Ad Astra Observatory

My journeys among the stars

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Category: ATM

ATM

Re: BVC blank quote

PD by jimbo
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Good morning Mr. Harris, Our prices for the 14” and 16” BVC flat blanks are, BVC-14 $221USD BVC-16 $331USD And in the F/5 Pre-curved we have BVC-14F5 $261USD BVC-16F5 $385USD If you […]

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ATM / Optics

optical testing equations

PD by jimbo
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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

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ATM

optical testing

PD by jimbo
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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 […]

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RECENT UPDATE

Techniques

Polar Alignment Calculations

PD by jimbo
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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 […]

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Gear / Observatory / Telescope

Special Guest Star takes the mount at Hilltop O

PD by jimbo
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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 […]

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General / Maintenance / Observatory

Dome shutter is motorized again!

PD by jimbo
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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 […]

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ATM

Trixie 2017 – tube mods

PD by jimbo
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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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