Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Lagoon Nebula  ·  M 8  ·  NGC 6523  ·  NGC 6526  ·  NGC 6530  ·  The star 7Sgr  ·  The star 9Sgr
Getting plate-solving status, please wait...
M8 Lagoon Nebula, 



    
        

            Greg Bock
M8 Lagoon Nebula
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M8 Lagoon Nebula

Getting plate-solving status, please wait...
M8 Lagoon Nebula, 



    
        

            Greg Bock
M8 Lagoon Nebula
Powered byPixInsight

M8 Lagoon Nebula

Technical card

Imaging telescopes or lenses: Orion Optics UK 150F4 Ultrascope

Imaging cameras: ZWO ASI071 MC Pro

Mounts: Skywatcher HEQ5 Pro GoTo + Rowan belt mod

Guiding telescopes or lenses: Orion Optics UK 150F4 Ultrascope

Guiding cameras: ZWO ASI120mm Mini

Focal reducers: Skywatcher F4 Aplanatic Coma Corrector

Software: Aries Productions Astropixel Processor  ·  Adobe Photoshop CC 2019

Accessory: ZWO OAG M48


Dates:July 11, 2021

Frames: 39x300" (3h 15')

Integration: 3h 15'

Avg. Moon age: 1.38 days

Avg. Moon phase: 2.15%


Basic astrometry details

Astrometry.net job: 4758870

RA center: 18h03m43s.2

DEC center: -24°2157

Pixel scale: 1.642 arcsec/pixel

Orientation: 18.507 degrees

Field radius: 1.352 degrees


Resolution: 4940x3278

Locations: Leyburn Observatory - Dark Sky, Leyburn, Queensland, Australia

Data source: Backyard

Description

Six months of experimental work with 3 different coma correctors has now completed with this image of M8 which is being used as a kind of 'standard candle' for judging field flatness...this was taken with a 150mm diameter mirror Newtonian at F4, with a Skywatcher F4 Apanatic CC. 
it's not as flat in the corners as I would like, but its the best i can do without messing around more.
Originally tried a Baader Coma Corrector MPCC Mk III, but at F4, the stars would not focus properly, always seemed soft and corners were not corrected to rounds stars..
Second attempt - Baader RCC corrector, but although it was an improvement over the MPCC, it did not correct as well as the Skywatcher F4 Aplanatic CC.

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Histogram

M8 Lagoon Nebula, 



    
        

            Greg Bock