- Utah-Astronomy - mailman.xmission.com

Grim for the weekend
by Michael Carnes 13 Apr '04

13 Apr '04

I've been looking forward to my first trip to the Wedge Overlook this weekend. What I've been seeing on the weather for the last several days does not make me happy. Grrrr...

5 6

RE: [Utah-astronomy] seeking advice
by Michael Carnes 13 Apr '04

13 Apr '04

Joe, Blowing it off is the safest thing to do. If you've got crud on the inside of the corrector or on the secondary, you can tape a plastic soda straw to the end of a blow bulb (use the type of straw that has the bending zone). You can then insert this through the mirror cell (where the diagonal goes in), and carefully maneuver the end of the straw into place under the corrector. Unless you've got negative pressure near the mirror cell, this still means that the dust is only displaced inside the scope, but with a little luck it will land on the inside of the tube. Of course, if it lands on the mirror, you haven't really improved anything. I successfully used this technique to get a nasty blob off the secondary in my 5". But as most others have said, little tiny specks of dust won't really cause a lot of harm. Michael -----Original Message----- From: "Don J. Colton" <djcolton(a)piol.com> Sent: Apr 13, 2004 9:16 AM To: Utah Astronomy <utah-astronomy(a)mailman.xmission.com> Subject: RE: [Utah-astronomy] seeking advice Hi Joe Just blow it off with a hand bulb blower like they sell at camera stores. Do not use compressed air. Do not use any liquids they just make it worse. I have never seen any improvement when using the scope after cleaning. Clear Skies Don Colton -----Original Message----- From: utah-astronomy-bounces+djcolton=piol.com(a)mailman.xmission.com [mailto:utah-astronomy-bounces+djcolton=piol.com@mailman.xmission.com]On Behalf Of Joe Bauman Sent: Tuesday, April 13, 2004 8:50 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] seeking advice Hi Brent, Maybe I didn't pharse that right. It's an SCT. I don't want to clean the mirror, just the surface of the glass on top, immediately under the lens cap. I thought that was the corrector plate, but maybe I'm wrong! -- Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy(a)mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy(a)mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com

3 3

RE: [Utah-astronomy] seeking advice
by Dale Hooper 13 Apr '04

13 Apr '04

Joe, I've cleaned my corrector plate a couple times over the 6 years that I've had my 10" LX200. Here are a few good references. I've, of course, always waited until there was a pretty bad "dirty film" on the corrector before cleaning it. You could also search the archives at mapug.com According to "thee" LX200 guru - Doc G., the correctors on the LX's are pretty resilient. However, keep in mind what Dr. Clay says..."Although we are attempting to obtain the best possible light transmission efficiency from our optics by cleaning them free of deposits, film and debris, lock firmly in your memory that cleaning coated optical surfaces is the single-most damaging action that will be done to them, short of actual physical damage or breakage. No matter how careful, how delicate, nor what cleaning solution is used.....every time cleaned will result in a microscopically-reduced optical performance than before cleaning." http://easyweb.easynet.co.uk/~chrish/lx_corre.htm http://m1.aol.com/kewtasheck/corrector.html http://www.arksky.org/asoclean.htm > -----Original Message----- > From: Joe Bauman [mailto:bau@desnews.com] > Sent: Tuesday, April 13, 2004 8:13 AM > To: Utah Astronomy > Subject: [Utah-astronomy] seeking advice > > > Hi, I'm hoping one of our list folks can give me some information as > soon as convenient. I'm planning to head out for some > astrophotography soon, and as I was working on some problems (like > making a hyperfocal lens), I had the telescope set up during the > daytime. This gave me a good look at the corrector plate and it was > fairly dusty. The last time I cleaned a corrector plate was with my > old Celestron 8" and I really screwed things up -- I took the > corrector off and failed to note its alignment, so I got it back on > wrong. I was never again able to collimate it well. Now with my new > 12" I don't want to make mistakes and I won't be taking the corrector > off. > > What I would like someone to tell me -- particularly an experienced > old hand like Patrick, Chuck, Siegfried, Bruce, etc., etc. -- is a > good, safe, quick way to clean the dust from the surface of the > corrector. Any suggestions? Or does anyone have any stories to share > on this? > > Thanks very much, Joe > > _______________________________________________ > Utah-Astronomy mailing list > Utah-Astronomy(a)mailman.xmission.com > http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy > Visit the Photo Gallery: http://www.utahastronomy.com > >

5 5

RE: [Utah-astronomy] Interesting view
by David Dunn 13 Apr '04

13 Apr '04

I guess that technically glaciers flow. I don't think they are very gentle though. Dave -----Original Message----- From: utah-astronomy-bounces+david.dunn=albertsons.com(a)mailman.xmission.com [mailto:utah-astronomy-bounces+david.dunn=albertsons.com@mailman.xmission.co m] On Behalf Of Joe Bauman Sent: Wednesday, April 07, 2004 1:29 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Interesting view Not too much on chronology that I know of, except Rover scientists believe the rocks were laid down in "gently flowing liquid water," a description posted by Cornell University. (It's hard to understand how it could be gently flowing if it wasn't liquid, but that's an issue for the Department of Redundancy Dept.) -- Joe _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy(a)mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.utahastronomy.com

9 12

Re: [Utah-astronomy] seeking advice
by Michael Carnes 13 Apr '04

13 Apr '04

That's mean. I like it. >If you are in your 40's or older and want a laugh, get >ahold of an old rotary phone and watch a teenager try >and use it... >("The buttons are fake, dad, they don't do anything!")

1 0

Re: [Utah-astronomy] seeking advice
by UTAHDEB＠aol.com 13 Apr '04

13 Apr '04

Joe, I'm not an expert on cleaning lenses but wouldn't a hairdryer blow some of the dust off? I would use a low setting to do this. Guys, is this a safe method? I know some people use a hairdryer for dealing with dew. Debbie

1 0

Re: [Utah-astronomy] OT: Monitor effects
by Josephine Grahn 08 Apr '04

08 Apr '04

Chuck, Could be related, .. How old are you? Jo Grahn At 12:20 PM 4/8/2004 -0700, you wrote: >Any list members notice a degradation in their >eyesight once they started using a computer regularly? > >If you have been using one regularly for more than 10 >years, please do not reply. > >This is really OT, so reply off-list if you have a >tale to tell me, or can cite reliable published >research. > >Thanks > >C.

2 1

OT: Monitor effects
by Chuck Hards 08 Apr '04

08 Apr '04

Any list members notice a degradation in their eyesight once they started using a computer regularly? If you have been using one regularly for more than 10 years, please do not reply. This is really OT, so reply off-list if you have a tale to tell me, or can cite reliable published research. Thanks C. __________________________________ Do you Yahoo!? Yahoo! Small Business $15K Web Design Giveaway http://promotions.yahoo.com/design_giveaway/

1 0

have a nice day
by Chuck Hards 08 Apr '04

08 Apr '04

Check out this eBay auction: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=3807390319&category=58&s… Kroll was one of von Braun's assistants. I love the inscription on the photo. Wonder if they painted the same message on the rocket's nose, for the benefit of Londoners? ;) C. __________________________________ Do you Yahoo!? Yahoo! Small Business $15K Web Design Giveaway http://promotions.yahoo.com/design_giveaway/

1 0

News availability
by Patrick Wiggins 08 Apr '04

08 Apr '04

Brent and Dave's posts prompt me to mention here that my newsletter, News, is available to anyone who wants to receive it. If you'd like to receive it just ask. Patrick -- Patrick Wiggins NASA Solar System Ambassador to Utah http://planet.state.ut.us paw(a)trilobyte.net

2 1