(meteorobs) "Whizzer" - magnified and dissected

[Jim Wooddell]

I forgot to mention.  These bell jars are in fact pricey.
http://www.greatglas.com/PyrexBellJars.htm?gclid=CJnW84vEua0CFXO-tgodoSnF6A

What is nice about these is that they do not have a flanged end which causes 
major warping at the horizon.

I am looking at buying something like this to experiment.  Just looking 
through them in person, they are much cleaner than the plastic domes.

Would be interested in knowing if anyone has used these???

They  appear similar to the small glass dome that is used on the Moonglow 
camera.

Jim



Jim Wooddell
http://k7wfr.us



----- Original Message ----- 
From: "George Gliba" <gliba at milkyway.gsfc.nasa.gov>
To: "Meteor science and meteor observing" <meteorobs at meteorobs.org>
Sent: Thursday, January 05, 2012 10:55 AM
Subject: Re: (meteorobs) "Whizzer" - magnified and dissected


>
> How about surplus glass optical domes, like the one below?
>
> http://www.surplusshed.com/pages/item/m4065.html
>
> Starry Skies,
> GWG
>
>
>
>
>
>
> On 1/5/12 12:38 PM, Jim Wooddell wrote:
>> Hi Thomas,
>>
>> Yes the acrylic dome is a killer, for sure.  Most lens makers can supply
>> specifications on the warping created by the lens.
>> Sunex, for example, even has a program  called Dewarper to straighten out
>> warping issues on specific lenses they make.  So, with the plastic cover, 
>> it
>> just compounds the issues and  true optical dome covers are
>> pricey....$2k-10K.
>>
>> I have seen flower arrangements that use a glass dome/cover to protect 
>> the
>> flowers.  I wonder if these might be any good or just better than the
>> plastic domes???
>>
>>
>> Jim
>>
>>
>>
>> Jim Wooddell
>> http://k7wfr.us
>>
>>
>> ----- Original Message -----
>> From: "Thomas Ashcraft"<ashcraft at heliotown.com>
>> To: "Global Meteor Observing Forum"<meteorobs at meteorobs.org>
>> Sent: Monday, January 02, 2012 10:15 AM
>> Subject: (meteorobs) "Whizzer" - magnified and dissected
>>
>>
>> <snip>
>>> It would be nice to have a research-grade optical quality glass dome
>>> that the camera images through instead of the dense acrylic dome which
>>> is somewhat distorting.
>> <snip>
>>
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