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d_w
newbie


Reged: 06/18/07

Loc: Luhansk, Ukraine
How to calculate lens radii by degree? new
      #5633528 - 01/20/13 04:41 PM Attachment (14 downloads)

I have read in one article strange description of the lens:

Thikness: 5mm
Diameter: 75mm
Radius: -389°; 125°


This is not misprint, in other source were written "Radius: -389 degree; 125 degree"

How to calculate lens radii by degree?

I tried to measure radii in Solidworks by drawing (first lens in doublet), it samething about -340mm and 60mm.

Edited by d_w (01/20/13 04:43 PM)


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Mike I. Jones
Post Laureate
*****

Reged: 07/02/06

Loc: Fort Worth TX
Re: How to calculate lens radii by degree? [Re: d_w]
      #5634051 - 01/20/13 10:29 PM

It doesn't follow any prescription convention, or even make sense. Can you post a link to the article? It looks like either a typo, or a mistake in character translation from one document format to another.
Mike


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Thomas Karpf
Carpal Tunnel


Reged: 02/09/09

Loc: Newington, CT
Re: How to calculate lens radii by degree? new [Re: Mike I. Jones]
      #5636801 - 01/22/13 12:31 PM

Based on the shape of those curves, that is probably 389mm and 125mm.

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