Look at the stars

For starry sky live broadcasters

[Α 7 SⅢ + SIGMA Art 14 mm f1. 8] and [α 7 S (first generation) + Nikkor 14-24 mm f2. 8 G] * Short review of starry sky live video *

2021 February 6 day

97062 BA3-D23D- 4 DC7-B3CD- 4847 FE5CC733_1_105_c
[Α 7 SⅢ + SIGMA Art 14 mm f1. 8] and [α 7 S (first generation) + Nikkor 14-24 mm f2. 8 G] * Short review of starry sky live video *
I'm TA, the director of the virtual astronomical department. Since there was a request, I will briefly summarize the impression that both devices were actually used for live distribution.
(It's a little maniac content, I will write it for those who perform live starry sky distribution)
(I have never operated α 7 SII (2nd generation aircraft), but I will describe it from my experience dealing with data)
[Comparison conditions]
HDMI 1080 p output from camera → 1080 p livestreamed video comparison on BMD ATEM Mini Pro
The difference in the camera body is much larger than the difference in the lens. In the starry sky distribution, the α 7 S series has a wall that the 1st 3 generation aircraft and the 1st 1,2 generation aircraft are different and cannot be overcome.
With the combination of "α 7 SⅢ + SIGMA Art 14 mm f1. 8", it is possible to live stream the starry sky in an atmosphere closer to the human view, and depending on the setting, it can be delivered up to about 5 grades on the smartphone screen. Live distribution that can be visually recognized is possible.
[About the lens]
In the case of photographs, SIGMA Art 14 mm f1. Compared to Nikkor 14-24 f2. 8 G, the advantage of 1+1 / 3 steps is large, and it is highly recommended for live starry sky distribution.
[About the camera]
In the catalog specifications, there is no big difference between α 7 SⅢ and α 7 SⅡ & the first generation, but α 7 SⅢ is superior in all aspects.
Of particular note is the presence or absence of color reproduction and amplifier noise (purple noise that appears in the corners of the screen at high sensitivity), and images with ISO 50000 or higher are in a different dimension. There is a fundamental difference that cannot be expressed by the expression "difference by ○ steps".
The dynamic range has also improved by about one step, and there is more room than the specifications for starry sky distribution.
[Settings at the time of actual delivery]
For live streaming of meteor showers ...
☆ α 7 S (first generation) + Nikkor 14-24 f2. 8
Aperture open (f2. 8), SS 1 / 4 sec, ISO204, 800
↑ Actually, I want to make it a little more irritating, but the setting is that anything more difficult
☆ α 7 SⅢ + SIGMA Art 14 mm f1. 8
Aperture open (f1. 8), SS 1 / 10 sec, ISO102, 400
↑ Settings that still have spare capacity and can be driven further if necessary
You know Tenriff's review video
Comparison video of kita photo who writes a review article in the month issue of Hoshi Navi 2021