Re: Eypiece quality

On Sun, 1 Jan 2006 08:01:11 -0600, "John Banister"
<banister@xxxxxxxxx> wrote:

>+<James, interesting stuff. So what are the eyepiece designs to look for with
>+<a F4.7 scope?
>+<
>+<-John
>+< ----- Original Message -----
>+< From: james
>+< Newsgroups: sci.astro.amateur
>+< With the many fast scopes today these eyepieces are less desirable to
>+< the many 5 to 7 element designs if one is seeking wide field of view
>+< and long eyerelief. In scopes that are F/8 and longer, these will work
>+< well and give good visual viewing.
>+<
>+< james
>+<
******

Each design has its weaknesses and strengths. Each design is better at
viewing different items such as deep space, planetary and even double
stars. With this background I really do not like to favor any brand
over another or even any design in a forum like this because what I
find acceptable for viewing, others will most likely not agree with.
The one basic recomendation I suggest is with planets and splitting
multiple stars. These eyepieces should meet the definition of
orthoscopy. This would include Abbe Orthos as well as others. Field of
View is not as important in planetary work as is with deep space
viewing. More often it is best to go to star parties and view through
scopes similar to yours and with their eyepieces. I wear glasses but
just cannot look through an eyepiece with them on. It does not matter
how much eyerelief there is. Dang bifocals. So my preferences come
with the baggage of my older eyes with some astigmatism in one and
with > +2 diopter in both.

If you are into wide field of view with good eye relief than the
Celestron/Orion Lanthinums will work. Radians will also will achieve
good eye relief. There are others. Much will depend on your budget. If
you don't wear glasses, then Abbe Orthos to any of the many varieties
that Nagler, Pentax, Speer-Waller produce are good to excellent
depending on what you wish to observe.

Having used a 15 inch F/4.5 scope, I found that the 35mm Panoptic is a
very good wide field observing eyepiece. Fills the eye full of stars
when looking into the heart of the Milky Way. The Meade 14 mm Ultra
Wide is good. A 9mm Nagler also is a fine view. These were all used in
conjunction with a photovisual paracorr also. Abbe Orthos work nicely
on planets.


james
.

Relevant Pages

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