Ishak Sahertian reacted to Sage in Pocket 4K to Alexa Conversion
"Pocket 4K footage is precisely transformed to match the color science of the Arri Alexa, without compromise. This is achieved without artifacts, while introducing a smooth, organic rolloff."
For the better part of the last year, I've been working to map the color of P4K BMDFilm to match my Alexa's LogC, as measured under sunlight and halogen. To do this, I wrote an interpolation program in C++ that can accept an enormous amount of data (~40k samples per camera), and interpolate smooth internal contours, or 'waves' between them. Exposure compensation conversions were made with the same interpolation engine (transforms replicating sensor color response with variant exposure).
Another significant element of the project was to recreate Arri's Rec709 to maintain the entirety of recorded LogC gamut, in a film-derived envelope (for the display variations). This was particularly difficult, as the correct RGB primary behavior needed to be exactly replicated within contiguous 709, but smoothly diverge to HDR-like handling of far gamut (where Arri's Rec709 ends). This new envelope (EC Gen.4) is particularly impressive, and I may release it for the Arri, as it is significantly preferable to normal Arri Rec709.
Ishak Sahertian reacted to Sebastien Farges in AIVASCOPE 1.5x anamorphic on Helios on Lumix S1H
AIVASCOPE 1.5x on Helios 44-m 58mm f2 @ full aperture on Lumix S1H
I had a two hours time having in my hands the Lumix S1H in a workshop organized by Panajou Photograph shop in Bordeaux.
This was shot in full frame 4k 24p 8bits then 10 bits 150 mpbs (after the desolve @3'48'') -my sd card didn't want the 400mbps-
Unfortunately my old Premiere didn't liked the 10bits, I had to transcode it.
Panasonic Lumix S1H
L mount to M42 adapter
Helios 44-m 58mm f2 @ full aperture f2
Aivascope anamorphic lens
variable ND filter
+3 macro filter
full frame 4k 24p
Few CC Lumetri Cinespace 25
Thanks to Aivascope
Thanks to Panajou Photograph shop
Thanks to Bernard Bertrand for his precious help
L'impératrice "Le départ"
Gyoergy Ligeti "Musica Ricercata N°7"
Ishak Sahertian reacted to Oliver Daniel in “The Middle Path”: A Lumix GH5s Short
The forehead is most in focus, which means, erm.....
....the tonal shifts seem deeper and smoother than regular GH5, but who knows, that could just be better grading.
Dual ISO seems the most likely, with RAW a big stretch but fun to consider!
I do think it’s a new camera AND a firmware upgrade, with the “new” camera probably receiving something a little extra, like the GH4R did.
Ishak Sahertian reacted to wildrym in Lumix GH5 Downloadable Footage
Yes I get it, but what I mean is that instead of using almost 1024 values, it is limited to only 600ish. In 10 bit files, it is ok i guess (even though non optimal), but in 8 bit files it becomes only 160ish values. So using Vlog in 4k 60p may lead to severe banding.
In comparison here are two waveforms from a7s 4k slog2 footage. The second is the same as the first one with superwhite pulled down. Third is GH5.
As you can see, sony files use roughly IRE from 10 to 109, so approximately 230ish values in 8 bit. It 10 bit it would be 950ish values which would give better tonality than GH5 Vlog files.
That is why I find it quite disapointing (tell me if I'm wrong with my reasoning!)
Ishak Sahertian reacted to The Chris in What would you like to see Nikon, Olympus, Fuji do to improve video?
The Nikon 1 series has some pretty amazing PADF capabilities, and had it before Canon or Sony, they can do mirrorless AF.
They're in a tough spot to do large sensor mirrorless because of their commitment to the F-mount, Sony isn't exactly lighting the world on fire with the kludgy LAEA adapters that mate A-mount glass to E-mount bodies, reception to and adapter will probably be equally cold.
Ishak Sahertian got a reaction from varjohukka in Rectimascop 48 2x focusing problems / adjusting?
On my Rectimascop it's the backglass you can rotate, for me it took a nudge. You don't have to unscrew the backlens, just loosen the screws and give the backlens a nudge clockwise or counterclockwise. And fasten the screws when you get a sharp image via Vladimir's method