Celestial hemisphere:  Northern  ·  Constellation: Lyra (Lyr)  ·  Contains:  IC 1296  ·  M 57  ·  NGC 6720  ·  Ring Nebula
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M57, The Ring Nebula, no reducer, David Dearden
M57, The Ring Nebula, no reducer
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M57, The Ring Nebula, no reducer

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Description

Still seeing elongation in the RA direction, so I need to determine what is causing this and see if it can be fixed. I think east-loading the mount might help. To top it off, the IR cut filter on the camera fogged up just before the clouds rolled in.

Date: 6 Jul 2012

Subject: M57, Ring Nebula

Scope: AT8IN

Filter: none

Mount: CG-5 (Synta motors)

Guiding: Orion ST80 + 0.5x Antares telereducer + DSI Ic + PHD

Camera: DSI IIc

Acquisition: Nebulosity 3.0.7

Exposure: 17 x 120 s

Stacking: Neb 3, bias included, normalize first, auto quality screen, trans+rot align, 1.5 SD stack

Processing: auto color balance, levels, curves, GREYCstoration, unsharp mask, saturation boost, CS5 curves and levels, unsharp mask, Astronomy Tools color blotch, deep space, & space noise reduction, star color enhance

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M57, The Ring Nebula, no reducer, David Dearden