[Chaos-l] lunar filter, Bynum bridge, Dob tubes

[Terry Crook]

2" filter? Do you have a 2" eyepiece? Didn't know 
they made them that large, but then there's lots 
I don't know about telescopes!  :-D

The Bynum old bridge sounds like a grand site for 
stargazing. I'll pencil in that first Thursday in January & await further word.

OTOH, while I'm waiting on replacement of my 
Declination drive gear for my Celestron 80mm 
refractor, I found an unused video camera tripod 
which we may be able to with my binoculars (with 
some crafty construction of a mounting bracket, etc.).

BTW, I have painted two ex-Duke Dobsonian tubes 
an attractive Forest Green & will bring'm back to Jayme some day soon.
It'll not likely be warm enough again for outdoor 
painting soon... but I could do so in his barn, maybe?


Merry Christmas All !


At 02:03 PM 12/21/2007, Rob't N wrote:
>Michael,
>
>First of all, definitely get some sort of filter ... the moon is so
>bright I see dark spots for minutes after viewing it sometimes (like at
>Morehead observing sessions).
>
>And if you can afford it, I'd go with John's suggestion - the variable
>polarizing filter.  The reasoning (and likely the reason why there is a
>13% and a 25% non-variable filter) is because the brightness of the moon
>varies greatly ... from when it is full (and I can project an image onto
>my palm six inches from the eyepiece) to when it is a quarter or less.
>With the variable version, you can set the brightness as you like.
>
>Robert  (who is moving to a 2" filter this Christmas ... if Santa thinks
>I've been a good boy)
>
>Michael Hrivnak wrote:
> > I would like to get a lunar filter for use 
> with my 8" dob.  Should I get one
> > that passes 13% of light, 25%, or one of these variable ones that are
> > adjustable between about 1-40%?  Or maybe I should get the 13 and 25?
> >
> > I'm would appreciate any insight on how the adjustable ones work.
> >
> > Thanks,
> > Michael
> >
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TaurusTerry in Chapel Hill, NC
35° 57' N  79° 02' W

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