Category: ATM
Re-2: MPCC hyperbolic mirror overcorrection factor
Dear Mr. Harris, if you decide to reduce your usable field to APS-sized CCD’s it may be ok with 38mm free lens diameter in terms of vignetting and with acceptable spot-size down […]
Re: scientific journal article
Some colleges or their libraries subscribe to sites that supply scholarly articles. I need a copy of the second article on the following list: http://scholar.google.com/scholar?q=Anastigmatic+catadioptric+telescope&ie=UTF-8&oe=UTF-8&hl=en&btnG=Search However, all I can get is an […]
Re: scientific journal article
Lemme know if this doesn’t help. D <http://scholar.google.com/scholar?q=Anastigmatic+catadioptric+telescope&ie=UTF-8&oe=UTF-8&hl=en&btnG=Search> — “Jimbo S. Harris” <jimbo@jimbo.net> wrote: > D, > > Do you know how I can find this… cheaply? > > Title: > Anastigmatic […]
Re: BVC blank quote
Good day Mr. Harris, I have replied to each of your question below. Jimbo S. Harris wrote: > Mr. Gentile, > > Thank you again for your quick responses. > Here is […]
Re: Baader MPCC and a f/3.3 Newtonian?
Jimbo, It was a pleasure for me to speak with an enthusiastic person who is working on an exciting project. Please keep in touch. I would enjoy seeing an astronomical image or […]
RE: Baader MPCC and a f/3.3 Newtonian?
Hello Jimbo, Sorry for the slow reply, just returned from a week trip to China. That is an ambitious project! (an f/3.3 mirror has to be a real bear to produce well). […]
field corrector calculations
http://www.users.bigpond.com/pjifl/page14.html 3 different correctors, with primary SC, and glass type.
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 […]
MOST COMMENTED
Observatory
Observatory 2.0 – Time has come today!
General / Maintenance
First Light, a deeper look
Mount / Observatory / Telescope
Observatory 2.0 – Result!
Observatory
Observatory 2.0 – The Pier goes in
Gear / General / Maintenance
Martin Farmer Wormblock installation notes
Deep Sky / Long Exposure Photography
NGC2244, The Rosette Nebula
Deep Sky / Long Exposure Photography
Another beautiful night.