Mehmet Ergün

Photographer: Mehmet Ergün
Title: M31 Andromeda Galaxy

Image Data:

Equipment:
Nikon D850 (CentralDS)
ASA Astrograph 12″
Hutech IDAS D1
Baader 7NM H-Alpha
ALT 7 Mount

EXIF:
20 x 3min RGB
6 x 5min H-Alpha

Software:
PI, PS, LR

Alessandro Cipolat Bares

Photographer: Alessandro Cipolat Bares
Title: M31 Andromeda Galaxy

Image Data:

Camera : CentralDS Astro 60D Cooled.
Telescope: FSQ85
Site: Aosta Valley, Italy

Enrico Enzmann

Monochrome A7s CMOS Sensitivity Test

Debayered 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

 

 

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

 

 

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

Photographer: Vincent Cheng
Title: NGC7822

Image Data:
Date 31,OCT,2016
Place Cingjing, Taiwan
Camera : CentralDS Astro A7s (cooled at -1C)
Telescope/Lens : f/4 @ Canon 300mm f/4L non-IS
Filter : Optolong 2″new 7nm NEW Ha, SII, OIII
ISO : 3200
Tracking Mount : Kenko Skymemo S
Autoguide : none
Total Exposure Time : Ha:3mins X 23frames, SII:3mins X 22frames, OIII:3mins X 32frmaes
w Dark Frames, Bias Frames
process w PI, PS CC

RAW File Loading in Photo shop ( using Camera Raw )

File > 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.

Read more

Image Processing for Nebula Object

There are so many ways to make astro images from Raw File .

Here is one way using RawDigger + Photoshop. Read more

Enrico Enzmann