Posts Made By: Roland Christen

March 31, 2011 09:53 PM Forum: CCD Imaging and Processing/Deep Sky

M106 2nd attempt

Posted By Roland Christen

This is a full resoluton crop of the area just above and to the left that shows lots of little galaxies. They look like stars, but I believe they are very faint distant galaxies.

Rolando

March 31, 2011 09:59 PM Forum: Astro-Physics

M106 2nd attempt

Posted By Roland Christen

This is a full resoluton crop of the area just above and to the left that shows lots of little galaxies. They look like stars, but I believe they are very faint distant galaxies.

Rolando

April 7, 2011 12:05 AM Forum: CCD Imaging and Processing/Deep Sky

M106 2nd attempt

Posted By Roland Christen

Re-processed for more contrast and detail. Cropped to show the main galaxies.

Small Size

May 14, 2011 07:32 PM Forum: CCD Imaging and Processing/Deep Sky

An excellent image of that galaxy and all those little ones surrounding. I like the negative image also - it reminds me of the time when we used to take film images. There's something about seeing the negative come out of the developing process and spotting the image of a galaxy on that piece of film.

Rolando

May 28, 2011 04:21 PM Forum: Landscape Photography

Hawaii from a Helicopter

Posted By Roland Christen

Great shots! I've hiked part of the trail that runs along those cliffs.

Rolando

June 2, 2011 04:15 PM Forum: Bad to the Bone Autos

New Ride

Posted By Roland Christen

Nice looking car! Want to see how it does against the Rolando Mustango?

June 13, 2011 04:37 PM Forum: Refractors

Origin of astigmatism in doublet achro refractors?

Posted By Roland Christen

Astig usually is caused by non-homogeneity inside the glass. Very high homogeneity glass is required for first class objective lenses, but such glass is quite expensive.

Sometimes if both elements have some astigmatism of similar amount, one can get a "sort of" null when the two elements are rotated to the minimum astig position.

Rolando

June 25, 2011 12:27 AM Forum: CCD Imaging and Processing/Solar System