Good Place to buy lenses

Interesting, I always thought that Saturn's rings are all different
coloured like the NASA photos, I also remember reading a nice
explaination somwhere about different gases and different colour
reflections etc. Can someone point me to a real image taken from a real
backyard telescope.

"tulika" wrote in message
oups.com...
Interesting, I always thought that Saturn's rings are all different
coloured like the NASA photos, I also remember reading a nice
explaination somwhere about different gases and different colour
reflections etc. Can someone point me to a real image taken from a real
backyard telescope.

http://www.rocketroberts.com/astro/scopeview.htm

http://seds.lpl.arizona.edu/nineplan...ts/saturn.html

The first link will show you Saturn as seen in amateur telescopes. Under
ideal seeing, for brief glimpses you will see it better than this, but you
will see no more color than this...

The larger photo is beyond what you will see in amateur scopes, but notice
that there is no real "color" in the heavily saturated color sense, in this
image, either...
--
Jan Owen

To reach me directly, remove the Z, if one appears in my e-mail address...
Latitude: 33.6
Longitude: -112.3

"Jan Owen" wrote in message
news:BV7If.21325$ZA5.16586@fed1read05...

"tulika" wrote in message
oups.com...
Interesting, I always thought that Saturn's rings are all different
coloured like the NASA photos, I also remember reading a nice
explaination somwhere about different gases and different colour
reflections etc. Can someone point me to a real image taken from a real
backyard telescope.

http://www.rocketroberts.com/astro/scopeview.htm

http://seds.lpl.arizona.edu/nineplan...ts/saturn.html

The first link will show you Saturn as seen in amateur telescopes. Under
ideal seeing, for brief glimpses you will see it better than this, but you
will see no more color than this...

The larger photo is beyond what you will see in amateur scopes, but notice
that there is no real "color" in the heavily saturated color sense, in
this image, either...
--
Jan Owen

To reach me directly, remove the Z, if one appears in my e-mail address...
Latitude: 33.6
Longitude: -112.3


Note also, below the large Saturn image at the top of the page in the second
link, there are a couple photos that show a LOT of (bright yellow) color in
the rings, but DO understand that these are not true colors you're seeing
here, and you will NOT see anything like that visually through a
telescope...

What you will see in an amateur scope is better represented in the first set
of representations...

--
Jan Owen

To reach me directly, remove the Z, if one appears in my e-mail address...
Latitude: 33.6
Longitude: -112.3

http://www.rocketroberts.com/astro/scopeview.htm

http://seds.lpl.arizona.edu/nineplan...ts/saturn.html

The first link will show you Saturn as seen in amateur telescopes. Under
ideal seeing, for brief glimpses you will see it better than this, but you
will see no more color than this...

The larger photo is beyond what you will see in amateur scopes, but notice
that there is no real "color" in the heavily saturated color sense, in
this image, either...

Our newts do considerably better than these images in good, but not
exceptional, seeing. We are disappointed if the Cassini Division is not
sharply defined.

Dennis

"tulika" wrote:

Interesting, I always thought that Saturn's rings are all different
coloured like the NASA photos, I also remember reading a nice
explaination somwhere about different gases and different colour
reflections etc. Can someone point me to a real image taken from a real
backyard telescope.

All well and good, but what do *you* see? You are the
observer, and what you see is what matters. There is no
right or wrong, either. We're all different.

In my backyard scopes the rings are white and the globe
of the planet is shades of yellow, with cloud bands. The better
the seeing, the more pronounced the Cassini Division is.

At the moment there are so many stars in the vicinity it's
difficult to tell which are stars and which are moons.

Laura Halliday VE7LDH "Que les nuages soient notre
Grid: CN89mg pied a terre..."
ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte

On 2006-02-13, tulika wrote:
I have a Orion XT6. It came with a 25mm and 10mm lense, I can see
Saturn's rings with this, but I want to see it more clearly, hopefully
some colours in the rings. Is that at all possible with a 6inch
telescope? I guess I need a more powerful lense. Are there any reliable
websites where I can buy say 5mm lense?

The disk of Saturn has a noticeable yellow tint. You can seen slight
differences in tint in the polar and equatorial regions and the rings.

"Dennis Woos" wrote in message
...
http://www.rocketroberts.com/astro/scopeview.htm

http://seds.lpl.arizona.edu/nineplan...ts/saturn.html

The first link will show you Saturn as seen in amateur telescopes. Under
ideal seeing, for brief glimpses you will see it better than this, but
you will see no more color than this...

The larger photo is beyond what you will see in amateur scopes, but
notice that there is no real "color" in the heavily saturated color
sense, in this image, either...

Our newts do considerably better than these images in good, but not
exceptional, seeing. We are disappointed if the Cassini Division is not
sharply defined.

Dennis

I understand.

Living in Arizona, I have much better seeing than most, more frequently than
the majority... I can typically see more detail than represented here in
even my 94 mm APO, almost any time... But lots of others, with more
aperture, in their local seeing conditions cannot...

Certainly the images shown represent a worst case scenario for me, even with
my SMALLEST scope, most of the time...

But the REAL point wasn't about whether YOU (or I) can see Cassini crisply;
it was whether the OP can see all sorts of COLORS in the rings. And, simply
put, the answer is, one can't... There certainly IS detail in the rings,
but color ain't IT...

--
Jan Owen

To reach me directly, remove the Z, if one appears in my e-mail address...
Latitude: 33.6
Longitude: -112.3

Thanks Jan Owen for those images, that whole site is very useful.
It kind of makes sense now, main culprit is just light and air
pollution. I think I will need to get away to a really really dark
place and look. Here I do not at all see any difference between the
colours of disks and planet becasue of all light pollution.

"laura halliday" wrote in message
ups.com...
"tulika" wrote:

Interesting, I always thought that Saturn's rings are all different
coloured like the NASA photos, I also remember reading a nice
explaination somwhere about different gases and different colour
reflections etc. Can someone point me to a real image taken from a real
backyard telescope.

All well and good, but what do *you* see? You are the
observer, and what you see is what matters. There is no
right or wrong, either. We're all different.

In my backyard scopes the rings are white and the globe
of the planet is shades of yellow, with cloud bands. The better
the seeing, the more pronounced the Cassini Division is.

At the moment there are so many stars in the vicinity it's
difficult to tell which are stars and which are moons.

Laura Halliday VE7LDH "Que les nuages soient notre
Grid: CN89mg pied a terre..."
ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte


Well said.

--
Jan Owen

To reach me directly, remove the Z, if one appears in my e-mail address...
Latitude: 33.6
Longitude: -112.3

tulika wrote:

Thanks Jan Owen for those images, that whole site is very useful.
It kind of makes sense now, main culprit is just light and air
pollution.

No, neither light pollution nor air pollution has anything to do with
it.
If anything, air pollution (within reason) makes planetary views
better.

The issue is *seeing* -- atmospheric stability. Do you know how views
of distant objects waver when you view them over a hot parking lot, or
through the exhaust from a furnace? That's bad seeing, in extreme form.
But seeing has to be *really* terrible to affect naked-eye views.

At 120X through a telescope, however, even the most miniscule
thermal instability will degrade an image. That's why the seeing is
often *better* on hazy nights than on crystal-clear nights. When it's
sparklingly clear in a rural area, the ground radiates heat like crazy
to the night sky, and the temperature plummets, causing all sorts
of instability. In a city, however, the air pollution blocks much of
that radiation, the temperature doesn't fall as fast, and the seeing
is better.

Seeing is also generally poor in the northern U.S., where the jet
stream often passes directly overhead, and good in the southern
U.S., where the weather tends to stay stable and boring for long
periods at a time.

With a high-quality, well-collimated telescope of any size or design,
seeing is the limiting factor in how good the planets will look.

Having said that, poor collimation is an even more common source
of bad high-power images. Put another way, good collimation is
absolutely essential for planetary viewing. I've seen a mushy,
whitish view of Jupiter change into a lovely set of blue and brown
whorls and streaks with a 1/8 turn of one collimation screw.

- Tony Flanders