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Posts Made By: Dennis Sheridan

March 2, 2006 11:26 AM Forum: Beginning Astronomy?

Should I or shouldn't I

Posted By Dennis Sheridan

As as starter scope I've been working on a copyscope (what can I say, it's cheap uh-uh inexpensive.) The lens is a plummer f/4.5, FL 229mm, the aperture is 75mm. I don't think there's one iota of plastic in it, it's all metal and glass and mucho heavy.

Now the question, would it be worth the trouble to crack this moose of a lens open and use the lenses to make a physicaly longer and lighter scope.

Many thanks.

March 2, 2006 10:59 PM Forum: Beginning Astronomy?

Mirror differences.

Posted By Dennis Sheridan

Paraboloid/spherical what are the differences (aside from contour?) which one would make the better scope?

April 24, 2006 03:28 PM Forum: Equipment Talk

Will this mount holdup?

Posted By Dennis Sheridan

What would be the general opinion of this http://cgi.ebay.com/Meade-DS-2090AT-TC-refractor-with-Autostar-20095-RE_W0QQitemZ7595668078QQcategoryZ74928QQcmdZViewItem scope and mount and specificlly would the be able to holdup using an older film camera (no plastic just good old alum. and brass)?

My first foray into refractorville (copyscope) didn't work so good, so now I'm going to try to talk mama out some of the tax money and pick up a reasonably decent scope.

Meade also has a 70mm short tube fork mounted with the 494 tracking & GOTO system and the electronic eyepiece.

I am leaning toward the long tube mainly because of the aperture and the eyepieces.

Your opinion?

August 23, 2006 09:04 PM Forum: Film Astrophotography - Imaging and Processing

Camera, where?

Posted By Dennis Sheridan

After I finally got my BD Tracker going in the right direction, UP, bgecause my drive motor goes CCW. I had to make some gears out of Lexan.

With that taken care of the question now is which end of the camera board to put the the camera. I have seen pictures of different trackers and the position varies from the upper end to the hinge end. I are confuzzed, where is the optimum position.

Below is picture of first iteration, the drive has changed and the finder will be repositioned.


September 16, 2006 09:14 PM Forum: Astro Binoculars

20X80 Humvee's

Posted By Dennis Sheridan

Yesterday i took delivery of a pair of 20X80 Humvee's from sportsmans Guide thru Amazon.com. they seem to be well made, everything fits well and no rattles.

Wouldn't you know it though that the curse came with them, cloudy skies and ocassional rain.


December 4, 2006 12:35 AM Forum: Home Observatories

A different dome

Posted By Dennis Sheridan

Tonight while watching a program the cosmos and such I caught a quick glimpse of an interesting dome or should I say come (say with a hard "o".) It was conical shaped with a couple of thin shutters. Hard to tell the diameter or height as like I say it was only on for a quick glimpse.

December 24, 2006 05:53 PM Forum: Off Topic Discussions

The season

Posted By Dennis Sheridan

Merry Christmas
&
Happy New Year

From the land of Cheese, Trees and Ocean Breeze


January 2, 2007 05:23 PM Forum: Off Topic Discussions

Cell phone numbers

Posted By Dennis Sheridan

Subject: CELL PHONE NUMBERS

JUST A REMINDER....8 days from today all cell phone
numbers will be released to telemarketing companies and
you will start to receive sales calls.
YOU WILL BE CHARGED FOR THESE CALLS.... To prevent this,
call the following number from your cell phone: [COLOR="Fuchsia"]1-888-382-1222. [/COLOR]It is the National DO NOT CALL list. It will only take a
minute of your time. You can also register at the website [COLOR="Lime"]www.donotcall.gov[/COLOR].

It blocks your number for five (5) years.
HELP OTHERS BY PASSING THIS ON TO ALL YOUR FRIENDS!

March 3, 2006 04:52 PM Forum: Beginning Astronomy?

Mirror differences.

Posted By Dennis Sheridan

Phew, that's quite a lump for this old GI to digest. The reason I asked is that I purchased a Jaegers F7.4 spherical non-aluminized mirror. It was suggested on another forum that refigure it to paraboloid without a real explanation as to why. he did suggest a book, Standard Handbook for Telescope Making by Neale Howard, which I'm thinking of getting.

Never having ground a mirror let alone put a particular contour on one, the task seems rather daunting.

March 6, 2006 09:13 PM Forum: Beginning Astronomy?

plossls so many to choose ?

Posted By Dennis Sheridan

Check these folks out they have some Plossl packages and the prices don't seem to bad.

http://www.geckooptical.com/anttlers_optics/index.html