My first telescope, image supposed to be inverted?

D Perkins wrote in :

I bought my parents a 900mm reflector telescope (Bushnell) and we can't
figure out what we're doing wrong. Everything is upside-down, is this a
malfunction or is it supposed to be like that?

It's normal for an astronomical Telescope.

L.



Respond by sending mailto
Thanks in advance,

Doug

I bought my parents a 900mm reflector telescope (Bushnell) and we can't
figure out what we're doing wrong. Everything is upside-down, is this a
malfunction or is it supposed to be like that?

You mounted the scope upside down or it's a chinese model.

Capt RB

"D Perkins" ha scritto nel messaggio
...
I bought my parents a 900mm reflector telescope (Bushnell) and we can't
figure out what we're doing wrong. Everything is upside-down, is this a
malfunction or is it supposed to be like that?

Respond by sending mailto
Thanks in advance,

Doug


It should be right ... you could reverse the image using a 45° prism, I
think.

In article , says...

It's normal for an astronomical telescope.

I bought my parents a 900mm reflector telescope (Bushnell) and we can't
figure out what we're doing wrong. Everything is upside-down, is this a
malfunction or is it supposed to be like that?

Respond by sending mailto
Thanks in advance,

Doug

In message , Bobsprit
writes

nothing

plonk.
--
"Roads in space for rockets to travel....four-dimensional roads, curving with
relativity"
Mail to jsilverlight AT merseia.fsnet.co.uk is welcome.
Or visit Jonathan's Space Site http://www.merseia.fsnet.co.uk

My question was answered thoroughly in email, and in the newsgroup.
Much thanks to all who assisted.

Doug

D Perkins wrote:
I bought my parents a 900mm reflector telescope (Bushnell) and we can't
figure out what we're doing wrong. Everything is upside-down, is this a
malfunction or is it supposed to be like that?

Respond by sending mailto
Thanks in advance,

Doug

I've read that Newtonian Reflector telescopes cannot be corrected to an
upright image. However, Refractor scopes can use a prisim to make the
correction.

I bought my parents a 900mm reflector telescope (Bushnell) and we can't
figure out what we're doing wrong. Everything is upside-down, is this a
malfunction or is it supposed to be like that?

Darrell wrote:

I've read that Newtonian Reflector telescopes cannot be corrected to an
upright image. However, Refractor scopes can use a prisim to make the
correction.

I don't believe there's any theoretical consideration that would
prevent a Newt from being modified to produce a 'correct' image. But
a principal advantage of the Newtonian design is the minimal amount
of glass in the optical path, so adding prisms or extra lenses would
be contrary to its 'spirit'.

--
Odysseus

I'm sure there is a way to fix it, I personally don't know how. The reason
I said, "I read" is because, I never say something "Can't be done!"
However, this is what I found on celestron's FAQ page:
http://www.celestron.com/support/faq_114gt.htm#114A1

Q: How do I get an erect image in my eyepiece?

A: Unfortunately, the inverted image cannot be corrected on Newtonian
style telescopes. These were designed for astronomical use, where an
inverted image is not an issue. Only refractor style scopes can be corrected
for terrestrial use. Binoculars and spotting scopes are simply small
refractor telescopes that have erecting prisms built-in.

"Odysseus" wrote in message
...
Darrell wrote:

I've read that Newtonian Reflector telescopes cannot be corrected to an
upright image. However, Refractor scopes can use a prisim to make the
correction.

I don't believe there's any theoretical consideration that would
prevent a Newt from being modified to produce a 'correct' image. But
a principal advantage of the Newtonian design is the minimal amount
of glass in the optical path, so adding prisms or extra lenses would
be contrary to its 'spirit'.

--
Odysseus

I'd guess that the problem is that most Newtonian reflectors have a
short focal length (low f/ratio) so there isn't room to insert an
erecting prism and keep the image in focus. You might be able to do it
with a Barlow lens and if you're really ambitious you could set some
sort of relay system that extends the light path.
A third, much less elegant method would be to use a TV camera instead of
your eye and put it in upside down.
Personally, I can live with an inverted image.

In message , Darrell
writes
I'm sure there is a way to fix it, I personally don't know how. The reason
I said, "I read" is because, I never say something "Can't be done!"
However, this is what I found on celestron's FAQ page:
http://www.celestron.com/support/faq_114gt.htm#114A1

Q: How do I get an erect image in my eyepiece?

A: Unfortunately, the inverted image cannot be corrected on Newtonian
style telescopes. These were designed for astronomical use, where an
inverted image is not an issue. Only refractor style scopes can be corrected
for terrestrial use. Binoculars and spotting scopes are simply small
refractor telescopes that have erecting prisms built-in.

"Odysseus" wrote in message
...
Darrell wrote:

I've read that Newtonian Reflector telescopes cannot be corrected to an
upright image. However, Refractor scopes can use a prisim to make the
correction.

I don't believe there's any theoretical consideration that would
prevent a Newt from being modified to produce a 'correct' image. But
a principal advantage of the Newtonian design is the minimal amount
of glass in the optical path, so adding prisms or extra lenses would
be contrary to its 'spirit'.

--
"Forty millions of miles it was from us, more than forty millions of miles of
void"