Contains:  Solar system body or event
The Moon in Color with ASI462MC, astropical

The Moon in Color with ASI462MC

Acquisition type: Lucky imaging
The Moon in Color with ASI462MC, astropical

The Moon in Color with ASI462MC

Acquisition type: Lucky imaging

Equipment

Loading...

Acquisition details

Loading...

Description

If you are looking for a color camera (for visible light imaging) you are better advised with the good old ASI290MC or ASI385MC, as the color sensitivity of the ASI462MC is only slightly better than that of the ASI120MC-S. In other words, no tangible benefit in terms of exposure time. The ASI462MC comes with an AR window. When used without any optional filter the total sensitivity results in ultra-short exposure times, but the infrared portion of the spectrum is so dominant that colors are pale, appearing closer to grayscale than color. For color imaging a IR-cut filter is indispensible.

Near infrared (NIR) imaging is a different world. With an IR-pass filter you will be blessed with short exposure times, the shorter the filter's pass wavelength, the shorter the required exposure time. Even with a long IR-pass of 850nm the sensitivity is remarkable. All you need to do is to adjust the color balance to R=50 and B=50 (may slightly differ by filter pass wavelength, or try auto). If in doubt, you can record in 8-bit mono as infrared is basically monochrome.

With this being confirmed, the ASI462MC is an attractive alternative for lunar imagers, especially when working with slow focal ratios. Certainly, it can't match a monochrome camera, such as the ASI290MM when it comes to resolution, but the way shorter exposure times in infrared hence higher fps does have advantages when in combat with poor seeing.

Also notable, the camera's ability to cope with noise. A lunar image stack of 400 frames captured at gain 100 did not require any treatment for noise reduction in spite of a sensor temperature of nearly 40°C.

Except for light response, the ASI462MC is largely identical to the ASI290MC, but is less sensitive to visible light and significantly more sensitive to NIR. It has a slightly lower frame rate, but in turn a much improved noise performance.

The original (final) image is a stack of 200 frames at 10ms gain 100 with a Baader IR-cut filter. Jupiter (18ms, gain 150) and Saturn (41ms, gain 200) are inserted to scale. Poor transparency prohibited shorter expousre times.

Revision B:

The image sequence with 2x magnified insets is composed of equally processed 400/2000 frames in 8-bit and 1.5x drizzled.

Comments

Revisions

  • Final
    The Moon in Color with ASI462MC, astropical
    Original
  • The Moon in Color with ASI462MC, astropical
    B
  • The Moon in Color with ASI462MC, astropical
    C
  • The Moon in Color with ASI462MC, astropical
    D
  • The Moon in Color with ASI462MC, astropical
    E
  • The Moon in Color with ASI462MC, astropical
    F

B

Description: Image sequence with 2x magnified insets is composed of equally processed 400/2000 frames in 8-bit and 1.5x drizzled.

Uploaded: ...

C

Description:Famous Craters

A color image of 200 frames at 10ms, gain 100, 8-bit, 1.5x drizzled, IR-cut.

Uploaded: ...

D

Description:From Copernicus to Iridium

A color image of 200 frames at 15ms, gain 100, 8-bit, 1.5x drizzled, IR-cut.

Uploaded: ...

E

Description:Mare Frigoris

A color image of 200 frames at 10ms, gain 100, 8-bit, 1.5x drizzled, IR-cut.

Uploaded: ...

F

Description:The Moon Downunder
A color image of 200 frames at 8ms, gain 100, 8-bit, 1.5x drizzled, IR-cut.

Uploaded: ...

Histogram

The Moon in Color with ASI462MC, astropical