Monthly Archives September 2013

The Pillars of Creation

m16pr2_rs


Subject: M16 - Eagle Nebula
Telescope: Celestron CPC 800 with f/6.3 reducer
Camera: Canon Rebel T1i
Technique: 46 lights between 1600 and 6400 ISO with exposures varying from 15 to 30 seconds. Total exposure time of 22 minutes 36 seconds. 16 darks. 50 biases.
Prime focus. Stacked with Deep Sky Stacker. Post-processing in Photoshop.

The Pillars of Creation have long been one of my favorite deep sky objects. After my recent success with the Dumbbell Nebula I set a goal of capturing the pillars in a similarly successful shot. Tonight was the clear and still night I needed to meet that goal.

The Pillars of Creation are actually a formation within the Eagle Nebula, an object located in the brightest portion of our galactic center...

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M57 – Ring Nebula

m57


Subject: M57 - Ring Nebula
Telescope: Celestron CPC 800 with f/6.3 reducer
Camera: Canon Rebel T1i
Technique: 9 lights between 1600 and 6400 ISO with varying exposures. Total exposure time of 5 minutes. 5 darks. 52 biases.
Prime focus. Stacked with Deep Sky Stacker. Post-processing in photoshop.

Tonight’s bright waxing gibbous moon gave me some difficulties and I was only able to salvage 9 exposures of the ring nebula. The nebula itself is only about 1.3 arcminutes in diameter making it difficult to see with smaller telescopes and binoculars. Fortunately, it’s blue color from oxygen emission lines are easy to pick up by an unmodified camera. The outer red hydrogen emissions tend do take longer exposure times to render.

Please feel free to post comments, questions, or even requests! I’...

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M27 – Dumbbell Nebula

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Subject: M27 - Dumbbell Nebula
Telescope: Celestron CPC 800 with f/6.3 reducer
Camera: Canon Rebel T1i
Technique: 20 lights between 1600 and 6400 ISO with varying exposures. Total exposure time of 10 minutes 18 seconds. 5 darks. 52 biases.
Prime focus. Stacked with Deep Sky Stacker. Post-processing in photoshop.

I had a small window tonight between when the sun set and the clouds rolled in where there was a clear sky. This gave me the chance I had been waiting for to use my new 2″ visual back which almost completely removed the vignetting seen in my most recent photographs.

I am very happy with the result. Thanks to some adjustments to my camera, the new visual back, and especially the f/6.3 reducer, I was able to successfully stack 20 frames...

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