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Nikon D800 50 mm Lens (Sensor Artifact) in M94 Area Star Field, Jerry Yesavage
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Nikon D800 50 mm Lens (Sensor Artifact) in M94 Area Star Field

Nikon D800 50 mm Lens (Sensor Artifact) in M94 Area Star Field, Jerry Yesavage
Powered byPixInsight

Nikon D800 50 mm Lens (Sensor Artifact) in M94 Area Star Field

Equipment

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Acquisition details

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Description

Nikon hacker firmware used to get true levels from the sensor, which seems to have a small defect in the chip field that internal processing masked... this is seen in the last revision, which I just put up with the red arrows. If you do not get linear levels, you cannot get a good flat field.

The original image, which is better than my previous ones with the Nikon, has stopped down the 50mm F 1.4 to F 2.8 to reduce vignetting and star distortions.

Both were improved and flat field corrected... flats are not yet perfect either There are still stars distortions, but probably will be good for H-alpha when I get the filter. I have the Astronomiks 12nm ordered to do Sharpless2 wide fields.

Processing:

Stacked in PI with default settings.

Photometrically color corrected.

DBE applied to get rid of gradients but no new STF used.

Converted to non-linear and denoised in Photoshop with Topaz Denoised.

Background clipped.

Result about 18000 stars. Original before denoising had 19000. Cliped 1000 stars to deal with the chip defect.

Comments

Revisions

  • Nikon D800 50 mm Lens (Sensor Artifact) in M94 Area Star Field, Jerry Yesavage
    Original
  • Final
    Nikon D800 50 mm Lens (Sensor Artifact) in M94 Area Star Field, Jerry Yesavage
    B

B

Description: Sensor defect... left and right halves of the sensor are different... line down the middle with the red arrows.

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Sky plot

Sky plot

Histogram

Nikon D800 50 mm Lens (Sensor Artifact) in M94 Area Star Field, Jerry Yesavage

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