Quality of Orion Optics Newtonians

Hello,

I plan to buy a 150 mm dia. f/4 Newton from OO. Do you have any
experience with these telescopes?

Thank you for your help.

Cheers

Chris

"Chris" wrote in message
...
Hello,

I plan to buy a 150 mm dia. f/4 Newton from OO. Do you have any
experience with these telescopes?

Thank you for your help.

Cheers

Chris
Many people here will have used or met some of the O.O.UK scopes (you need
the 'UK', to distinguish them from the US operation...). I am assuming you
are talking about the UK operation. If not, then you might as well buy
directly from a UK importer of the Asian scopes. Generally, their optics
are superb. I don't remember them doing a F/4 6" model?. I thought F/5,
was the fastest they did as standard in this aperture. You don't say which
model, or which mount?. these will have as much effect on what the scope
is good for, as the scope itself. At F/4, this is going to be fairly hard
to collimate well, and have very noticeable coma, to the point where some
form of corrector is probably going to be 'essential'. If you post more
details about which model is concerned, somebody may be able to tell you
if thre are known issues with this or not.

Best Wishes

Roger Hamlett wrote:
"Chris" wrote in message
...

Hello,

I plan to buy a 150 mm dia. f/4 Newton from OO. Do you have any
experience with these telescopes?


Many people here will have used or met some of the O.O.UK scopes (you need
the 'UK', to distinguish them from the US operation...). I am assuming you
are talking about the UK operation. If not, then you might as well buy
directly from a UK importer of the Asian scopes. Generally, their optics
are superb. I don't remember them doing a F/4 6" model?. I thought F/5,
was the fastest they did as standard in this aperture. You don't say which
model, or which mount?. these will have as much effect on what the scope
is good for, as the scope itself. At F/4, this is going to be fairly hard
to collimate well, and have very noticeable coma, to the point where some
form of corrector is probably going to be 'essential'. If you post more
details about which model is concerned, somebody may be able to tell you
if thre are known issues with this or not.

Best Wishes


Thank you for your message.

Actually I plan to buy a model made by OO UK under the brand of Teleskop
Service. You can see it at
http://www.teleskop-service.de/Orion...OrionPhoto.htm and it is
called TS Photo Newton 6.

I already have the mount. It is a Vixen GP/DX. I plan to use my Canon
300D digital camera with the scope.

Cheers

"Chris" wrote in message
...


Roger Hamlett wrote:
"Chris" wrote in message
...

Hello,

I plan to buy a 150 mm dia. f/4 Newton from OO. Do you have any
experience with these telescopes?


Many people here will have used or met some of the O.O.UK scopes (you
need the 'UK', to distinguish them from the US operation...). I am
assuming you are talking about the UK operation. If not, then you might
as well buy directly from a UK importer of the Asian scopes. Generally,
their optics are superb. I don't remember them doing a F/4 6" model?. I
thought F/5, was the fastest they did as standard in this aperture. You
don't say which model, or which mount?. these will have as much effect
on what the scope is good for, as the scope itself. At F/4, this is
going to be fairly hard to collimate well, and have very noticeable
coma, to the point where some form of corrector is probably going to be
'essential'. If you post more details about which model is concerned,
somebody may be able to tell you if thre are known issues with this or
not.

Best Wishes
Thank you for your message.

Actually I plan to buy a model made by OO UK under the brand of Teleskop
Service. You can see it at
http://www.teleskop-service.de/Orion...OrionPhoto.htm and it is
called TS Photo Newton 6.

I already have the mount. It is a Vixen GP/DX. I plan to use my Canon
300D digital camera with the scope.

Cheers
If you notice straight away, they are suggesting the coma corrector on the
same page, for the F/4 to F/6 models. You should also get the 2" focusser.
Beyond this, it is down to the optics, and the O.O.UK optics are generally
great, so you should be well under way. Provided you keep to reasonably
short exposures, the GP-DX, is a good mount, but if you push the exposure
times towards the max that you can use with your camera, you will find
guiding may become necessary. also focussing on a DSLR, may be quite
difficult...

Best Wishes

Roger Hamlett wrote:

guiding may become necessary. also focussing on a DSLR, may be quite
difficult...

Yes that is quite true! I already shot a few images with my 300D and
Orion ED80 and I had big problems with focusing. I thought I would find
a freeware on the Web to help me focus the camera but could not find any...

"Chris" wrote in message
...


Roger Hamlett wrote:

guiding may become necessary. also focussing on a DSLR, may be quite
difficult...

Yes that is quite true! I already shot a few images with my 300D and
Orion ED80 and I had big problems with focusing. I thought I would find
a freeware on the Web to help me focus the camera but could not find
any...
I am wondering what sort of software you had in mind?. Unless you have an
electric focusser on the scope, no software package is going to be able to
do much. You best bet, is to probably go for one of the old 'focus aids',
such as a Hartman mask. The freeware focussing packages, generally require
you are using an astronomical imaging package (so you have 'FocusMax' for
Maxim for example).

Best Wishes

Orion Optics UK does not have a 150mm f/4 scope in their catalog. f/5
it's their fastest for that size and I won't reccomend anything faster
for imaging work. Actually, even f/5 is rather fast and the useable
area on a Canon 300D is quite small at f/5. Other than that their
scopes are excellent.

Andrea T.