From: Mark VandeWettering 
To: Thomas Janstrom 
CC: atm 
Reply-To: Mark VandeWettering 


Thomas Janstrom wrote:

>I have just come into a lump og corning optical glass, I want to find out
>some of the numbers for it.
>
>This is the info I do have on the glass.
>
>Glass type: 523-586
>Tank: 137 FA Cord:C (this last bit is a guess as the writing is faded)
>Date: 12/29/60
>Hour: 0000
>
>How would I go about converting this info to some thing usable to the
>designing a system that uses this glass?
>
>TIA.
>
>Clear skies, Thomas
>http://www.tjanstrom.com
>"Don't make me set the laser printer to stun"
>
>
>
The important bits are the glass type listed.   The first three numbers
specify
the refractive index, namely 1.523.  The last three digits specify the Abbe number,
namely 58.6.   When I leafed through the glass catalog in the back of
Rutten &
Venrooij, it seems to be a close match to K5, a relatively inexpensive crown.

You need a flint like F2 (620-364) to pair with this to make an achromat.  The
methodology for designing doublets is pretty straightforward, and can be done with
a simple spreadsheet.

    Mark

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