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Contains:  IC 2391, M 48, NGC 2548, IC 2177, The star κVel, The star Aludra (ηCMa), The star Suhail (λVel), The star Naos (ζPup), The star δVel, The star Mirzam (βCMa), The star Wezen (δCMa), The star γ2Vel, Adara (εCMa), The star Adhara, The star Sirius (αCMa), Part of the constellation Vela (Vel), Part of the constellation Puppis (Pup), Part of the constellation Canis Major (CMa), The constellation Pyxis (Pyx)
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Wide field Gum Nebula in Ha with Sigma 15mm f/2.8 and Canon EF focus controller, 





    
        

            Freestar8n
Wide field Gum Nebula in Ha with Sigma 15mm f/2.8 and Canon EF focus controller

Wide field Gum Nebula in Ha with Sigma 15mm f/2.8 and Canon EF focus controller

Technical card

Resolution: 3970x2914

Dates:April 6, 2019

Frames: 40x60"

Integration: 0.7 hours

Avg. Moon age: 1.06 days

Avg. Moon phase: 1.28%

Astrometry.net job: 2629288

RA center: 121.568 degrees

DEC center: -33.163 degrees

Pixel scale: 51.318 arcsec/pixel

Orientation: 292.170 degrees

Field radius: 35.102 degrees

Locations: Patio, Melbourne, Victoria, Australia

Data source: Backyard

Description

This is my third test of a new Canon EF focus controller - this time with a wide angle Sigma 15mm f/2.8. The resulting field is about 50 degrees wide - and big enough to capture the Gum Nebula in a single frame.

This is with a Custom scientific 10nm filter - which appears to work ok despite the lens being wide field and wide open.

The lens was attached via the focus controller and ZWO mini filter wheel - and manually focused remotely via USB. The field is somewhat uneven at the edges and I expect it to improve with automatic focusing.

The image has been cropped and some gradient removal. Other than that just levels applied and no other processing.

40x1m exposures, unguided.

Comments

Author

Freestar8n
Freestar8n
License: None (All rights reserved)
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Wide field Gum Nebula in Ha with Sigma 15mm f/2.8 and Canon EF focus controller, 





    
        

            Freestar8n