Fogging inside scope
Moderator: SAC Committee
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- Location: Ballycasey, Co. Clare
Fogging inside scope
The last few nights I've used the club 10"
the inside as well as the outside of the
Ota is fogging up.
I brought it in and let it dry out but
There now appears to be beads of dried in
water left behind.
Will this need to be cleaned?
I'm sure it wont effect the viewing
that much but I am concerned with
The build up of moisture on the inside
Because of what it might do to the mirrors.
the inside as well as the outside of the
Ota is fogging up.
I brought it in and let it dry out but
There now appears to be beads of dried in
water left behind.
Will this need to be cleaned?
I'm sure it wont effect the viewing
that much but I am concerned with
The build up of moisture on the inside
Because of what it might do to the mirrors.
- Dave Lillis
- Posts: 2757
- Joined: Sun Aug 05, 2007 10:02 am
- Location: Limerick city
Where is the dried in beads?, the water in itself isnt dangerous but what it can do is trap contaminant acids on the mirrors and very eventually etch it, this is why open tube dobs need recoating every 10 years or so, for SCTs its a much rarer occurance.
If its on the corrector plate, then watch out for mildew, if it forms it will etch the anti-reflective coating off it when you go to remove it.
BUT, a once off like this isnt worth worrying about, unless it was completely destroyed, how about putting up a pic of it...
If its on the corrector plate, then watch out for mildew, if it forms it will etch the anti-reflective coating off it when you go to remove it.
BUT, a once off like this isnt worth worrying about, unless it was completely destroyed, how about putting up a pic of it...
Dave L. on facebook, See my images in flickr
Carrying around my 20" obsession is going to kill me, but what a way to go.![Smile :)](./images/smilies/icon_smile.gif)
Carrying around my 20" obsession is going to kill me, but what a way to go.
![Smile :)](./images/smilies/icon_smile.gif)
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- Posts: 2980
- Joined: Sun Aug 05, 2007 2:45 am
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![Image](http://farm3.static.flickr.com/2746/4241773156_a8f78c2793_o.jpg)
![Image](http://farm5.static.flickr.com/4005/4241009479_4715e85aa4_o.jpg)
![Image](http://farm5.static.flickr.com/4017/4241781190_a377e62499_o.jpg)
The inside is now 100% dry.
I'm concerned though with this new development.
Maybe it was always the case , just the scope has not been used
as much by the same person.
It's plainly obvious a dew shield / heater is needed for this.
Oh, and the scope was cooled sufficiently before placing outside
so it wasnt a case of taking direct from warm to freezing.
Either way, quick fogging at near 0 degrees is a pain in the A**.
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- John O'Mahony
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- Location: Limerick, Ireland
- Dave Lillis
- Posts: 2757
- Joined: Sun Aug 05, 2007 10:02 am
- Location: Limerick city
Go to a pharmacy, get some isopropyl alcohol and surgical cotton and wipe the corrector, use allen keys to take off the corrector but for god sake make sure you put it back on in the same rotational orientation or the scope will be kyboshed!
Use a marker+stickers to mark the orientation.
Use a marker+stickers to mark the orientation.
Last edited by Dave Lillis on Mon Jan 04, 2010 11:04 am, edited 1 time in total.
Dave L. on facebook, See my images in flickr
Carrying around my 20" obsession is going to kill me, but what a way to go.![Smile :)](./images/smilies/icon_smile.gif)
Carrying around my 20" obsession is going to kill me, but what a way to go.
![Smile :)](./images/smilies/icon_smile.gif)
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- Posts: 2980
- Joined: Sun Aug 05, 2007 2:45 am
- Location: Ballycasey, Co. Clare
- Dave Lillis
- Posts: 2757
- Joined: Sun Aug 05, 2007 10:02 am
- Location: Limerick city
I've done it to my own scope numerous times and it was the second thing I did to the club scope when I got it.
I can come out during the week if you like.
I can come out during the week if you like.
Dave L. on facebook, See my images in flickr
Carrying around my 20" obsession is going to kill me, but what a way to go.![Smile :)](./images/smilies/icon_smile.gif)
Carrying around my 20" obsession is going to kill me, but what a way to go.
![Smile :)](./images/smilies/icon_smile.gif)
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- Posts: 2980
- Joined: Sun Aug 05, 2007 2:45 am
- Location: Ballycasey, Co. Clare