B
ben b
Guest
How does a lense affect what u see. iv got a astromaster 130 EQ And only the lenses that came with it. how do u see other things like nebulas and galaxies
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B
beachbum
Guest
A lens, or 'eyepiece' is also called an 'ocular', since the big lens at the front of the telescope is also a 'lens', usually called the 'objective' or the 'objective lens'. An eyepiece simply magnifies the image formed by the objective lens.
The shorter the focal length of the eyepiece, the more it magnifies.
So, you could put a really short focal length eyepiece in there and get lots of magnifying, right? Wrong. Problem is, EVERYTHING gets magnified, including the vibrations and and imperfections in the objective, etc. So, there is a limit to how much you can magnify, usually 50 to 60 times the diameter of the objective in inches is about the limit....so if you have an objective of 130mm (I assume your astromaster has a 130mm objective) which is about 5 inches, and 50 times 5 is about 250, so your maximum magnifying is about 250x.
I don't know what your objective f.l. is , so I can't know what fl eyepiece would give 250x, but that's the shortest f.l. eyepiece you should use.
250x is plenty of magnification to see lots of stuff, however.
The shorter the focal length of the eyepiece, the more it magnifies.
So, you could put a really short focal length eyepiece in there and get lots of magnifying, right? Wrong. Problem is, EVERYTHING gets magnified, including the vibrations and and imperfections in the objective, etc. So, there is a limit to how much you can magnify, usually 50 to 60 times the diameter of the objective in inches is about the limit....so if you have an objective of 130mm (I assume your astromaster has a 130mm objective) which is about 5 inches, and 50 times 5 is about 250, so your maximum magnifying is about 250x.
I don't know what your objective f.l. is , so I can't know what fl eyepiece would give 250x, but that's the shortest f.l. eyepiece you should use.
250x is plenty of magnification to see lots of stuff, however.
C
ConfuciousMouse
Guest
You should be able to see whole lot of things with that rig.
The common conception out there is that to see good
stuff like nebulae and galaxies you need lots of
magnification. Not true. You need good clear nights,
and you need lots of patience.
The Andromeda galaxy can be seen with the naked
eye, and is actually wider than the full moon. It's just
a little dim- and that means that the larger the objective
lens (at the front of the scope) is, the more light you
can gather into the telescope and the brighter the
image will appear.......but if you use more than 30x
or 40x magnification, you'll only be looking at a part
of the galaxy.
Most of the good nebulae and galaxies will be best
seen at between 30x and 60x mag. The Orion
nebula, the beehive cluster, the M-series objects,
all of these are actually easily observable with a
relatively simple scope- like yours.
Good luck. If I were you, I would join a local astronomy
club, or hang around someone who has experience
with finding stuff up there.
The common conception out there is that to see good
stuff like nebulae and galaxies you need lots of
magnification. Not true. You need good clear nights,
and you need lots of patience.
The Andromeda galaxy can be seen with the naked
eye, and is actually wider than the full moon. It's just
a little dim- and that means that the larger the objective
lens (at the front of the scope) is, the more light you
can gather into the telescope and the brighter the
image will appear.......but if you use more than 30x
or 40x magnification, you'll only be looking at a part
of the galaxy.
Most of the good nebulae and galaxies will be best
seen at between 30x and 60x mag. The Orion
nebula, the beehive cluster, the M-series objects,
all of these are actually easily observable with a
relatively simple scope- like yours.
Good luck. If I were you, I would join a local astronomy
club, or hang around someone who has experience
with finding stuff up there.