Pleiades Occultation Eyepiece Advice

If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering which
size eyepiece would be better, my 25mm or 40mm? I suspect the latter for
the wider FOV, but I am not sure.

John Nichols wrote:
If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering which
size eyepiece would be better, my 25mm or 40mm? I suspect the latter for
the wider FOV, but I am not sure.




You didn't mention the focal length of the scope, but I think wider
(40mm) would work best.

Phil

If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering which
size eyepiece would be better, my 25mm or 40mm? I suspect the latter for
the wider FOV, but I am not sure.


Yes, probably the 40mm would give a nicer view. But just use/try them both and use the one you enjoy the most.

-Florian

"Phil Wheeler" wrote in message
...
John Nichols wrote:
If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering
which size eyepiece would be better, my 25mm or 40mm? I suspect the
latter for the wider FOV, but I am not sure.


You didn't mention the focal length of the scope, but I think wider (40mm)
would work best.

Phil

F/11, Phil.

"Florian" wrote in message
...
If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering
which
size eyepiece would be better, my 25mm or 40mm? I suspect the latter for
the wider FOV, but I am not sure.


Yes, probably the 40mm would give a nicer view. But just use/try them both
and use the one you enjoy the most.

-Florian

Thankis, Florian

John Nichols wrote:
If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering which
size eyepiece would be better, my 25mm or 40mm? I suspect the latter for
the wider FOV, but I am not sure.

Hi:

The lower the power, the better. A 40mm in 1.25 inch format really
doesn't provide much more field than the 25mm, however, and a 25 is
usually more comfortable to use. Me? Assuming it's clear (a major
assumtion), I'll be watching with a pair of Burgess 15x70 binocs.

Peace,
Rod Mollise
Author of _Choosing and Using a Schmidt Cassegrain Telescope_
and _The Urban Astronomer's Guide_

Like SCTs and MCTs?
Join the SCT User Mailing List.
http://www.groups.yahoo.com/group/sct-user

See my home page at
http://skywatch.brainiac.com/astroland/index.htm
for further info

For Uncle Rod's Astro Blog See:
http://journals.aol.com/rmollise/UncleRodsAstroBlog/

"RMOLLISE" wrote in message
ups.com...

John Nichols wrote:
If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering
which
size eyepiece would be better, my 25mm or 40mm? I suspect the latter for
the wider FOV, but I am not sure.

Hi:

The lower the power, the better. A 40mm in 1.25 inch format really
doesn't provide much more field than the 25mm, however, and a 25 is
usually more comfortable to use. Me? Assuming it's clear (a major
assumtion), I'll be watching with a pair of Burgess 15x70 binocs.

Peace,
Rod Mollise
Author of _Choosing and Using a Schmidt Cassegrain Telescope_
and _The Urban Astronomer's Guide_

Like SCTs and MCTs?
Join the SCT User Mailing List.
http://www.groups.yahoo.com/group/sct-user

See my home page at
http://skywatch.brainiac.com/astroland/index.htm
for further info

For Uncle Rod's Astro Blog See:
http://journals.aol.com/rmollise/UncleRodsAstroBlog/


I've got a pair of Bushnell 16x50 binoculars that I can also use, IF it's
clear. Right now, it doesn't look good.

On Sat, 01 Apr 2006 02:00:04 GMT, "John Nichols"
wrote:

If the weather is clear tomorrow evening I plan to try and watch the Moon
occult the Pleiades. I'll be using a 90mm refractor, and am wondering which
size eyepiece would be better, my 25mm or 40mm? I suspect the latter for
the wider FOV, but I am not sure.


Assuming both eyepieces are Plossls and 1.25" size, the fields of view
of them will be:
1.72 deg. for the 40mm or about 3.4 moons wide and the Pleiades will
fit as well.
1.25 deg. for the 25mm about 3 moons wide and the Pleides will fit
in it as well.
I'd try them both. On deepsky, the 25mm will provide higher contrast
owiing to a darkening of the sky background so it might assist in
keeping the skyglow caused by the Moon more under control than the
40mm with it's 25x would, however, the 40mm will show more sky
so it's a toss up.
-Rich