Image of the day

At those powers you need perfect seeing and a highly corrected mirror. Are you sure you have a parabola on that mirror, and not just an approximation of one? Do the stars shimmer, dance and bloat inside and outside of focus, or do they sit still, presenting a concentric Fresnel pattern on either side of focus? With perfect stable seeing and a really good paraboloid, you can reach 800x with a 10" Newt and have a sharp view.

Rolando

July 14, 2012 04:17 PM Forum: CCD Imaging and Processing/Deep Sky

NGC 6888 - Color from Ha & OIII

Posted By Roland Christen

On the plus side, nice large field with that combination of scope and camera.

On the minus side, you missed recording the Soap Bubble just below the bottom of the field.

Also, the focus looks a tad off.

Rolando

July 14, 2012 10:16 PM Forum: CCD Imaging and Processing/Deep Sky

M8 Hourglass Nebula in Narrowband

Posted By Roland Christen

The Hourglass was imaged by Hubble. Here is my humble image in comparison.

Rolando

Image of the day

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Posts Made By: Roland Christen

First Venus transit image processed

(yawn)

No more Car Talk

NGC 5371 Galaxy Field

Sunspots & Granulation

M8M20Color

M9-NGC6333 and NGC 6342 area with dark nebula

Zhummell 3mm EP

NGC 6888 - Color from Ha & OIII

M8 Hourglass Nebula in Narrowband

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