paulraymaekers

compared to Samurai, the BMD records 1080P in different prores formats at 60 frames according to specs...

? and the blackmagic video assist?

hi, can anybody tell me if the A7S  (Mk1) can output 1080P at 50fps?  (in crop mode)

thanks

paul

can any one confirm that A7S outputs 1080P at 50 frames?  (crop mode)

and can anyone confirm that the A7S outputs 1080P 50frames/sec over the HDMI?  (in crop mode for sharpness)

so then the question comes...  how big would the benefit be to start recording externally on my A7S  (just for 1080P) ?   to go from 8 bit 420 XAVC to 8 bit 422 (proress probably)

please show the same test in colour? :-)

more than 10 bit versus 8 bit?

it matters a lot in situations where there is only one of the basic colours: for example under water, where only blue is left, (green and red gone)

you only have 8 bit blue left, and this give clear banding

10 bit is much better in this case

any idea about 8 bit or 10 bit?  420 or 422?

I don't think this is general for Samyang/rokinon: I have always had the impression that the lens outresolves the sensor on the A7S. I use an 85mm​ T1.5, and when shooting stills with it on A7S, they are sharp up to pixel level

so for HD film it just works perfect?

have been using metabones nikon to E mount on A7S, both with and without aperture control
both work good

used it in FF with sigma 12-24,  nikon 24-85 ED, sigma 50 2.8 macro, samyang 80 1.4, nikon 80-400, nikon 200 f4 micro  all fine

and in APS-C mode, with nikon 10-24 and nikon18-200  just works

​I understand, and if applicable, I use the APS-C mode, but is there a way to get the FF mode sharper in 1080p50?

hi all, sorry if this was already asked, but I cannot find it in the archives.

Full frame, at 50p, 1080, the A7S is less sharp when recording internally, compared to 25P

now if I would record 50P 1080 externally, do I get better resolution? or does it not matter?

paul

hi all,

using SLOG2 and grading, I'm having problems in getting the sky really blue, like it is in reality, and as it shows in PP0

the sky always looks 'thin' blue

anyone has the same experience? how to solve it?

paul

​so did the test again, both in PP0 (contrast -3) at 800 iso, and SLOG2 at 3200

starting 2 stops over zebra clipping down to 2 stops after pitch black

put it into resolve to see the waveform

PP0 I got like 9 1/3 stop  from 1024 down to zero noise

sLog2 got like max 11 stops from 1024 down to zero

what I notice in PP0  I go from 1024 to 512 in 3 stops   so very small  'bandwide' in the highlights

(not saying I'm not happy with my A7S, but till now I find only very small advantage between PP0 contrast -3  and Slog2: for everything where I don't need the absolute highest DR, I'm using PP0) 

(if AS7 would have possibility of contrast -6 or lower in PP0, probably there would be no reason to use SLOG2)

hello,

can someone tell me what is wrong in the next test with my A7S

I set zebra's to 100

PP0   ISO 800

I start shutter at 1/25 and aperture 2.8, I illuminate a white paper so I just get zebra's, this is my starting point

by increasing shutter and closing aperture, I click down till the white paper is pitch black so I don't see anything anymore..

from just zebra's to pitch black, I just get 8 1/3  stop  when contrast is -3    (contrast 0, I get 7 1/3 stop)

same test for Slog2, gamut, but ISO 3200

10 or 10 1/3 stops from zebra's to pitch black...

where is the test wrong?

paul

as you already have the speedbooster for nikon mount, adding the nikon 10-24 gives you really nice wide, even in 4k!

Yes, I do, the moire was subtle btw and the picture looks incredibly sharp otherwise. 

 

 

if it were only for sharpness, all we would need is the GH4 having an EXT TELE CONV of  x1.2  and internally recording 1080P

this would use the native pixels of the 3840*2160, and downscale it to FHD, like it does now on the HDMI output..

a 'reasonable' upgrade request...?

Yes it's the Ninja that converts the 4K to HD. That's what you are seeing in the Dropbox video above. This is why I can't see any benefit to buying a Shogun if you're going to be downsampling in post anyway. As I understand it, the GH4 gives full sensor readout when using 4K whatever. If this really is the case it actually makes more sense to record to 1080 prores. In which case a standard Ninja is probably better - saving yourself money, time, hassle and space on your hotshoe  ;)

ok, this even makes it nicer. I assume it's not the full sensor coming out of the HDMI, but the center 3840*2160 pixels, same as what is recorded when filming UHD. and the ninja just bins one pixel every 2 and one line every 2 lines  to convert it to HD...

so the workflow become so easy: film in UHD (ok, with the 1.2 crop from the full sensor), record 1080p 10bit 422, and you have perfect footage to work on.... 

Just to clarify what I said above, the footage was shot at 4K on the GH4 but recorded to the Ninja as 1080p. I have no idea if you will get superior results recording 10-bit/422 4K to a Shogun and then downsampling in post. I don't see why you would really.

 

and this brings us to another question again :-)  (as we seem to ask good questions :-))

the HDMI out 1080p, is it compressed in a different way from the full sensor to 1080, compared to the internally recorded 1080?

I know it is 10 bit 4.2.2, but the downsampling in the camera from full sensor to 1080 is the same algorithm for internal recording and external to HDMI, so it would have the same sharpness, and not sharper as some might hope?

OR

you write: shot at 4K but recorded to Ninja as 1080p. Does the Ninja convert the 4k HDMI signal to 1080p?

any one tested the GH4  10 bit 422 external recorded ?

anybody knows where they have it on the shelf? US or Europe?

paul

did anyone recently get a GH4 from B&H?

paul

in the movie, is the gh4 in 4K or downscaled to 1080?

when I shoot prores on the bmpcc, i can get it 'sharp sharp', I think sharper than what I see in this clip

paul