(meteorobs) "Whizzer" - magnified and dissected

[Jim Wooddell]

Hi George,

You can see distortion in those just in their picture they display.  And, if 
you zoom in you can see flaws in the glass.

I was thinking more like Bell Jars such as:
http://www.greatglas.com/PyrexBellJars.htm?gclid=CJnW84vEua0CFXO-tgodoSnF6A


Jim




----- 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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