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Posts Made By: Maurice Clark

September 18, 2002 03:27 PM Forum: CCD Imaging and Processing/Solar System

Best entry level scope for CCD Imaging??

Posted By Maurice Clark

Hi john,

Almost any telescope will work for CCD imaging. The real decision is what you will want to do and how you intend to do it. for example, Do you have a flip mirror? If not then it can be frustrating trying to centre something on your CCD chip without a GOTO mount.

With a CCD it is important to match the pixel size with the telescope focal length. If you have already made a decision as to which camera to get, then you should look at a telescope to match. for more information on this, go to the apogee website at http://www.ccd.com/index.htm and click on the 'CCD University" link. That is a very useful and informative set of pages.

Regarding mounts, that will depend on what telescope you have. A cat will require a smaller mount that a newt since it is more compact. As a general rule, get a mount that is rated for a size larger than the scope you will be using.

Hope this helps.

Maurice

September 19, 2002 02:45 PM Forum: Deep Sky Observing

Saturn's Moons

Posted By Maurice Clark

Hi Edz,

If you managed to spot Enceladus than Iapatus should also have been visible. It is an interesting moon to hunt down. Quite some distance from Saturn and with a large magnitude variation depending on which side of Saturn it is on.

Keep looking up.

Maurice

September 23, 2002 03:30 PM Forum: Equipment Talk

Looking for telescope parts

Posted By Maurice Clark

Hi Dennis,

There is usually plenty of these items in the "filters, finders, misc" classifieds. You could also check under "Mounts" and "Telescope making".

Failing these (does AstroMart EVER fail!!! :-)) I have had good dealing with Bill Vorce of "Telescope Warehouse"

Cheers,

Maurice

September 23, 2002 03:47 PM Forum: Film Astrophotography - Imaging and Processing

g-11 vs. LX-200 as imaging mount

Posted By Maurice Clark

Hi Paul,

You did not mention your CCD setup, but another thing to consider with a fork mount is if there is enough room for your CCD to fit. I currently use an ST-8 with an 8" LX200 and there is not enough room for the CCD to fit so I cannot image past about +50*. With a GEM you do not have this problem.

Cheers,

Maurice

September 26, 2002 02:56 PM Forum: CCD Imaging and Processing/Solar System

st2k moon mosaic reprocessed....

Posted By Maurice Clark

Hi Andrew.

I am impressed at how well you have managed to eliminate the joins between images. When I tried to compile a similar mosiac I could not get rid of the joins. Too much difference in the light levels between each image.

Any suggestions?

Maurice

September 30, 2002 03:14 PM Forum: Deep Sky Observing

Top 10 galaxies

Posted By Maurice Clark

I realised this morning that I had left out NGC 253. Old age and too much work preparing classes must be rotting the brain cells!!! Trouble is.... where to fit it in! Probably substitute it for NGC 1566.

Back to preparing for class. Venus and the Earth today!

Cheers,

Maurice

October 1, 2002 04:24 PM Forum: CCD Imaging and Processing/Solar System

SBIG ST-6

Posted By Maurice Clark

Hi David,

We use a number of ST-6's here at the college to teach students the basics of CCD imageing. It seems like a good camera, however the chip is a little small so with a 12" LX200 you will have a very small field of view. However the pixels are large and so should match the focal length quite well.

It should make a very good starter camera but I think that you will soon catch the CCD version of aperture fever, a bigger chip and smaller pixels!

I have no idea what they would be selling for these days, but ST-4's and ST-5's seem to be around the $500 - $600 US so I would guess around $800 or so.

Below is a 120 sec image of M51 taken by one of the students a while back. It was taken with an 8" f/6.3 LX200. It might give you some idea of what you can get. No processing apart from dark subtraction was done on the image.

hope this helps.

Maurice

October 2, 2002 02:33 PM Forum: CCD Imaging and Processing/Solar System

CCD 4 Me???

Posted By Maurice Clark

Hi David,

As Andrew has said, to a large extent it depends on your budget. It also depends to some extent on your telescope, particularly the focal length you will be imaging at.

Have a read of the "CCD University" on Apogee's website;
http://www.ccd.com/index.html

This will help you decide what pixel size/chip size you will need/want. Once you have decided that, then look around for a camera you can afford with those characteristics.

Cheers,

Maurice

October 8, 2002 04:12 PM Forum: CCD Imaging and Processing/Solar System

CCD with a Mac?

Posted By Maurice Clark

Hi Michael,

The college where I work uses Macs. (Why I do not know!!!) The astronomy class use ST-6's and we also have an ST-8. These will run on the Macs with an adapter that you can get from SBIG.

I am not sure about the Meade cameras as I have always used mine with a PC. Also I am not sure what 3rd party image processing software is available for the Mac, but I would imagine that many of them are. Just check before you buy.

Regards,

Maurice

October 21, 2002 09:18 PM Forum: Off Topic Discussions

Setting prices for used goods?

Posted By Maurice Clark

Hi Anthony,

Considering the number of variables, it is difficult to come up with a firm guideline, however for my own part, I do not buy anything over about 75% of its new price.

Maurice