Dean W. Armstrong

This is a split screen image of Yerkes Observatory in the visual and near-infrared. I moved the camera in between images and wasn't plan...

I have placed most of the near infrared images I've taken at http://www.lib.uchicago.edu/~dean/infrared/ . All of the images were norma...

This Saturday members of the Ryerson Astronomical Society visited Yerkes Observatory to use the 41-inch reflector. Luckily the clouds clea...

Plus, a graph of the transmission of fully exposed and developed color negative film, from recorded by here : This helps explain how dust r...

Steven conveniently graphed the data from my geiger counter, covering a week in the Ryerson Astronomical Society office. http://gateway.spc...

This was a trip to Las Vegas. Maximum altitude was at 39,000ft, and the flightpath was a relatively northern one across Nebraska and Colora...

I added a third layer of color negative to the filter, and this makes the sandwich completely opaque to the naked eye. The sun is barely vi...

http://www.lib.uchicago.edu/~dean/blog/ir1.jpg http://www.lib.uchicago.edu/~dean/blog/ir2.jpg http://www.lib.uchicago.edu/~dean/blog/ir-norm...

A nice image of exaggerated maria colors on the Moon: http://www.rc-astro.com/img/moon_colors_2005-04-18_web.jpg. Visually, you can see this...

Another down. However, this rejection letter was very nice, as opposed to Arizona's. Mahalo, Hawaii.

I've been away. I didn't do much. I note that I heard many more stations in Nevada with an Icom R-71a in the 15 MHz and 17MHz broa...

3 down.

Bad Astronomy Bulletin Board :: View topic - Evidence of current life on Mars A followup to a previous post.

A long time ago I dabbled in Very Low Frequency radio. These are radio waves with frequencies under 20kHz. They have obscenely huge waveleng...

I bought a 55mm f/1.8 Pentax screw mount lens off of Ebay last week to use as a wide-field imager in front of the Starlight Express SXV-H9 C...