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Posts Made By: Chris Brown

January 18, 2006 05:26 AM Forum: Telescope Making

Tube material for refractor project

Posted By Chris Brown

Hi, All!
I recently bought a 95mm f4.1 triplet on astromart, and I also found a suitable focuser...
My question is, what should I fashion the tube from? PVC?, ALU?
Have any of you had luck with this kind of project?
Thanks for any advice given!
Chris Brown

January 19, 2006 04:32 AM Forum: Refractors

Advice needed on Cooke triplet..,

Posted By Chris Brown

Hi,
I'm really new to refractors, and I need some help. I recently purchased a Cooke triplet of 95mm f/4.1 dimentions in hopes of building a wide field scope.
It was manufactured by Buhl in PA., thier websight shows a long history, and alot of projector lenses!!
Is there any hope for this little oddball for an acceptable wide-field instrument or finder?
Any info would be greatly appreciated!!
Chris Brown

January 23, 2006 05:58 AM Forum: Eyepieces

Meade SWA 20mm

Posted By Chris Brown

I just bought(used) one of these, I have never seen one before!!
What is it worth?
I have never seen one at this focal length...Meade's ads don't mention one...is it old?
Comments??
CB

March 2, 2006 05:10 AM Forum: Refractors

Newby needs help with triplet refractor!!!

Posted By Chris Brown

HELP!!
I just finished building a wide field refractor from a cooke triplet (96mm f/4.1) and a star test shows a tight pinpoint on Rigel, but I have this dim circle of light around the star, off center, filling half the field!
I can't completely center the star in this circle of light, moving the focuser around only helps slightly, but the circle remains...
When de-focusing in, the star shows a nice concentric circle, but de-focusing out, the star scatters, and disappears!
I have throughly baffled the short tube with black velvet, and I can see no internal reflections...a laser in the diagonal comes out the center of the front lens.
Is it possible that one of the three elements have shifted?
Please forgive my ignorance...what I don't know about refractors can fill a book!
CB

May 15, 2006 04:19 PM Forum: Solar System Observing

Moon Filter??

Posted By Chris Brown

Hello, All!
I was wondering if any of you actually use a Moon filter of any type...
I replaced my XT-8 with an ETX-125 OTA on a Meade #826 EQ (The mount this tube should have had all along!)and I am interested in doing some long-term Moon observing, stuff like riles, domes, craterlets in Plato, etc...
In the past, I just "Bashed Through" without one, but I am starting to reconsider, being sick of seeing a "Blue Dot" every time I observe the Moon!
Comments?
Thanks!!
CB

July 25, 2006 09:29 PM Forum: Deep Sky Observing

The best portable deep-sky scope is....

Posted By Chris Brown

A matter of budget for me, so I have rounded it down to Orion's ST130 eq (5.1 inch, 600mm fl), or a Meade AR-5 refractor...
The old 200mm dob is killing my back!!
Thoughts??
Suggestions??
Thanks!!
CB

July 26, 2006 04:44 AM Forum: Maksutovs

Wide field adaptor with ETX-125

Posted By Chris Brown

Hello!
Has anyone had the chance to use a wide field adaptor (diagonal, really!) on a ETX-125?
I know they are usually advertised for the ETX-90, but I am looking for a wider field...
Thanks!
CB

September 8, 2006 06:35 PM Forum: Reflectors

Just got a Starblast!!!

Posted By Chris Brown

I just got my Orion Starblast EQ, and so far the results are promising...Three craterlets on Plato, nice round defraction rings, and a pretty flat field! I have taken it as high as 180x, and as low as 14x, great optics, so far!!
Nice mirror mountings, even the EQ-1 is up to the task!
Gotta remove the Glue/Grease from the focuser, though!
More to come...
CB

September 10, 2006 06:01 AM Forum: Reflectors

Orion Starblast: An update

Posted By Chris Brown

Well, my wife saw the big cardboard box on the porch, so quickly I told her (with a red face) that it was another new telescope. "How long are you gonna keep this one?", she asked...
A fair question, seeing that as of late, I had been swapping telescopes like most backyard astronomers swap eyepieces, and I told her that this was the last one for awhile...I don't think she believed me...
I just had a few hours under a clear suburban sky with my new Starblast EQ, and here is what I found...
First, eyepiece choice is important! It loves my Russell 36mm Hybrid (mild coma just at the edge), but hates my Meade 20mm superwide (china), which shows extreme coma just 50% out of center, but a circle-T 20mm erfle works wonderful, as does a GSO 8mm wide angle! The rest of my eyepieces are Sirius Plossls, in 12.5, 10, and 7.5mm, which work well also.
I use an Orion 3x barlow (Long!), but it is perfect for this scope, the only eyepiece that has trouble with it is the supplied 6mm Expanse.
The scope shows alot more stars than my old optically excellent(REALLY excellent!) ETX-125, and the Cygnus region is just fantastic in this scope, a real starblast! (my apologies!)
This little scope splits Albiero at just 12.5x, and shows a wonderful star field with it, and M57 jumps out at me even at 22.5x, donut hole, and all!
I went searching for my favorite deep-sky sight, the little carbon star T-Lyra, and it was easy to pick it's red hue amid the surrounding white stars, and with the included 15mm expanse, it was Hugely RED!!I was never quite able to catch this star with my ETX-125, probably due to the smaller FOV...I tried E lyra next, and found that I needed 108x for a clean, double split on this night. I then aimed at the moon, and found 3 craterlets on Plato at 168x, and I still had a nice image at 180x! Not to bad for an f/4 system!!
After owning 2 ETX's (a 90, and a 125), an XT-8, along with a home-built 96mm f/3.1 refractor, and 2 sets of binoculars, I think I finally found a telescope that works well for my special observing habits! I needed a telescope that would show nice views of the moon and planets, and also show acceptable deep-sky views from my backyard. I also wanted to see all of Brocchi's cluster (really beautiful at 22.5x!) and the seven sisters in a single FOV! Most importantly, I needed a telescope that was highly portable, and I am pleased to report that I can lift and carry the Starblast EQ with one hand!!
Once I get the grease out of the focuser and tighten the tripod up (it can be shaky at 100x-plus powers!)I think I'll have finally found a telescope that I can live with for a very long time!
I think my wife will be relieved...
CB

September 10, 2006 05:40 PM Forum: Solar System Observing

Who else sees black dots cross the moon?

Posted By Chris Brown

I'm sure I'm seeing satellites, there must be thousands up there!
Last night, I was observing Plato with my Starblast, and I saw a couple really fast ones, but one was really slow, a small round dot, it took about 10 seconds to cross the FOV at at about 80x! It was perfectly round, and about the apparent size of plato...
Tell me i'm not crazy!!
CB