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manufilm

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About manufilm

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  • My cameras and kit
    Canon T2i, Canon 5D Mark II, Sony A6300

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  1. I'm wondering, did you use v1.0 or v1.10 of the firmware?
  2. For me, the A6300 has never overheated in a studio setting (Arri Fresnels generating a lot of heat) and doing up to 20 minute takes in 4K. My main concern was the battery dying every hour or so. I had a T2i which I brought one time to the studio and after 20 seconds or so it would overheat and shut off. I did do a test once to see how long it would take to overheat and it took 56 minutes with firmware v1.0 (not v1.10). It could be due to sample variation why there are A6300s out there with heat issues.
  3. The a6300 firmware used in the test wasn't mentioned? In this test, firmware v1.10 (overheating fix) never overheated (over 2 hours of testing) when shooting in the shade at 26 degrees Celsius. (Still overheats on a hot day in direct sunlight): https://www.youtube.com/watch?v=7qLGSFCpBEA
  4. The X-T2 sensor width is 23.6 mm and Full frame is 36 mm (1.525x crop factor). The additional crop factor is 1.17x for 4K (which is multiplied not added): 4K crop 36.0/23.6 *1.17 = 1.78x The figure 1.75x is technically incorrect. The calculation people use is 1.5x1.17 = 1.75. This calculation has to be rounded to two significant figures (high school science) so would have to be expressed as ~1.8x.
  5. DCI 4K @ 237 Mbps and much better rolling shutter performance according to the PR.
  6. 20/20 vision is 60 pixels per degree. Yes, human vision on average is really 20/15 or 85 PPD. There was a calculator posted on Reddit where people noted, that although people could strain/focus their eyes on individual pixels to resolve above ~60 PPD, it was uncomfortable to do for an extended amount of time as eye fatigue sets in. Why would you be focusing on individual pixels and not the whole image anyway? The practical (comfortable) limit is probably ~60 PPD. Calculator to test your eyes: http://jsfiddle.net/w5se983j/3/ Human vision: 180 degrees horizontal and 134 degrees vertical FOV or 10800x8100 to achieve 60 PPD. VR headset: 110 degree FOV: 6600x6600 per eye to achieve 60 PPD.
  7. I did say the pre-5D3 use line skipping (pixel binning horizontally, pixel skipping vertically) This has been posted online and tested by others. The 3x3 or 3x5 read modes are based on the options available by using Magic Lantern firmware.
  8. From my experience with using Magic Lantern, and understanding of Canon cameras either do: Canon 5D Mark IV/1Dc/1DX Mark II 4K: 1x1 (4K center crop) Canon 5D Mark II/7D/T2i/70D and other 1080p Canon cameras released until 2014 (except the 5D Mark III): 3x3 (pixel binning horizontally, pixel skipping vertically, slight upscale) moire/aliasing/scaling artifacts - Canon 5d Mark II: 1872x1053 effective upscaled to 1920x1080 - Canon 7D/T2i: 1728x972 effective upscaled to 1920x1080 - Canon 70D: 1824x1026 effective upscaled to 1920x1080 Canon 5D Mark III/IV/1DX Mark II/7D Mark II/80D 1080p: 3x3 pixel binning - 5d Mark III and most other Canon cameras since 2014 (better moire/aliasing and ISO performance than using pixel skipping) - 5D Mark III (1920x1080 effective) sensor resolution chosen to avoid upscaling (5760/3=1920) - 7D Mark II/1DX Mark II: 1824x1026 effective upscaled to 1920x1080 - 80D: 2000x1125 downscaled to 1080p (my guess) - 5d Mark IV: 2240x1260 downscaled to 1080p (my guess) Canon 720p Modes: 3x5 (pixel binning horizontally, pixel skipping vertically) The Canon 5DS(r) is probably using 3x3 pixel binning: 2880x1620 resolution downscaled to 1080p (which happens to be the exact resolution of the Arri Alexa!)
  9. The studio charts on dpreview show how strong the aliasing/moire is using FF vs S35 on the A7RII. (They have also updated it with the XT-2): https://www.dpreview.com/reviews/image-comparison/fullscreen?attr29_0=sony_a7sii&attr29_1=sony_a7rii&attr29_2=sony_a7rii&attr29_3=sony_a6300&attr72_0=4k&attr72_1=4k&attr72_2=4k-apsc&attr72_3=4k&normalization=full&widget=378&x=-0.003759398496240741&y=0.0110314396028683 https://www.dpreview.com/reviews/image-comparison/fullscreen?attr29_0=sony_a7sii&attr29_1=sony_a7rii&attr29_2=sony_a7rii&attr29_3=sony_a6300&attr72_0=4k&attr72_1=4k-apsc&attr72_2=4k&attr72_3=4k&normalization=full&widget=378&x=0.22088384225870783&y=-0.5714285714285713
  10. The full height of the sensor is not used, the aspect ratio of the sensor is 3:2 or 1.5. The aspect ratio used for 4K DCI is 4096/2160=1.896: Sensor resolution for full frame video: 6720 x (6720/1.896) or 6720 x 3544 4K crop diagonal.. i.e. sqrt of (6720^2 + 3543.75^2) sqrt(6720^2 + 3543.75^2)/4630.64 = 1.64x
  11. It is 1.64x if you shoot 1.9:1 or wider. You crop in for 16:9 (1.75x) and 1.85 (1.68x).
  12. In their 1Dx Mark II review, dpreview posted this four-way comparison chart of the color resolution targets for 4K/24p of the 1Dx Mark II, D5, GH4 and A6300. The A6300 out resolves every still camera in their database that I checked including the XC10 thanks to the 6K to 4K downsample (the A7R II S35 5K downsample looks good as well, but soft). The 4K/30p crop mode is pretty competitive with the other cameras as well: https://www.dpreview.com/reviews/image-comparison/fullscreen?attr29_0=canon_eos1dxii&attr29_1=panasonic_dmcgh4&attr29_2=nikon_d5&attr29_3=sony_a6300&attr72_0=c4k&attr72_1=4k&attr72_2=4k&attr72_3=4k&normalization=full&widget=378&x=0.204879165&y=-0.578839
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