Re: [ATM] stalking the wild achromat - and thoughts on a variable-focus telescope design...

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

dave w wrote:
> "Richard F.L.R. Snashall" wrote:
>
>>    b) Imaging will nominally require a flat field; you will have a
>> hard time making a flat field with a doublet or triplet.
>
> This is where the "Petzval" designs you've been posting - the 
> ones that look like they have an extra set of lenses near the 
> image plane - come in?
>
Yes.
>>    d) If you need it, the GSUM tool is always available, too. 
>> I don't know if someone has put it on a Linux machine yet,
>> although there was supposed to be the promise
>> with Java that it should be platform independent.
>
> Do you have a link to this?
    http://users.rcn.com/rflrs/GeeWyld1_4_2.jar   Java v. 1.4.2 version
    http://users.rcn.com/rflrs/GeeWyld1_5_0.jar   Java v. 1.5.0 version
    http://users.rcn.com/rflrs/GeeWyldUM.htm      some instructions
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