On 8 Mar 2004 13:00:20 -0800, (Tom Roginski)
wrote:

I want to thank Pete for pointing out this GSO eyepiece. As he
mentioned the original specification statement of 68 degrees is rather
optimistic. My measure of the barrel that serves as a field stop is
47.5 mm. This gives an AFOV of about 65 degrees for a 42 mm eyepiece.
In the current shipment of these eyepieces, GSO has removed the 68
degree label. In their wholesale literature, they quote the eyepiece
as 65 degrees which it is.

The Meade $300 40 mm SuperWide is listed as having an AFOV of 68
degrees. I have seen a published review of this eyepiece that
indicates a field stop of 43 mm. If this estimate of the field stop is
correct, the Meade also has an AFOV of about 65 degees if my math is
correct. In any case, as Pete points out, the GSO should be good value
at the price.

There also is a 30 mm in this series. This one has a 37 mm field stop.
Again if my math is correct, this comes out to about a 70 degree AFOV.

Clear Skies (or at least less snow),

TOM Roginski (owl1)
Hi Tom,

You are certainly welcome and thank you too for adding further
information. Let me say it has always been a pleasure dealing with
you. I wish I had bought the 42mm from you a week later when I saw
your ad! Anyway, am definitely looking forward to the new 30mm 70°
just mentioned it sounds excellent.

Clear skies,

Pete