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, 


Looking into Leo
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Looking into Leo

Looking into Leo, 


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


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).


Sky plot

Sky plot


Looking into Leo, 



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Camera Lens Astrophotography