A7S Observations and Tests
- Thread starter nyvz
- Start date
philiplipetz
Veteran
Yyeah but it charges through usb. May not need for it
The USB will charge the battery pack only when the camera is turned off. From the user guide:
1. Turn the power OFF.
2. Connect the camera with the battery pack inserted to the AC Adaptor (supplied) using the micro USB cable (supplied), and connect the AC Adaptor to the wall outlet (wall socket).
and
Charging by connecting to a computer
The battery pack can be charged by connecting the camera to a computer using a micro USB cable.
1. Turn off the product, and connect to the USB terminal of the computer.
photochris
Well-known member
The A7s goes into usb mode when the cord is plugged into the camera, even when it's connected to the crappy USB wall adapter that came with the A7. I cycled through all the USB settings and none of them would allow me to shoot while charging. Though you can use the A7 camera remote desktop program to control the camera - it doesn't charge while connected. I think the AC adapter may be the only way to shoot and draw power.
But batteries are cheap. I bought a 2 wasabi batteries + a wall charger for $24 on amazon. Buy 4 of those sets, pop the chargers on a strip outlet and you'll have tons of power for $100.
But batteries are cheap. I bought a 2 wasabi batteries + a wall charger for $24 on amazon. Buy 4 of those sets, pop the chargers on a strip outlet and you'll have tons of power for $100.
philiplipetz
Veteran
Samuel H measures it as 30.5ms, which is almost as bad as the Nikon D90 at 33ms, and worse than the infamous 5Dii
RESULTS:
GH4 1080p: 13.7 ms (13.7-13.5-13.1-14.0-13.9-13.5-13.5-13.9)
RX10: 14.8 ms (14.5-14.8-15.0)
GH3: 15.5 ms (15.4-15.7-15.4)
BMPCC: 17.8 ms (17.7-17.7-20.0-20.0)
5D3: 20.5 ms (20.7-20.5-20.4)
D5200: 22.4 ms (22.5-22.1-22.6)
GH4 4K/UHD: 22.5 ms (23.2-22.3-22.7-22.7-22.4-21.8-22.4-22.8-22.6)
BMC: 25.0 ms (26.7-24.8-23.5)
5D2: 25.9 ms (25.5-26.4-25.8)
NEX-5N: 29.4 ms (28.8-29.6-28.9-29.8-29.8-29.1-29.7)
a7s FF 1080p: 30.5 ms (30.1-32.0-30.5-30.3-29.2-30.9)
OTHER NUMBERS, MOST OF THEM FOUND BY SQUIG SOMEWHERE ON THE WEB:
Film 5ms? (here)
Scarlet 14ms
F65 14ms
FS100 15ms
AF100 14.85ms
C300 16ms
Red One MX 16.6ms
7D 21ms
5D MKII 25ms
GH1 25ms
D90 33ms
dfreerider
Well-known member
Yes, it does.
Hi Noah informative thread, am about to order the Commlite EF to NEX adapter - any reason i should save up and get the metabones instead?
I'm not expecting fast AF with any of these adapters but would love to use my Canon 70-200 2.8 ii for photographs too, is the AF in stills mode a waste of time or useable
I'm not expecting fast AF with any of these adapters but would love to use my Canon 70-200 2.8 ii for photographs too, is the AF in stills mode a waste of time or useable
Last edited:
paulcurtis
Veteran
Some additional observations.
The Black level adjustment doesn't appear to affect Slog gamma, you can set it to what you want but it doesn't change the blacks in the output file at all. Slog2 has raised blacks, (about 20 to 30 in 8 bit 255 - which is a huge chunk of storage wasted)
The Black gamma will affect the image, it won't change the black level but it will crush or raise blacks but it doesn't change the range at all just mangles the bottom end. Very limited use.
What is concerning is the amount and nature of shadow noise:
Big purple blobs, the top is the green channel which should be the 4 (full luminance) colour sampling.
This is the XAVC direct into After Effects, i don't know if there are decoding issues as i've never messed with it before. When i get an HDMI cable i'll see what the signal is like bypassing the XAVC in case that's the problem.
It's odd, i know it's shadows and they'll be crushed but squeezing 12+ stops into 220 code values is pretty tough going all over, more so than the 700.
Has anyone else seen this?
cheers
Paul
The Black level adjustment doesn't appear to affect Slog gamma, you can set it to what you want but it doesn't change the blacks in the output file at all. Slog2 has raised blacks, (about 20 to 30 in 8 bit 255 - which is a huge chunk of storage wasted)
The Black gamma will affect the image, it won't change the black level but it will crush or raise blacks but it doesn't change the range at all just mangles the bottom end. Very limited use.
What is concerning is the amount and nature of shadow noise:
Big purple blobs, the top is the green channel which should be the 4 (full luminance) colour sampling.
This is the XAVC direct into After Effects, i don't know if there are decoding issues as i've never messed with it before. When i get an HDMI cable i'll see what the signal is like bypassing the XAVC in case that's the problem.
It's odd, i know it's shadows and they'll be crushed but squeezing 12+ stops into 220 code values is pretty tough going all over, more so than the 700.
Has anyone else seen this?
cheers
Paul
Birkkromann
Member
First a disclaimer: I don't yet have an A7s, so all my observations are from grading other people's footage (mainly Roman's stuff)
Quite impressed with the camera so far! When grading 8bit S-Log2 it is VERY evident that the codec is not sufficient enough (mainly talking with Roman's footage in mind)
Everything is more or less acceptable until you start touching anything closely related to saturation. As I don't have my camera yet I can't test if adding some saturation to the output (not sure of a better way to explain it) will solve a lot of the noise issues I've come across. Might be something for you guys to test out.
Also, adding a -15 overall hue does wonders to the colours. I was very surprised to see what it did to the footage. This could possible be done in-camera with WB and tint, but on all Roman's clips it works wonders!
Just my 2%
Quite impressed with the camera so far! When grading 8bit S-Log2 it is VERY evident that the codec is not sufficient enough (mainly talking with Roman's footage in mind)
Everything is more or less acceptable until you start touching anything closely related to saturation. As I don't have my camera yet I can't test if adding some saturation to the output (not sure of a better way to explain it) will solve a lot of the noise issues I've come across. Might be something for you guys to test out.
Also, adding a -15 overall hue does wonders to the colours. I was very surprised to see what it did to the footage. This could possible be done in-camera with WB and tint, but on all Roman's clips it works wonders!
Just my 2%