MOST RECENT
Re: ASTROMART – Response to ad #562793
I asked the original owner of the 13” mirror for some information so I could start working up a .. er.. “balance” sheet for the scope. I’m not doing cost analysis — […]
Camera at the Newtonian focus
My D70 is 5.5”x4.4”. That’s a coverage of 24.2in^2. A 13.1” mirror has an area of 134.78in^2. That’s a 17% obstruction. Even if I mounted the thing on a 5.5” disc, basically […]
Blue CR-1
Art asked if he could buy the blue CR-1 focuser that’s been sitting in my parts box. Until a day or two ago, I didn’t have a use for it. But now, […]
Astro knowledge / Deep Sky / Long Exposure Photography / Optics
Astrophotography in the slow lane
With most beginner astrophotography, a desire for fast optics (and the resulting short exposure lengths) is paramount. Unfortunately, fast optics necessarily mean wider FOV. This is not a problem when you have […]
Trixie's on the way
I bought a 13.1” f/4.5 mirror and matched 3.1” secondary today for $400. It used to be a Coulter red-tube Dob, but I’m just getting the mirrors. They will turn into the […]
Uncategorized
Re: strange grayscale again
Art Morton wrote: > J, > > Can you make a blue channel out of a green and red? That is strange > to end up without a blue. I think that […]
Solar System Photography / Technology
AVI repair
http://www.pk3.org/Astro/index.htm?software_utils.htm
Gear / Solar System Photography / Techniques
Planetary camera / webcam autoguider
The other morning when I was awakened at 5am by sprinklers, I noticed that Jupiter was past meridian (meaning so was Sagittarius, but it was too light for me to see it). […]
Maintenance / Observatory / Technology
Re: Mac-as-Astro-machine
I just picked up a Mac mini to use as an astronomy machine out in the observatory. Essentially, I need something that can run headless, and provide USB ports to the various […]
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.