Recent content by paulcurtis

I don't know whether this image shows correctly but see that the log curves have no rolloff in the highlights, so they will all clip when the container is full. And that clip *should* be the maximum value of that container. Anything else is wasting space and is implementation dependant. cheers paul

I couldn't see a thread for this already so http://www.sony.co.uk/support/en/product/ILCE-7SM2 That fixes the black spot issue (and it does) cheers Paul

Here are some comparisons. It's important to remember there's no magic here folks, the camera will output it's range into a variety of profile curves. Each curve has it's use. Remember that a log curve is a way to record scene linear light in a standard way that in vfx/post we can turn that...

He posts a CSV with 16 blocks of 64 values, so that's 1024 values in what appears to be a 1D LUT, so that's promising in terms of whether we can achieve different gammas. The LUT isn't a log curve though, it's almost linear. (image enclosed). It's not cine either. Those NLog images can't have...

I've made some adjustments to the LUT i was using, both to the black levels and the white. This is assuming you're importing the XAVC directly. https://www.dropbox.com/s/v9c56taj2p1ns6w/A7sII_Inventome_Slog2_SGamut3cine%200EV.cube?dl=0 Some comparisons. Mostly dull day, should be sunny...

Here's some more. First up is a straight comparison between A7s and A7sII Slog2/SGamut, you can see that the red is less orange. There are other subtle differences. I need to look at skin tests soon too. These are exposed up a little bit and there isn't a roll off on the highlights, this is...

Here are some initial dynamic range tests. What i am showing right now is the raw YUV data, the luma data from the externally recorded ProRes files. These are UHD recorded but down sampled to HD, including the A7s. I've not denoised them. This is the raw luma data in the file. Next i will...

Just a interim post, so you can see what goes on behind the scenes with compression. The screenshot below shows the U channel from the YUV. YUV is an encoding scheme that separates the luma from colour. The UV channels are a colour difference scheme, the UV channels are always very compressed...

Samuel, Here's a side by side of A7s and A7sII both at 3200. Both Slog2/SGamut. You can see clear differences for the reds. The two 50mm lenses flare differently hence exposure differences, the A7sII had a voightlander 1.5 and the A7s had the contax zeiss 1.4. Needless to say the A7sII looks...

One bit of news. If i look at a UHD -> 1080p Slog2 A7sII compared to the A7s Slog2 (same ISO 3200) there are no highlight artefacts on the A7sII version whereas there are on high contrast edges on the A7s. So that's a win for the MkII. Also at the same ISO the noise on the A7sII is noticeably...

Okay, so it turned up this morning. I've had some time with it but juggling other things too. First impressions. It feels a bit more solid than the first. The LCD on the back is a bit bigger and has less border and the EVF image is bigger too. The dials have changed and generally it seems good...

I'm testing a number of A7s related things at the moment and decided to write them up a bit more than usual, so i've prepared a blog post which looks into the encoding of the A7s at a detailed level, bit by bit...

Oops, this is a non thread. found the problem (slaps forehead...) Can we delete threads?

So there's a new A7r Mk2 which does 4K video internally. This looks super promising but most places are just regurgitating a press release, so it's a bit early to understand what it actually means. 4K @ 100mbit in Slog2 sounds good. Presume it is still 8 bit though (no mention of that). However...

Throwing this out here in case Mitch catches it or someone else can chime in. I'm considering trying to run the O7Q+ off a letus juice box on the Helix Jr. This battery is a 2600mAh at 14.8v. How can i calculate the power draw of the O7Q recording UHD ProRes from the A7s over HDMI in order to...