From: "Thomas" 
To: "Jeff Anderson-Lee" 
Cc: "atm" 
Reply-To: "Thomas" 


Could you be bit more specific? I'm building a pair of 8"DK based
binos, just about have the first half done so I wouldn't mind knowing what
tollerances I'm working to for the second OTA.

Thanks.

Clear skies, Thomas.
www.tjanstrom.com

----- Original Message -----
From: "Jeff Anderson-Lee" 
To: "Eric Royer" ; "J-Engineering"
; 
Sent: Wednesday, June 11, 2003 6:02 AM Subject: Re: ATM Parabolizing for Binos


>
> > I didn't bother with that when making my 6" f/8 binos. I am confident
that
> > the small change in focal length that can happen during polishing will
go
> > unnoticed in the bino.
> > I don't have more data on this subject than my own experience. So I'd
like
> > to know the opinion of other bino makers on this subject.
>
> I've heard that a 2% relative difference in focal length is acceptable.
>
> Jeff
>
>

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