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Re: [ATM] .707*Radius

Also, if you turn off the refocus optimization, PLOP will tell you to 
place three points at near 0.7R, to let's not bash on Hindle too hard.

Jeff Anderson-Lee

Arjan te Marvelde wrote:

>>Richard Schwartz wrote:
>>
>>    
>>
>>>>.....  Essentially half the mirrors weight falls either side of this
>>>>also, so in the past this was a popular place to support the mirror
>>>>within its cell.
>>>>        
>>>>
>>>
>>>This is true only if the mirror thickness does not change with the
>>>radius.
>>>
>>>
>>>      
>>>
>>Agreed!!!  But this never stopped the old telescope making books from
>>using it as the location point for supports.
>>    
>>
>
>The reason is obvious: the relative thickness change for 1:6 ratio mirrors
>is close to 0.
>  
>

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