Hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  M 65  ·  M 66  ·  NGC 3593  ·  NGC 3596  ·  NGC 3623  ·  NGC 3627  ·  NGC 3628  ·  NGC 3666  ·  The star 73Leo
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Leo Triplet area (wider view), 


Leo Triplet area (wider view)
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Leo Triplet area (wider view)

Technical card

Imaging telescopes or lenses: Samyang 135 ED UMC F2

Imaging cameras: ZWO ASI533MC Pro

Mounts: Sky-Watcher AZ EQ6 GT Pro

Software: IDEIKI AstroPhotography Tool (APT)  ·  PixInsight  ·  Aries Productions Astro Pixel Precessor  ·  PHD2

Dates:Jan. 19, 2021

Frames: 240x30"

Integration: 2.0 hours

Avg. Moon age: 6.15 days

Avg. Moon phase: 36.99%

Basic astrometry details

Astrometry.net job: 4182011

RA center: 11h 19' 14"

DEC center: +13° 2' 16"

Pixel scale: 5.965 arcsec/pixel

Orientation: 129.517 degrees

Field radius: 2.514 degrees

Resolution: 2700x1385

Data source: Backyard


These objects are probably not suited to the wide field view of a Samyang 135mm. Saying that, there's still some interesting extra galaxies (e.g. NGC 3596 on the far left) in the field and while the Leo Triplet are still very small, there is a little pleasant detail and colour showing.

This was 240 x 30s with the Samyang 135 @ F2. I'm still finding F2 challenging with exposure duration, star sizes (huge) and shapes.

Between a terrible decision on framing and some bad gradients captured, it's cropped to this view, but I think it works.

Captured with Apt, calibrated in APP and processed in PixInsight.


Sky plot

Sky plot


Leo Triplet area (wider view), 



In these public groups

Samyang 135 f/2