Astro A7s System Chart
1. Active Cooling with EXcooler
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1. Active Cooling with EXcooler
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1. Active cooling with EXcooler
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The launch of Sony’s A7s this year is remarkable because of it’s very good low light performance and 4K movie mode with it’s Full Frame image sensor.
The A7s 12 megapixels is small compared to other full frame digital cameras but this camera is special to amateur astronomers because of it’s ultra high iso (up to 409,600).
Generally color image sensor is arranged as the pattern of RGBG 2×2 pixels color filter array, It can make the color images through 1 shot exposure but the large amount of light were blocked by color filters on CMOS and color processing algorithm produce false colors. The optical low pass filter to prevent false color on color image sensor makes lower resolutions to output image.
In low light photography field B/W sensor with high QE and low noise is most valid device for higher resolution image. Read more
Prepare LR44 battery 2ea, Micro size hex L wrench set (1.27, 1.5, 2, 2.5mm …)
1. Unscrew four M2 screw using 1.27mm hex wrench.
2.Unscrew M3 Socket Set Screw using 1.5mm hex wrench.
3.Open the cover plate.
4.Detach the thermometer panel from body.
5.Open the battery cover.
6.Replace the battery.
7.Assemble in reverse order.