RFI spotting scopes

To: "Peter Shute" <>
Subject: RFI spotting scopes
From: "Dave Torr" <>
Date: Fri, 28 Sep 2007 09:46:20 +1000
I guess an important issue is how you are going to transport it - if
it normally sits in the back of the car and is only carried a few
metres (most of my birding at the Western Treatment Plant) then size
is not an issue and I guess that a large one is probably better all
other factors being equal. But as soon as you have to carry the thing
any distance (and especially if you want to take it on a plane where I
always put my scope in carry on with the tripod in checked) then you
probably appreciate a 60 mm more. I have the large Kowa - with
hindsight I would probably now seriously look at the smaller models.

On 28/09/2007, Peter Shute <> wrote:
> Thanks, that's a very informative answer.  Now one more question for the
> list:
> - What size? This page:
> seems to be saying that 60mm is enough most of the time (last paragraph).
> 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 comments?
> >
> > No, they don't define "optical performance".
> >

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