webrunner5 Posted September 6, 2018 Share Posted September 6, 2018 48 minutes ago, majoraxis said: With daul native ISO's it should have the most dynamic range at ISO 400 and ISO 3200 - correct? So the assumption is shooting at ISO 100 would reduce the dynamic range and the noise by the same amount - 2 stops? Hmmm... I would like to see some tests that illustrate the reality of this assumption or disprove this assumption relationship between ISO and dynamic range. 400 ISO is the BMPCC 4K's native ISO. if you go below that in video you are loosing DR. Just like SLog in a Sony A7s. Anything below 3200 ISO and you are loosing DR on the original. That is it's native ISO for video. So yeah you are loosing out DR wise at 100 ISO for video. Even for a frame grab in stills. Emanuel 1 Quote Link to comment Share on other sites More sharing options...
Anaconda_ Posted September 6, 2018 Share Posted September 6, 2018 1 hour ago, majoraxis said: Hmmm... I would like to see some tests that illustrate the reality of this assumption or disprove this assumption relationship between ISO and dynamic range. I posted it before, but this might help. https://youtu.be/hWZ-wlikEnE Quote Link to comment Share on other sites More sharing options...
majoraxis Posted September 6, 2018 Share Posted September 6, 2018 The assumption I was questioning is if there is a equal relationship between shooting two stops lower and actaually loosing the same number of stops of dynamic range. The post stated that shooting at ISO 100 and you will loose 2 stops of DR. Tests will show if this is actually the case... also because of the lower noise floor st lower ISOs you could underexpose a bit and bring it back in post, which would compensate for loosing some dr/headroom in the highlights. Quote Link to comment Share on other sites More sharing options...
seanzzxx Posted September 6, 2018 Share Posted September 6, 2018 9 minutes ago, majoraxis said: also because of the lower noise floor st lower ISOs you could underexpose a bit and bring it back in post, which would compensate for loosing some dr/headroom in the highlights. Yeah, but now you are just doing what would happen if you exposed at (let's say) 400 normally, instead of 100. Between ISO 100-800 no gain is applied by the sensor, only the curve is shifted. In raw this doesn't matter, because you CAN underexpose at ISO 100 and just apply the 400 curve without losing anything. However, due to the compression applied by prores (which is pretty good, don't get me wrong), you'll likely have less shadow detail/more noise when you pull up ISO 100 in post to match ISO 400 as opposed to just having shot at ISO 400 to begin with. Jonesy Jones 1 Quote Link to comment Share on other sites More sharing options...
majoraxis Posted September 6, 2018 Share Posted September 6, 2018 @seanzzxx great explanation - that makes sense. Thanks! seanzzxx 1 Quote Link to comment Share on other sites More sharing options...
seanzzxx Posted September 6, 2018 Share Posted September 6, 2018 You're welcome, although I did get one fact wrong: no gain is applied to the sensor from the ISO 100-1250 range (as opposed to 100-800). Quote Link to comment Share on other sites More sharing options...
IronFilm Posted September 6, 2018 Share Posted September 6, 2018 11 hours ago, RWR said: I know it's all pre-pro teasers etc at this point, but..wonder if anyone's tried the audio/timecode features. Sadly I've seen nothing about this ? Quote Link to comment Share on other sites More sharing options...
emielregis Posted September 6, 2018 Share Posted September 6, 2018 Another video from BMPCC 4K Probably my favorite so far. Snuff 1 Quote Link to comment Share on other sites More sharing options...
Kieran Posted September 6, 2018 Share Posted September 6, 2018 23 minutes ago, emielregis said: Another video from BMPCC 4K Probably my favorite so far. Dubious about this. It includes footage from his previous upload in April. Quote Link to comment Share on other sites More sharing options...
emielregis Posted September 6, 2018 Share Posted September 6, 2018 2 minutes ago, Kieran said: Dubious about this. It includes footage from his previous upload in April. Oh. You're right. Then definitely a fake. Quote Link to comment Share on other sites More sharing options...
mechanicalEYE Posted September 6, 2018 Share Posted September 6, 2018 25 minutes ago, emielregis said: Oh. You're right. Then definitely a fake. Definitely fake, but at least you liked it. Emanuel 1 Quote Link to comment Share on other sites More sharing options...
Trek of Joy Posted September 6, 2018 Share Posted September 6, 2018 I would guess at this point anything not coming from Blackmagic is clickbait fakes. Preorders have undoubtedly gobbled up the first few months of production, perhaps longer. They're going to sell them as fast as they can crank them out for awhile. The P4k certainly doesn't need a blogger junket like the EOS-R to convince people to buy, it looks flat out amazing. Chris Emanuel 1 Quote Link to comment Share on other sites More sharing options...
Myownfriend Posted September 6, 2018 Share Posted September 6, 2018 1 hour ago, Trek of Joy said: I would guess at this point anything not coming from Blackmagic is clickbait fakes. Preorders have undoubtedly gobbled up the first few months of production, perhaps longer. They're going to sell them as fast as they can crank them out for awhile. The P4k certainly doesn't need a blogger junket like the EOS-R to convince people to buy, it looks flat out amazing. Chris The video taken at the Seoul Zoo wasn't uploaded by BMD but was confirmed legitimate by BMD and the person who filmed it took a picture of the Pocket 4K setup that they used. Quote Link to comment Share on other sites More sharing options...
Shirozina Posted September 7, 2018 Share Posted September 7, 2018 Does it have 10bit internal in ProRes? I can't see anything in their specs to say this apart from 10bit via HDMI. The data rates look rather low for 10bit as well. I just assumed it would have 10bit internal but........ Quote Link to comment Share on other sites More sharing options...
IronFilm Posted September 7, 2018 Share Posted September 7, 2018 BMPCC4K does ProResHQ internal. (10bit 422) Quote Link to comment Share on other sites More sharing options...
Shirozina Posted September 7, 2018 Share Posted September 7, 2018 3 minutes ago, IronFilm said: BMPCC4K does ProResHQ internal. (10bit 422) That is the assumption but why no mention in the specs and why the low data rates in the specs? Quote Link to comment Share on other sites More sharing options...
Myownfriend Posted September 7, 2018 Share Posted September 7, 2018 8 minutes ago, Shirozina said: That is the assumption but why no mention in the specs and why the low data rates in the specs? They aren't low, those are the standard bit rates of ProRes at those resolutions and frame rates. The bit rates are all listed in megabytes per second not megabits. I think they didn't specify because I guess ProRes is usually at least 10-bit and probably because no Blackmagic camera has ever recorded in 8-bit so they may have wrongfully assumed that everyone knew already. Quote Link to comment Share on other sites More sharing options...
Snuff Posted September 7, 2018 Share Posted September 7, 2018 BMPCC4K Footage "Bubble Gum" filmed with Blackmagic Pocket Cinema Camera 4K RAW 3:1 4K DCI 24fps Project / 60fps Off-Speed ISO 400, 1250, 3200, 5000 Samsung T5 SSD through USB-C DJI Ronin-S Metabones EF to MFT T Speedbooster XL 0.64x Shot with Contax Zeiss MM primes: 35/f2.8, 50/f1.4, 85/f1.4, 135/f2.8 95% Ronin-S / 5% handheld. jbCinC_12, Juxx989, mercer and 2 others 5 Quote Link to comment Share on other sites More sharing options...
Shirozina Posted September 7, 2018 Share Posted September 7, 2018 Thanks - yes it's bytes not bits. Pretty sure my BMPCC had an 8bit option for ProRes though? Quote Link to comment Share on other sites More sharing options...
Anaconda_ Posted September 7, 2018 Share Posted September 7, 2018 18 minutes ago, Snuff said: DJI Ronin-S 95% Ronin-S / 5% handheld. I'm keen to know if the Ronin S can control the focus of the P4K. Does anyone know? I love the proof of authenticity at the end of that clip, hilarious... but what about this? Tried too hard to rescue the sky in post? Quote Link to comment Share on other sites More sharing options...
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