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Posts Made By: Timothy Hornbeck

November 19, 2003 02:46 PM Forum: Telescope Making

Alt. Bearing Size?

Posted By Timothy Hornbeck
What size alt. bearing should I use for a 12.5" truss style scope. I have heard the bearing should be at least the dia. of the mirror size. I was thinking even bigger. My mirror box will be around 17" x 17". A 12.5" bearing would look really small against the mirror box.

Thanks in advance,

Tim Hornbeck

December 9, 2003 03:44 AM Forum: Off Topic Discussions

That's my boy ...

Posted By Timothy Hornbeck
Just took this picture of my 3 year old son and thought I would share. He likes to sleep with his books. Take note of the book he has in his hands.

Next he will be asking to borrow the 12.5" Starfinder =smile

Clear skies,

Tim H.


January 13, 2004 02:01 PM Forum: Telescope Making

Cell mount : Aluminum vs.steel?

Posted By Timothy Hornbeck
Any cons against making a cell out of aluminum stock?

12.5" - 2" Pyrex Mirror

I am going to mount my UO cell into a mirror box by making a cell frame. The UO has three mounting points, so I am going to make a frame that would accept these mounting points.

- Tim

January 26, 2004 10:06 PM Forum: Off Topic Discussions

I want to believe ...

Posted By Timothy Hornbeck
http://www.whittlesea.vic.gov.au/content/content.asp?cnid=1545#

Saw this on sci.astro.amateur

We'll see how far this goes.

- Tim H.

January 27, 2004 03:17 AM Forum: Equipment Talk

Reading Collimation Pattern

Posted By Timothy Hornbeck
I recently read the thread about aligning the focuser of a refractor to the lens. So tonight I tried it with my ST80. The two circles were off. So I loosened the three screws that held the focuser to the tube and was able to get the two circles to line up a lot closer. I still need to get the slop out of the draw tube and it should be even better.

Here's my question... I also tested my Meade 390 an noticed something completely different. I saw 3 circle patterns. One was violet-purple, one was clear and the other was smaller and clear positioned between the other two. The pattern was positioned from 10 o'clock, centered, 4 o'clock.
I loosened the focuser to see if I could get them lined up and I couldn't. What's causing this? Could the doublets be positioned incorrectly in the cell?

Thanks in advance,

Tim Hornbeck

February 2, 2004 07:57 PM Forum: Binoviewers

Siebert Contest Guess

Posted By Timothy Hornbeck
The chrome tube breaks apart in three sections that are threaded. The first segment (closest to the binoviewer) contains a double element design. The second segment (middle) is just a spacer without elements. The third segment (lower) is also a double element design. Multiple magnification (1.5x, 2.0x, 3.0x, 3.5x, 4.0x, and 7x) is achieved through various combinations of stacking and/or reversing the segments with or without the spacer.

- TIm Hornbeck

February 5, 2004 05:42 PM Forum: Film Astrophotography - Imaging and Processing

Re: Things a little slow for film?

Posted By Timothy Hornbeck
Last Saturday I was able to take some shots of the 1st qtr. moon and Saturn with my ST80 @ prime focus with my OM-1. It was really cold, but think I took a dozen or so pictures. I was able to get some Kodak 100ASA, 36 exp. film for dirt cheap. So I got a ways to go before the roll is finished. If the shots turn out I will post.

Clear skies and warmer weather,

Tim Hornbeck

February 8, 2004 07:17 PM Forum: Film Astrophotography - Imaging and Processing

Shot #2 from second roll of film ...

Posted By Timothy Hornbeck
Here is another shot of the Milky Way (Cygnus) from my back yard. OM-1, 28mm Zuiko, 800ASA, ~40 sec. on photo tripod. Pointing straight up at zenith.

Clear skies,

Tim H.

February 20, 2004 10:58 AM Forum: Telescope Making

Opinions on Reflector Crayford focusers ...

Posted By Timothy Hornbeck
Look for opinions on a good Crayford style focuser for a reflector. I am working on a truss conversion project and need to decide which unit to use. I really don't want to install a Synta R&P style now (I actually have) and then upgrade later.

Thanks and clear skies,

Tim H.

February 29, 2004 05:16 AM Forum: Equipment Talk

Meade Starfinder Mirrors ...

Posted By Timothy Hornbeck
Does anyone know who makes the mirrors for the Meade Starfinder line? Are they ground in-house or made by another company? I have a 12.5 f/4.8 that was made 3/11/99. It looks like there are initials "J.L." and "G.P." in marker on the bottom.

Thanks,

Tim H.

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