Astromart

July 22, 2009 02:37 PM Forum: CCD Imaging and Processing/Deep Sky

Network and Cirrus Nebula

Great job. You certainly know how to get the best out of that small aperture along with your digital camera.

Have you tried shooting with an astronomical CCD camera like the ST2000?

Rolando

July 23, 2009 07:18 PM Forum: CCD Imaging and Processing/Deep Sky

First Light - FLI Microline 3200ME

Posted By Roland Christen

The full size version looks really strange. Did you use a minimize filter on it?

Rolando

July 23, 2009 10:35 PM Forum: CCD Imaging and Processing/Deep Sky

First Light - FLI Microline 3200ME

Posted By Roland Christen

Much more natural. Nice result.

Rolando

July 25, 2009 06:27 PM Forum: CCD Imaging and Processing/Deep Sky

Another image using the AT8RC, M27 RGBL

Posted By Roland Christen

Appears to be a mirror image

Rolando

July 28, 2009 04:18 PM Forum: CCD Imaging and Processing/Deep Sky

NGC7380 from France

Posted By Roland Christen

closeup crop showing fickle finger

July 30, 2009 05:34 PM Forum: CCD Imaging and Processing/Deep Sky

Tulip nebula, Sharpless 2-101

Posted By Roland Christen

here is a closeup of the Bock Globules in the lower left of the image.

Rolando

July 30, 2009 05:50 PM Forum: CCD Imaging and Processing/Deep Sky

Tulip nebula, Sharpless 2-101

Posted By Roland Christen

I processed this one a bit differently using Photoshop CS3 noise rejection. Waht do you all think, versus the first one?

July 31, 2009 07:05 PM Forum: Refractors

A classic .25 PV will get you 81% of perfection. However, it is quite possible to have .25 PV defect over just a tiny portion of the aperture, and have an optic that performs to 92% of perfection. It could also produce less than 80% if the defect is recurring, or irregular over the entire surface. Therefore, the PV measurement is sort of meaningless without other measurement details.

RMS and P-V can be used together to determine the overall correction, or the closeness to perfection of an optic (otherwise known as Strehl ratio).

Rolando

August 3, 2009 02:40 PM Forum: CCD Imaging and Processing/Deep Sky