Antares/M4/Rho Oph Region, UHC-S, 30 Jul 2013 (David Dearden)

Antares/M4/Rho Oph Region, UHC-S, 30 Jul 2013

An easy find; just put Antares where you want it in the frame. I took a very long time trying to get enough back focus for this shot. I finally did it by using the 1/4 and 1/2" extenders, put the UHC-S on top of those, then the 0.5x focal reducer on top of those; I used the 1/2" T-extender and a T gender changer on the scope and still had to take the lock ring off so I could screw the lens in far enough to make focus. As a result, I used up a lot of exposure time so the image has far too little data and is quite noisy. It framed up OK though.

Date: 30 Jul 2013

Subject: Antares/M4/Rho Oph region

Scope: 9x50 Finder/Guider + Antares 0.5x Focal Reducer (at ~1”, 0.6x)

Filter: Baader Planetarium UHC-S

Mount: CG-5 (Synta motors)

Guiding: Orion ST80 + DSI Ic + PHD 1.14.2

Camera: DSI IIc (TES1-12704 chiller at 1.75 A, T = 15 °C)

Acquisition: Nebulosity 3.1.7, no dither

Exposure: 8x300 s

Stacking: Neb 3, bad pixel map, bias included, normalize first, trans+rot align, 1.5 SD stack.

Processing: StarTools 1.3 Crop; Wipe:Color & Brightness; Develop 91.13%; Contrast; HDR:Equalize; Sharpen Deconvolute: 3.3 pix; Track; Color:Bottom 2.0, Top Full, Sat 500%; Denoise (twice); Rotate 90°; Life:Heavy. CS6+Astronomy Tools Increase star color; Deep Space NR; Space NR; AstroFrame.

Final
Original
B

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