Re: [ATM] An intriguing toy

[Bevan Harris <ngc2070@bigpond.com>]

I accidentally sent this to Jarvis instead of the list.

Bevan Harris wrote:
> Would speed necessarily be a problem?  The most likely use I'd put them 
> to is as some sort of astrographic instrument  -  perhaps mounting a 
> Philips ToUCam in place of the CRT assemblies.   The smaller focal area 
> would reduce the aberrations and I presume I could always add a 
> corrective element into the system.
> 
> Cheers,
> Bevan
> 
> 
> Jarvis Krumbein wrote:
> 
>> Philco made a large screen projection television set which used similar
>> Schmidt optics.  This was black and white and I'm sure predated your
>> projector by many years.  Molded mirror blanks (8") and molded Schmidt
>> correctors were available on the surplus market very cheaply and I had
>> one of the mirror blanks that I used as an ashtray before I quit smoking.
>> I think the bigest problem you will find in using the optical components
>> is that the are very fast and designed for fairly close focal 
>> distances. The abberations will probably be excessive when used at 
>> infinite focus
>> for astronomical purposes.
>>
>> Jarvis Krumbein
>>
>>
>>  
>>
> 

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