RFI spotting scopes

To: "Alistair McKeough" <>
Subject: RFI spotting scopes
From: "Peter Shute" <>
Date: Fri, 28 Sep 2007 09:35:30 +1000
Thanks, that's a very informative answer.  Now one more question for the
- What size? This page:
seems to be saying that 60mm is enough most of the time (last

Peter Shute

        -----Original Message-----
From: Alistair McKeough 
        Sent: Thursday, 27 September 2007 3:54 PM
        To: Peter Shute
        Cc: Ricki Coughlan; Dave Torr; 
        Subject: Re: [Birding-Aus] RFI spotting scopes
        $500 or $1000 probably makes a difference in being able to make
the ID.
        $1500 or $3000 probably just means a better view.
        On 27/09/2007, Peter Shute <> wrote:

                There are some interesting pages about scopes on the
Olivon website. At:
                they say:
                "From $200 to $2000, each time you double the retail
price of a spotting
                scope you can expect about a 10-15% improvement in
optical performance."
                That would be US dollars, I guess. Applying that
formula, a $400 scope
                would be 15% better than a $200 scope, $800 would be 32%
better, and
                $1600 would be 52% better.
                A lot of money for only a 52% improvement.  Any
                No, they don't define "optical performance".

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