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MetaGuide: Tarantula Nebula in H-alpha/H-beta, with Atik 383L+ and EdgeHD 11 with reducer on CGE-Pro

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Tarantula Nebula bicolor from 3nm Ha and 8.5nm HB filters

Imaging OpticsCelestron EdgeHD 11 with reducer at f/7
MountCelestron CGE-Pro
Guiding SoftwareMetaGuide with dithering from SGP
Guiding ModeOff-axis guiding with Hutech OAG5
Imaging CameraAtik 383L+
Guiding CameraQHY5l-ii
FocusSGP and RoboFocus on the primary focuser - no mirror locks used
Exposure Timeapprox 2x10x5m
Image Scale0.57" per pixel
Raw FWHMDown to 1.5" in subs
Image ProcessingCalibration and stack in custom software, only levels in Photoshop CS6 - no other processing or sharpening
Image Processing - OtherChannels merged in Photoshop with Ha as red and HB as cyan (green+blue)
Image AcquisitionSGP
Other SoftwarePECTool, TheSkyX Pro for best guidestar selection with field of view indicator (FOVI)
Other HardwarePyxis OAG Rotator for best guidestar, Telegizmos 365 cover, Long usb cable to outside setup
DateDec. 29, 2015
FilterAstrodon 3nm H-alpha, Baader 8.5nm H-beta

Close up to show detail in center and color variation due to changing Ha/HB ratio

Monochrome version from Ha and HB data, slightly sharpened

Click for full size

Above slightly sharpened in photoshop

Maxim view of Ha unprocessed stack, with final fwhm around 1.5\"

FOVI used for guidestar selection with rotator. 8.9 mag star allowed strong signal with video at 10 fps using OAG and qhy5l-ii for MetaGuide