M 8 The Lagoon Nebula, M 20 The Trifid Nebula, Sag.

M 8 The Lagoon Nebula, M 20 The Trifid Nebula, Sag.

DESCRIPTION: Very nice target for smaller telescopes and camera lenses. I am surprised of data quality because I was shooting during astronomical twilight and nebulae were only approx 15° above south light polluted horizon… All comments are welcome, you can be critique and please constructive.

OBJECT: M 8 The Lagoon Nebula, M 20 The Trifid Nebula, Constelation Sagittarius, M8 apparent magnitude 6, apparent dimension 90’ x 40’, M20 apparent magnitude 6,3, apparent dimension 28’ x 28’, FOV 2,7° x 1,8°.

GEAR: Nikon Z7 Kolari Full Spectrum + Nikkor 500/5,6 PF, Astronomic UV/IR/L2 Clip in filter, Rollei Astroklar light pollution filter, Dew heater strip, sensor pixel scale 1,79 arcsec/px, tracking mount iOptron CEM60EC – 3 star alignment, no auto guiding.

ACQUISITION: July 3-4, 2021, Struz, CZ, Subexposure 180s, f 5,6, ISO 640, Interval 15 s, RAW-M, Light 19x, Dark 20x, Bias 20x, Flat 20x, DarkFlats 10x. Total exposure time 57 min. Astronomical twilight, no wind, 9°C, No Moon, Light polluted backyard – Bortle 5.

STACKING AND POST PROCESSING: AstroPixelProcessor (stacking, background neutralization, light pollution removal, calibrate background) , Adobe Photoshop CC 2020 ( black and white point settings, stretching, dim stars, enhance DSO, contrast setting, no noise reduction). Cropped 2,3x x, image size 3840 x 2560 px.

Posted by Vladimir Machek on 2021-09-21 14:59:15

Tagged: , M20 , Trifid_nebula , M8 , Lagoon_nebula , Messier_8 , Messier_20 , astrophotography , astrophoto , night , nightsky , starrysky , nikonz7 , Nikkor500 , ioptron , CEM60EC , space , deepspace , universe , Sagittarius

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