Q: How can I change the reddish astro images taken by my modified camera to the natural colored astro images?

A:  The camera modification for astro photography aims to  maximum H-alpha (Hα)  656nm recording. Camera modification for astro photography make the regular camera to High Ha sensing camera, it’s about 3 times more compared to unmodified digital cameras.

But the color of background will become so reddish, because the increased red light amount.

There are many ways of image processing to correct the reddish colors to natural colors.

Here are 2 simple ways.

A. Take the shots using Custom White Balance

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Monochrome Camera

WHAT IS A ‘DEBAYERED CAMERA’ ?

To convert the color image sensor of a generic digital camera to a monochrome sensor, we must remove the bayer filter layer(= Color Filter Array=CFA) on the image sensor. This is called “Debayering”.

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Astro A7s System Chart

1. Active Cooling with EXcooler
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Astro 6D System Chart

1. Active cooling with EXcooler
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Astro A7s (Cooling modified SONY A7s)


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).

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Test shots of Monochrome eos 60D

Below is the first test shot image when we tried ti remove the Micro Lens and CFA using optical polishing powder. The brightness of the micro lens removed area is quite a lot dimmer than the area with the micro lens and CFA still intact.

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B/W DSLR modification study

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

CDS-5D (Cooled 5D mark III) Dark Frame Compared

We compared the dark frame shots of unmodified eos 5D MarkIII and Cooled 5D mark III.The images were taken at indoor dark room and the exposure time was 450sec ( 7.5 minutes) and ISO setting was 1600. We croped 650×325 pixels in center area of original images and not resized.

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