Hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  Chort (θLeo)  ·  M 65  ·  M 66  ·  NGC 3593  ·  NGC 3623  ·  NGC 3627  ·  NGC 3628  ·  The star 73Leo  ·  The star Chertan  ·  The star ιLeo
Looking into Leo, 



    
        

            Richard
Looking into Leo
Powered byPixInsight

Looking into Leo

Looking into Leo, 



    
        

            Richard
Looking into Leo
Powered byPixInsight

Looking into Leo

Technical card

Imaging telescopes or lenses: Canon EF 200 f/2.8 L USM II

Imaging cameras: Canon EOS 5D Mark III

Mounts: iOptron Skyguider

Guiding cameras: QHYCCD PoleMaster

Software: APT AstroPhotograhy Tool  ·  PixInsight 1.8  ·  Adobe Lighroom CC Classic

Accessory: Feisol PB-70  ·  Andoer 70mm Quick Release Plate Clamp


Dates:April 24, 2020

Frames: 57x30" (28' 30")

Integration: 28' 30"

Avg. Moon age: 1.26 days

Avg. Moon phase: 1.79%


Basic astrometry details

Astrometry.net job: 3507127

RA center: 11h 19' 28"

DEC center: +12° 58' 44"

Pixel scale: 6.594 arcsec/pixel

Orientation: 268.337 degrees

Field radius: 3.303 degrees


Resolution: 3000x2002

Data source: Backyard

Description

Back to the 200mm lens and more acquisition time! This widefield shot of the Leo Triplet is still quite significantly cropped because of some difficult gradients on the edges. I captured more time on this target than any previous efforts and spent more time processing. I've lost some galaxy detail but am happy with my star shapes and mostly gradient-free background.

Capture details:
iOptron SkyGuider mount on standard 1.5" tripod (at lowest height), PoleMaster polar-aligned. Canon EOS 5D III DSLR and Canon EF200mm f2.8L II lens attached to mount via lens tripod foot, Arca-Swiss plate, an Arca Swiss clamp and a Feisol panning base.
57 light frames / 30s / f4 / ISO 400
16x dark frames
41x flat frames
~50x bias frames

Initial processing done in PixInsight (Calibration, Debayering, Star Alignment, Integration) followed by: SCNR, dynamic crop, ABE, Wavelets-MultiscaleLinearTransform, AdaptiveStretch, Curves and PhotometricColorCalibration.
Final editing done in Lightroom Classic 9.2 (cold pixel removal + brush stroke adjustments on galaxy for colour, noise reduction and sharpness).

Comments

Sky plot

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Histogram

Looking into Leo, 



    
        

            Richard

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