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MetaGuide: Helix Nebula with EdgeHD11 on CGE-Pro at f/7 and f/2 (hyperstar) with Atik 383L+ and ASI 1600-MM Cool

No processing other than levels and crop. Acquired and focused with SGP. Guided with MetaGuide or unguided.

Automatic focus by SGP at start and at approx 40 minute. Focus with Robofocus on the primary focuser.

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Helix Nebula in Ha

Imaging OpticsCelestron EdgeHD 11 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 - nothing manual
Exposure Time18x10m
Image Scale0.57" per pixel
Raw FWHMDown to 1.8" in 10m subs
Image ProcessingCalibration and stack in custom software. Levels stretch in PhotoShop. No other processing or sharpening.
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
DateOct, 2015
FilterAstrodon 3nm H-alpha

Maxim measurement fwhm in stack at 1.8"

(Click for full resolution)

Hyperstar image with ASI-1600MM Cool, unguided stack of 40x30s exposures.

1.4"/pixel with fwhm approximately 3.5"

Baader f/2 Highspeed 2" H-Alpha filter. Dithered with SGP using direct mount (unguided).

ASI settings: Gain 50, offset 20, USB Limit 40, Temp -10C, Raw16 format.