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Robert Collins

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Everything posted by Robert Collins

  1. We know that TowerJazz didnt make the Nikon D850 sensor because TowerJazz doesnt have BSI tech yet and the Nikon sensor is BSI. From a TowerJazz press release. The partnership will allow TowerJazz to serve its customers with BSI technology in mass production, at competitive prices, starting in the middle of 2018. The new BSI technology is aimed to high-end photography, automotive, AR/VR, and other CIS markets. YCM provides the BSI processing for both 200mm and 300mm CIS wafers. Of the 3 manufacturers with BSI tech we have Sony, Samsung (but they dont seem to make large image sen
  2. I do have a personal theory. The spec for an MFT sensor measures 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm. And if Panasonic is using 17.3mm for 4:3, then based on the 'pixel specs' the GH5s sensor needs to be around 19mm wide. So the consensus is that Panasonic is using a sensor 'wider than MFT spec' in the GH5s. But this doesnt make a lot of sense to me - introducing a marginally wider sensor is an expensive proposition. Furthermore, you cant really have a partnership of many companies based on one sensor spec, that allows any of its companies to produce '
  3. You know when Samsung exited the ILC market, I thought it was a precursor to teaming up with either Nikon or Canon. In my view Sony enjoys a competitive advantage in cameras because it is an electronics company in a business where cameras are rapidly turning into electronics products (a bit like telephones). And Samsung has shown (and certainly has the tech) that it is the one company that can easily out Sony, Sony. I still think that say a Samsung/Nikon partnership makes so much sense. Samsung would bring Nikon all the bleeding edge sensor, sensor af, processing and Nikon would bring its
  4. I think you are taking the original post rather out of context (it doesnt say throw away your Sony glass.) A lot of video shooters using Sony are coming from Canon and have a lot of Canon glass including Sigma EF which they are adapting to Sony. The point of the post is that the Sigma adapts better. Others use multiple cameras and like Canon glass because it can be adapted to M43, Sony or used with Canon - Sony lenses cannot be adapted to other formats. Sony lenses are pretty much certain to work better for af than adapted glass because they are designed for both cdaf and pdaf and for Son
  5. Most likely it is just the way that people are calculating the crop factor. The crop factor for M43 is 'considered' to be 2.0. But it is a 4:3 sensor while a 35mm sensor is 3:2. The crop factor is based on the diagonal but there is more of a crop on the width and less of a crop on the height with a 4:3 sensor. As in crop factor width = 36/17.3 = 2.08x And crop factor height = 24/13 = 1.85x
  6. My guess would be that there isnt enough 'extra' in Sony's latest tech to make it worth the hassle and expense of making a new sensor. If you look at DXOmark both the Sony sensor and Nikon (Sony) sensor have the same '100' score, so the benefits of the Nikon sensor are presumably fairly marginal. Sony could probably have eked out an extra point or so but the current sensor is hardly old tech especially as it has had a couple of tweaks. So Sony focused on the myriad of other upgrades (many of which were needed) and upgraded the LCD, EVF, speed, focusing, battery and a host of other feature
  7. Thanks. You do get a choice of 'color modes' when shooting HLG - either BT2020 or 709.
  8. So help me out here. I am really interested in the HDR HLG profile(s) on the A7riii. I am not really looking to make HDR footage for oled TVs - what I am looking to do is a 'picture profile' that lets me get good dynamic range and colors in a format that suits me. I do know of the advantages of s-log2 and s-log3 but I am a still shooter primarily (that is getting into video) and the whole minimum iso800 (+1.5 EV exposure) isnt exactly conducive to switching between stills and video. a big (potential advantage) for me of HDR HLG is that you can shoot at iso100 and expose normally.
  9. Here's some sales data (from BCN) showing top 20 camera sales in Japan last July. Canon has 4 mirrorless in the top 20 (mirrorless + DSLR) while say Sony has 2. And it is very easy to see why. Canon sells an M10 with 2 lenses for as little as 50,000 yen while Sony's entry level offering - a6000 (a 4 year old camera) + 2 lenses is 50% more expensive at 75,000 yen. Hardly surprising then that Canon had a higher market share than Sony in mirrorless in 2017 in Japan. Canon simply offers a much better value offering (and value beats out bells and whistles every time.) And its not ju
  10. Actually the display all info page on the A7riii doesnt show the video settings when in PASM unlike the A7rii which does. See pic.
  11. No he didnt test the sensor readout for video. But we know (for the A9) it is much lower than for stills - in fact by the rolling shutter tests I have seen, the readout is the same as the A7riii. So did Sony intentionally cripple the A9 for video (quite probably) and was the reason they didnt include picture profiles because they deliberately didnt want people buying the A9 for video expecting that the fast electronic shutter would lead to less rolling shutter (again quite possible but just guessing.) Still if a 24mp A7siii or a 12mp A7siii takes advantage of the incredibly fast
  12. http://blog.kasson.com/ This engineer has done extensive testing of the readout speed of Sony sensors. A7r2 1/15 second A7r3 1/30 second A9 1/160 second but only in stills (not in video) (which could be very interesting in terms of the A7siii) In terms of your above comment, he tests full sensor readout for stills. So the readout for a proportion of the sensor could be faster (I guess.)
  13. You could well be right. I wasnt speaking from experience but from what I had read in Gary Friedman's 708 page epic on the A7riii. 'The maximum bitrate you can choose for SD-stored 4K is 100 Mbps, whereas for external recorders you can record your video at about 147 Mbps.' He does occasionally get things wrong.
  14. BTW I thought I would throw in the A7riii and A7rii comparison here because the difference is so striking (in FF video). I am not sure I see or understand where Sony found 3 extra stops of lowlight performance out of the same sensor,
  15. I could be wrong but I think the maximum external recording for the A7riii is 147Mbit (compared to 100Mbit internal.)
  16. My feeling is that 'intellectual' works better in a subscription model like Netflix than in the Cinema. We see that 'intellectual' like some TV series or documentaries dont attract high audience figures but they do tend to inspire loyalty to the channel brand and anchor subscriptions. So on that note, we dont know 'how much' Netflix is paying Paramount 'NOT' to release it in the Cinema. Afterall Netflix spent over US$50m making 'Okja' last year (which I thought was excellent.) Anyways, it is useless blaming 'bean counters' and 'studio executive' or 'youtube' when they are simply catering
  17. The footage shows the 'A7rii' or the 'A7sii'? It is marked 'A7rii' in the video (apart from the Vimeo headline that mentions A7sii). But the commentary talks about A7sii v A7riii and the others.
  18. I think this test for follow focus isnt great. The GH5s uses CDAF only (contrast detect) and the point of highest contrast is the action figures eyes - so it isnt likely to stray. Now if he moved around the 'hammer' instead of the action figure and it followed focus I would be more impressed but my guess is that as the hammer got close to the action figure it would stray to the action figure.
  19. I can see that the adapted Sigma lenses work incredibly well with the A7riii with 'center focus' but how about 'wide af'?
  20. Well apparently we are using exactly the same source (ie DPreview) to show differing things. The specs say they have the same size sensor, the blurb says that the sensor is 'oversized'. However if it is oversized, it is oversized by 6.7% in area which isnt a lot - not much of a trade off for ibis. In contrast the A7riii is oversized by 300%.
  21. This is quite a bold statement you have made but is it true? I mean a couple of people have stated on this forum that the GH5s cant have IBIS because it has a 'bigger sensor' (and there isnt room for the ibis.) Well actually the sensor is exactly the same size in the GH5s as the GH5 so that cant be it. It might be an overheating issue but I doubt it with that sized body and sensor. It could well be a cost of build issue and Panasonic's belief that the 'target market' wouldnt be prepared to pay for ibis. Could be but I question Panasonic's judgement here. And let's face it Panasonic h
  22. I seriously doubt it. The multi-aspect sensor is how the pixels are distributed and not the physical size of the sensor. The GH1 had a multi-aspect sensor and it had exactly the same size sensor as all the other M43 cameras. It was sporting an extra 100,000 pixels though.
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