ARCHIVE February2006
optical testing equations
http://home.earthlink.net/~burrjaw/atm/atm_math.lwp/atm_math.htm http://home.earthlink.net/~burrjaw/atm/odyframe.htm http://www.users.bigpond.com/PJIFL/ronchi_software.html http://www.users.bigpond.com/PJIFL/ronchi_index.html http://www.atmsite.org/contrib/Holm/invron/moreinvron.html
optical testing
So I’m thinking about building an optical bench, and what I’d like to do is something like this: 1) The tester and mirror are on the same rail. 2) The tester can […]
Astroscience
http://gathman.org/apologos/center.html
RECENT UPDATE
Polar Alignment Calculations
Here’s a page that derives Polar Alignment Calculations. (update 5/2020: the original site is gone, so I found the text on Wayback and am inserting it below. This is by the original […]
Gear / Observatory / Telescope
Special Guest Star takes the mount at Hilltop O
The Astro Jedi needed somewhere to store his light sab—- I mean, bucket, and I was only too happy to accommodate him. I have decided that I need to come to a […]
General / Maintenance / Observatory
Dome shutter is motorized again!
I finally decided to bite the bullet and fix the shutter motor. Things went sideways last winter, and I’ve been opening the shutter manually (and tying it shut with rope, so we […]
Trixie 2017 – tube mods
I finally got around to cutting the MTA-UTA tubes to length; the only eyepiece that would come to focus with the focuser spacer in place is the Televue 55mm Plossl. If I […]
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Deep Sky / Long Exposure Photography
NGC2244, The Rosette Nebula
Deep Sky / Long Exposure Photography
Another beautiful night.