Re: [ATM] Ross null test - would this surplus shed lens work?

[Mark Cowan <toolontop@yahoo.com>]

Hi Richard:

Seems a good point - some considerable searching with
no current product from Melles Griot to be found - but
wait, try "#01 LQF 249" and take the first link, the
lens shows up in the "standard" section with no
quality spec...  Their "precision" spec in the same
document is lambda/4 and 40/20 scratch dig.  So the
lens might benefit from some careful touch-up work.  

The material in this case is immaterial. ;)

Best,
Mark

--- Richard <cnc@cncservo.co.uk> wrote:

> Hi Mark,
> 
> Tuesday, September 26, 2006, 6:39:53 AM, you wrote:
> 
> MC> Do what Ric recommends re. the FL - it's a
> little long
> MC> for the size...maybe.  As to the material,
> there's no
> MC> problem with fused silica - just use the proper
> MC> refractive index in the position calculation. 
> And
> MC> post your results, it sounds like that could be
> a
> MC> really nice lens for a Ross Null setup...
> 
> Agreed, but I'd put much more emphasis on
> "precision" than on
> "Fused Silica". If you check the part numbers given
> for several
> of those Precision lenses at the manufacturers web
> site you'll
> see the manufacture does not describe a lot of them
> as
> precision.
> 
> -- 
> 
> Best regards,
>   Richard in the UK
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
ATM mailing list http://www.atmlist.net/