600, Nikon replaced the camera with a refurbished D610, at no charge and with a one-year warranty. I've...
  14. GH5 Makes sense as 4:2:2 is an asymmetrical format...

    Makes sense as 4:2:2 is an asymmetrical format that provides both half-resolution chroma channels on each scanline It was originally used back in the Super-VHS/Betamax era to digitize interlaced...
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    GH5 You're welcome.

    You're welcome.
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    GH5 130576 ...

    130576


    https://tech.ebu.ch/docs/tech/tech3335_s29.pdf

    I'm calling foul on this rigged artifice of "nominal 100% exposure". It is a completely aribitrary, optically meaningless reference point...
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    GH5 True, not coincidentally because it's an f2 lens....

    True, not coincidentally because it's an f2 lens. Of course, we can adapt f1.8 zooms to MFT and speedboost them down to less than f1.4. That's all good, but confirms f2.8 and below as MFT's sweet...
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    GH5 Granted, but DOF is far from the only...

    Granted, but DOF is far from the only consideration. With a FF sensor, f8 is right in the middle of an f2.8 zoom's 7-stop usable aperture range. With MFT, you're restricted to a 6-stop usable...
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    GH5 There's a flip side though on the far end of the...

    There's a flip side though on the far end of the aperture scale: narrow-aperture lens diffraction. With MFT sensors, sharpness isn't going to hold up past f11, so your lens really does need to stay...
  20. GH5 Just start numbering at zero, and it will all...

    Just start numbering at zero, and it will all work out.
  21. GH5 The point where the sensor saturates is "stop 0",...

    The point where the sensor saturates is "stop 0", all stops below that are numbered negatively. With a straight-line LOG proflie, there is no such concept as "the last stop before it clips"....
  22. GH5 The base level for dynamic range should actually...

    The base level for dynamic range should actually be the point of full saturation of the sensor, as that's the only absolute fixed reference level on the db scale. DR then extends downward from full...
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    GH5 The primary benefits to RAW are avoiding the...

    The primary benefits to RAW are avoiding the irreversible effects of burning in-camera white balance, debayering, and sharpening into the footage. The downside of RAW is its wasteful allocation of...
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    GH5 That won't work well on an MFT camera, because EF...

    That won't work well on an MFT camera, because EF lenses require active electronic adapters to provide aperture control (as well as auto-focus and IS features). As IronFilm points out, if you want a...
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    GH5 ...has absolutely NOTHING to do with either...

    ...has absolutely NOTHING to do with either Windows or Mac 10-bit display drivers. VESA standards are a relic of the DOS era of PC-compatible graphics. Apple and Microsoft provide built-in support...
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