Mehmet Ergün
/in Gallery /by liyunAlessandro Cipolat Bares
/in Gallery /by liyunEnrico Enzmann
/in User Gallery /by liyunMonochrome A7s CMOS Sensitivity Test
/in Miscellaneous /by liyunDebayered A7s CMOS
Gold wirings on 4 sides of sensor ares was covered by epoxy to protect from chemical solution. CMOS sensor is having several defected points in debayering process. And these made Horizontal rows and vertical columns in image.
Test condition:
Astro A7s camera 1 set.
Low pass filter was removed, Hoya clear filter window on airtight chamber + Hoya UV IR cut filter in Drop-In filter holder.
Indoor table , 50mm F1.4 lens +white cover plate.
ISO100, 1/20sec electric shutter (Silent mode) exposure. sony RAW image format(ARW) was taken.
Original JPG images
1.Taken from color CMOS
2.Taken from mono CMOS
ARW file was processed to 16bit B/W image in RawDigger.
1. Image from Original Color CMOS
2.Image from Debayered A7s CMOS sensor( This sensor is the one extracted from another A7s camera and debayered by chemical solution.)
Level stretched image comparison.(255 ->30)
Center Area cropped, 16pixels x 15pixels area
Luminance Level Comparison (Black=0, White=100)
We can see the difference of pixel brightness in Color CMOS :G1,G2 is more bright than Blue or Red pixels. It caused by the color filter character. In mono CMOS the bright level of pixels are very stable. I expected to see the level of mono CMOS pixels exceed to green pixels’s luminance value, but it’s 20% lower . it’s most equal to Red value and 25% over level of Blue pixels.
Average Luminance Level is Color CMOS =41, Mono Debayered CMOS= 39, Monochrome sensor is slightly lower. But in resolution aspect, Monochrome sensor is 2 times higher compared to Color sensor.
Vincent Cheng
/in User Gallery /by liyun
Photographer: Vincent Cheng
Title: Comet 46P/Wirtanen, M35 & ic433
Image Data:
Camera : CentralDS Astro A7s (cooled at-3C)
Telescope/Lens : SIGHTRON D=70mm f/5 Lanthan Apochromat Flat Field Astrograph (350mm f/5)
Filter : Color:none, Ha:Optolong 7nm Ha 2″
ISO : Color:3200, Ha:6400
Tracking Mount : Takahashi EM-10
Autoguide : none
Total Exposure Time : Color:1min X 47frames, Ha 2min X 23frames
w Dark Frames, Bias Frames
process w PI, PS CC
Vincent Cheng
/in User Gallery /by liyun
Photographer: Vincent Cheng
Title: Antares and Rho Ophiuchus Region
Image Data:
Camera : CentralDS Astro60D (cooled at-4.5C)
Telescope/Lens : f/2 @ Sigma Art 105mm f/1.4
Filter : Optolong L-pro EOS-C clip-on
ISO : 1600
Tracking Mount : Kenko Skymemo S
Autoguide : none
Total Exposure Time : 30s X 139 frames
w Dark Frames, Bias Frames
process w PI, PS CC
Vincent Cheng
/in User Gallery /by liyunRAW File Loading in Photo shop ( using Camera Raw )
/in Miscellaneous /by liyunFile > Open.. > Choose your CR2 file.
Check factors in [Basic] and set the values as below.
Check factors in [Detail] and set the values as below and press [Open Image] Button.
Image Processing for Nebula Object
/in Miscellaneous /by liyunThere are so many ways to make astro images from Raw File .
Here is one way using RawDigger + Photoshop. Read more