Lightbridge dark baffling

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Lightbridge dark baffling

Postby james s » Wed Oct 06, 2010 7:46 pm

Hi all,

The latest mod to my Lightbridge is an attempt to reduce the surface reflections from the inside of the upper OTA.

On a Lightbridge there's a lot of white and silver paint there and so masking it off with material which reflects light poorly seemed to be a good idea.

The material used here is self adhesive black felt which I cut to the right size and (after about three attempts) managed to get it stuck down without any creases, rucks or folds.

To be honest though it was very difficult and a little worrying, but it's done now and I'm quite pleased with the result.

All I have to do now is test it out!

Cheers!

This is the before photo...

[image]local://4552/981945BB0A6748C49194104E7615D541.jpg[/image]
james s
 
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RE: Lightbridge dark baffling

Postby james s » Wed Oct 06, 2010 7:46 pm

and the after photo...


[image]local://4552/047CD30BAF8F49AFB2FDDDB83353BF60.jpg[/image]
james s
 
Posts: 130
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RE: Lightbridge dark baffling

Postby james s » Thu Oct 07, 2010 9:40 am

Hi all,

I set up and tested the scope last night 06.10.10 and the results were astounding!
I'm seeing so much more detail now, since baffling the upper OTA.
M31 has become much larger and now has an eliptical shape...I've not seen it like this before.

So far, and under this very short-term test I can recommend this operation and I wonder if anyone else will try it?

james s
 
Posts: 130
Joined: Mon Feb 13, 2012 7:02 pm

RE: Lightbridge dark baffling

Postby cyclops » Sat Dec 04, 2010 4:50 pm

Good job!
There's coffee in that nebula!
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Location: Darlington UK

RE: Lightbridge dark baffling

Postby itisonlyme » Fri Dec 10, 2010 2:46 pm

Nice.

I may have a go at this on my Skywatcher as it too is very shiny, why do they do that?

Going to make a wrap around for the gap between the top and bottom parts first to stop the stray light entering from the sides first from the various street and garden lights.

How brave do I have to be when leaning in over the primary mirror?
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RE: Lightbridge dark baffling

Postby james s » Fri Dec 10, 2010 11:06 pm

Well, now after a slightly longer term test I can safely report this:

The night of the original test must have been an exceptionally clear night, because I've not seen M31 like it since...!
The scope is definitely darker and now after covering the truss tubes as well with the black felt I feel more confident in taking the scope out more often 'without' the lightshroud being necessary.
The scope is warmer/nicer to handle now the truss tubes are covered!

Also, it may be coincidence that I am finding it easier to locate and observe fainter objects and although I have seen the Pleiades many times through the scope, now they seem to 'jump out'.
...i'm sure the contrast is improved, or something...

Best regards!
james s
 
Posts: 130
Joined: Mon Feb 13, 2012 7:02 pm


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