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androidlad

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Everything posted by androidlad

  1. Alexa is no longer the gold standard for non global shutter performance. It's Sony VENICE 2, it has 3ms rolling shutter. The latest Alexa 35 is 8ms, Alexa Classic and LF both ~7ms, Alexa 65 ~16ms.
  2. https://www.dpreview.com/news/6357713219/atomos-ceo-reveals-more-details-of-the-company-s-full-frame-8k-global-shutter-image-sensor
  3. 1. The pixel-level read node design is similar to IMX610, only the implementation is different and dictates that it has fast conventional read speeds. 2. The physical pixels are 49 megapixels and the entire sensor is natively designed to be 49 megapixels, reusing the 4.2um BSI pixel design and using both analogue binning and digital binning together to achieve a 12 megapixel sensor. 3. IMX510 disables the all-pixel readout mode, so there is no possibility of an all-pixel readout, and naturally it cannot achieve 2x2 OCL AF, which is the biggest difference between it and IMX472. 4. Dividing IMX510's logical pixel into four physical pixels. The readout is achieved using 1:2 analogue binning before PGA and digital binning after ADC. The specifics are: A. 48 physical megapixels, divided into upper left, upper right, lower left and lower right in-group pixels. B. 24 mega pixels are read, binned in the form of upper left + lower right, upper right + lower left, dual stream 14bit readout. C. 2:1 pixel binning in the digital domain to generate 12 megapixels at 15bit, discard 1bit to 14bit output. D. The readout speed is around 21ms, approximating 48fps; when the precision is reduced to 12bit, 96fps can be achieved. E. The ADC does not have an 11bit mode, so it cannot achieve the faster 24M 11bit -> 12M 12bit. F. The digital binning discards 1bit of precision regardless of the mode of output, a waste of performance deliberately designed into IMX510. G. In one video mode, the internal readout of two 3.84K/128fps 12Bit ADC streams are digitally binned, but the resolution is not twice that of 3.84K. The precision and resolution are wasted. 5. Due to the uniqueness of the readout mode, IMX510 cannot achieve any 2x1 OCL in-group AF, and the orthogonal readout pixel groups cannot be used for phase detection. Therefore the only phase focusing design for the IMX510 is masked PDAF. A focusing method using 2x2 OCL AF will only be available when the all-pixel readout mode is unlocked. 6. The hardware performance of the sensor goes well beyond the limitations of the "IMX510" name. 7. If this sensor were to be a normal Bayer sensor, the readout speed would depend only on the total number of analogue pixels before the ADC, due to the pixel readout design. Thus 48 megapixels at 24fps 14bit. For this a Modified Bayer CFA can be used, which is suitable for pixel designs with 2:1 analogue signal binning - maximising its performance and enabling dual mode switching between high resolution and oversampled high speed shooting: Crop to 16:9 to achieve 8.5K/57.7fps 12bit, 2x4.35K/115.5fps 12bit respectively; crop slightly to 7.68K/64fps 12bit, 2x3.84K/128fps 12bit. Notably, its 2x3.84K/128fps 12Bit readout truly has double the resolution and achieves IMX301-like oversampling performance (Sony F65RS). 8. The readout speed of any column-parallel ADC design of an image sensor must be scaled by the line readout speed, by the total number of pixels multiplied by the number of columns, and at the same level of precision comparing: A 48 megapixel 14bit 24fps sensor reads at a larger scale than a 12 megapixel 14bit 48fps sensor, but we cannot call it a greater total number of pixels read out, but rather a faster readout, measured by miliseconds. At a given precision, readout time (the time taken to read a frame), readout scale (how many pixels are read in a second), and readout speed (how many rows of pixels can be read in a second by a column of ADCs), are three dintinctly different and important metrics.
  4. Because the other advantage of the glass lens mod is that it has no distortion. The closest mode is "wide" that does not engage the software distortion correction (it's going to distort the already linear image if using "linear"). The slight zoom is only around 1.1x, the effect on softness and image resolution is negligible.
  5. Comparison of the glass lens mod and original plastic lens: The stock lens is evidently more hazy and less detailed, demonstrated here and by some of the face crops in a previous reply. Look at the power lines, poles and especially the inscription text.
  6. The stock lens on GoPro is plastic with evident haloing and softness. A third party all-glass lens mod is available (Hero 10 for now): https://www.peauproductions.com/collections/peaupro-cameras/products/peaupro14-gopro-hero-10-black-ribcage
  7. The Labs firmware allows for 2 to 200Mbps arbitrary bitrate configuration. However at maximum 200Mbps, the camera can lock up at times. It also works for previous generation Hero cameras as well.
  8. Great finding. But the "Smooth Skin Effect" is a blur effect only, it was added to GFX cameras a long time ago, it does not affect colour. Default is off and it has to be switched on.
  9. Thanks. There seems to be very little, if any, difference between X-H2s and X-T3 in this clip.
  10. androidlad

    Fuji X-H2S

    It also means that the F-log banding/colour botch issue still exists, also for F-log2.
  11. androidlad

    Fuji X-H2S

    Because the photosenstive layer of the new X-Trans V HS is essentially the same as X-Trans IV, hence their colorimetry is the same so F-log implementation was copied over.
  12. androidlad

    DJI leaks

    DJI Pro will be announcing a new camera product on 15 June:
  13. androidlad

    Fuji X-H2S

    It's not fake. Nobody said it IS the sensor of X-H2S, which is based on that sensor but with Fujifilm's customisation.
  14. Yes it would have been much better for the users, but Sony didn't go that route from an R&D and markerting perspective. Sony already has BSI 4.2um products, so it would be easier than developing 8.4um products from scratch. Not unlocking 48MP mode seems to be product segmentation strategy, no a sacrifice due to technical capability.
  15. The 7K readout has more noise to begin with. The difference in low light with modern FF sensors from Sony Semicon is very small.
  16. Pixel binning reduces read noise (1 readout instead of 4), hence those 100MP+ smartphone sensors output 12MP in lowlight. A7S3 essentially uses it as a locked down 12MP sensor. In other words, it performs just as good as same-gen higher pixel FF sensor in A1, there's no longer a need to sacrifice pixel count for low light performance. But if you compare it to A7S2 or original A7S, the noise performance at lower ISO did get worse, because the higher readout speed requires multiple parallel ADCs and this slightly increases read noise. But at higher ISO they share negligible difference.
  17. Pixel binning reduces read noise (1 readout instead of 4), hence those 100MP+ smartphone sensors output 12MP in lowlight. It's essentially used as a locked down 12MP sensor.
  18. Please eduate yourself: https://www.dpreview.com/videos/7940373140/dpreview-tv-why-lower-resolution-sensors-are-not-better-in-low-light
  19. Low pixel count cameras tend to be cleaner at high ISO because of the lower cumulative read noise. It has nothing to do with bigger pixels collecting more light. However, with the latest sensor design, it's doesn't alway apply any more. A1 for example, despite having 50MP, is slightly better in low light when shooting video compared to A7S III.
  20. Larger pixels don't gather more light. FF sensors are the same size at 36mm x 24mm, they gather the same amount of light with the same aperture.
  21. androidlad

    Fuji X-H2S

    The 14bit readout only gets you ~0.3 stops of additional DR compared to 12bit. Also 14bit readout is 10ms rolling shutter vs 5.6ms in 12bit.
  22. androidlad

    Fuji X-H2S

    X-H2S is a speed centric camera, it's the very first stacked APS-C sensor and also the fastest, which benefits both stills (action, sport, wild life etc.) and video.
  23. androidlad

    Fuji X-H2S

    1/180s 12bit readout speed (Film sim, F-log, F-log2 >30fps) 1/94s 14bit readout speed (F-log2 <30fps) It's the first cosumer camera to use 14bit readout for video, however the DR improvement is very little based on Gerald Undone's test (less than 0.5 stops improvement).
  24. It's called Grid Type in Z9 settings, there's one each for stills and video: https://onlinemanual.nikonimglib.com/z9/en/15_menu_guide_04_g11.html
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