2" 90° Apparent Field Eyepieces Announced

(Jon Isaacs) wrote in message ...
My experience with Burgess has been excellent value for the money. But
I do wonder about the optical characteristics of this eyepiece.

I have a 30 mm Ziess with an 88 d FOV, and there is a 30 mm Lietz with
either an 86 dFOV or an 88 dFOV. These will pop up from time to time
on the various auction houses on the web, and are of known quality
(e.g. excellent) optically.

Here's some more info from Bill Burgess: It's a 7-element design,

**** all ED glass,****

?????

"broadband multicoatings on all air-to-glass surfaces", and
pinpoint stars to the edge down to f/3.5. Availability is at least 60
days out.

I'd have to see this first.

Clear Skies

Chuck Taylor
Do you observe the moon?
Try http://groups.yahoo.com/group/lunar-observing/
And the Lunar Picture of the Day http://www.lpod.org/
************************************

The part about pinpoint stars to the edge of a 90° apparent field 29mm
eyepiece sounds very attractive. Maybe some of our eyepiece design
mavens can tell us why this is either impossible or comes at the price
of field curvature, loss of contrast or some other desirable optical
characteristic. Or not.

Clear skies,
Shneor Sherman

Here's some more info from Bill Burgess: It's a 7-element design,

**** all ED glass,****

?????

"broadband multicoatings on all air-to-glass surfaces", and
pinpoint stars to the edge down to f/3.5. Availability is at least 60
days out.

I'd have to see this first.

Clear Skies

Chuck Taylor
Do you observe the moon?
Try http://groups.yahoo.com/group/lunar-observing/
And the Lunar Picture of the Day http://www.lpod.org/
************************************

The part about pinpoint stars to the edge of a 90° apparent field 29mm
eyepiece sounds very attractive. Maybe some of our eyepiece design
mavens can tell us why this is either impossible or comes at the price
of field curvature, loss of contrast or some other desirable optical
characteristic. Or not.

Clear skies,
Shneor Sherman

Here's some more info from Bill Burgess: It's a 7-element design, all
ED glass

What a load of crap! All ED my foot. If ED glass was ever used in eyepieces
they would have narrow fields with very poor off-axis corrections.

Roland Christen

Here's some more info from Bill Burgess: It's a 7-element design, all
ED glass

What a load of crap! All ED my foot. If ED glass was ever used in eyepieces
they would have narrow fields with very poor off-axis corrections.

Roland Christen

**** all ED glass,****
"broadband multicoatings on all air-to-glass surfaces", and
pinpoint stars to the edge down to f/3.5. Availability is at least 60
days out.

What a bunch of crap. Wow! he must think the amateur community is gullible!

Roland Christen

**** all ED glass,****
"broadband multicoatings on all air-to-glass surfaces", and
pinpoint stars to the edge down to f/3.5. Availability is at least 60
days out.

What a bunch of crap. Wow! he must think the amateur community is gullible!

Roland Christen

(Shneor Sherman) wrote in message . com...
(Jon Isaacs) wrote in message ...
My experience with Burgess has been excellent value for the money. But
I do wonder about the optical characteristics of this eyepiece.

Clear skies,
Shneor Sherman

Probably best to take the wait and see attitude if something isn't currently
yet available. Burgess Optical has been somewhat optimistic in the past about
delivery dates...

Jon

Here's some more info from Bill Burgess: It's a 7-element design, all
ED glass,"broadband multicoatings on all air-to-glass surfaces", and
pinpoint stars to the edge down to f/3.5. Availability is at least 60
days out.

The part about pinpoint stars to the edge of a 90° apparent field 29mm
eyepiece sounds very attractive. Maybe some of our eyepiece design
mavens can tell us why this is either impossible or comes at the price
of field curvature, loss of contrast or some other desirable optical
characteristic. Or not.

So, all you have to wonder about a
-distortion
-lateral colour
Like most widefields.
-Rich

-Rich

(Shneor Sherman) wrote in message . com...
(Jon Isaacs) wrote in message ...
My experience with Burgess has been excellent value for the money. But
I do wonder about the optical characteristics of this eyepiece.

Clear skies,
Shneor Sherman

Probably best to take the wait and see attitude if something isn't currently
yet available. Burgess Optical has been somewhat optimistic in the past about
delivery dates...

Jon

Here's some more info from Bill Burgess: It's a 7-element design, all
ED glass,"broadband multicoatings on all air-to-glass surfaces", and
pinpoint stars to the edge down to f/3.5. Availability is at least 60
days out.

The part about pinpoint stars to the edge of a 90° apparent field 29mm
eyepiece sounds very attractive. Maybe some of our eyepiece design
mavens can tell us why this is either impossible or comes at the price
of field curvature, loss of contrast or some other desirable optical
characteristic. Or not.

So, all you have to wonder about a
-distortion
-lateral colour
Like most widefields.
-Rich

-Rich

"Chris1011" wrote


**** all ED glass,****
"broadband multicoatings on all air-to-glass surfaces", and
pinpoint stars to the edge down to f/3.5. Availability is at least 60
days out.

What a bunch of crap. Wow! he must think the amateur community is
gullible!

Roland Christen

What -- you mean we're not?? Heck, they're probably not available for... 90
days!