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Thursday, March 5, 2020

New photo "Deep In To Darkness"

We are soon running out of darkness up here 65 North. I had a one good night between Tuesday and Wednesday and I got five hours data collected for IC 410 and IC 405.

f2.8 300mm camera lens, Tokina AT-x, combined with a large 9 micron pixels in Apogee Alta U16 astro camera gives me spatial resolution of 6 arcseconds/pixel. It's little undersampled but works extremely well for my purposes to capture very dim nebula structures.

Deep In To Darkness, IC 405, IC 410 and companions
Click for a full resolution image, It's worth it!

Mapped colors from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.

H-alpha channel alone, labeled

A closeup

Tokina lens draws beautifully, when focused and collimated well.

Technical details

Processing workflow

Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.

Imaging optics
Tokina AT-x f2.8 camera lens

10-micron 1000

Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III

Total exposure time 
H-alpha, 9 x 1200 s, binned 1x1 = 3 h
O-III, 3 x 1200 s, binned 2x2 = 1 h
S-II, 3 x 1200 s. binned 2x2 = 1 h

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