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kaaikop
sage
Reged: 07/13/08
Posts: 460
Loc: Ste-Therese, Canada
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A picture is worth a 1000 words:
And this is on the inner tube:
This happened last winter, I was just starting out, and did not think about condensation.
Tube was outside at -20C, taken inside at +20C...
I did the mistake of laying the tube vertical (on it's lens cap).
Fortunately, nothing on the mirror, so maybe vertical was the right thing to do...
My question is... Is it worth bothering about it?
I have heard about "flocking" the inside of tubes...
With these conditions, that might not be a good idea, it would "retain" the humidity?
Is there an "easy" way to open the tube, without having to re-align everything?
Anyone else seen this before?
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
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Joe Aguiar
professor emeritus
Reged: 02/10/07
Posts: 707
Loc: Toront,Ontario
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I would say let it dry out. I am sure it wont bother the performance of the scope, unless it bothers you.
Joe
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kaaikop
sage
Reged: 07/13/08
Posts: 460
Loc: Ste-Therese, Canada
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It's not wet... (has been there for probably 8 months).
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
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rmollise
Carpal Tunnel
Reged: 07/06/07
Posts: 1564
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Quote:
It's not wet... (has been there for probably 8 months).
It won't hurt anything. Leave it alone.
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Uncle Rod
Watch for Rod's New Book:
Choosing and Using the New CATs--coming soon!
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deSitter
scholastic sledgehammer
Reged: 12/09/04
Posts: 755
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Man Cats are a pain - maybe we should all have a drain plug installed..
-drl
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Midnight Dan
professor emeritus
Reged: 01/23/08
Posts: 558
Loc: Brockport, NY
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Looks more like grease from the baffle tube. I've seen several other threads about grease doing this on some of the newer Celestrons. Apparently the quality of grease in use is different than it used to be. Here's a recent one:
Grease problem
-Dan
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Scopes: Celestron NexStar 8, Orion EON 72mm ED/APO on Astroview mount (EQ3)
Eyepieces: Celestron 40mm, 25mm, Baader Hyperion 13mm, 8mm, 5mm
Other: Telrad, 2x Barlow, 0.63x Focal Reducer, Dew-not strips, DewBuster controller
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davidpitre
Pooh-Bah
Reged: 05/10/05
Posts: 1408
Loc: Central Texas
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Benoit,
This is oil that has separated from the grease behind the mirror.
1st. Check the threads currently addressing this in the Celestron Nexstar/CPC forums here.
2nd. You should probably remove the corrector and clean it up, especially off the baffle tube, as it will drip onto your corrector if pointed down. Before doing this get advice and instructions on the same forum.
3rd Don't store your scope corrector down. This grease will continue to drip. Store the scope horizontally or 45° up.
I've had the same problem, and it sounds like this is becoming very common. It's not a big deal to with.
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David
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kaaikop
sage
Reged: 07/13/08
Posts: 460
Loc: Ste-Therese, Canada
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makes sense... oil... that would explain why it's shiny.
Now my OTA is leaking oil, LOL (actually not funny, Im not really impressed with the Celestron quality...)
Under these circumstances, would it still make sense to flock the inside of the tube?
--------------------
Benoit, RASC Montreal
-C 9.25XLT on EQ6 Pro / ED80SF on Portamount
-Plossls, Radians, Naglers, LVW's & Orthos.
-a pair of 7x50's
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davidpitre
Pooh-Bah
Reged: 05/10/05
Posts: 1408
Loc: Central Texas
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Well, the scope needs to be taken apart and the runny grease replaced.
I don't think there is much consensus as to whether flocking makes a noticeable difference in contrast, but it sure can't hurt.
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David
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