View Full Version : Why my telescope is a CTS

2003-Jun-27, 07:37 PM
It may be sad, but it's great fun spotting CTS (Christmas Trash Scope) evidence in telescopes. I've now turned my eye on my own CTS that I've had for a couple of years.

Tasco Galaxsee 375X
As you can see, it's a Tasco telescope.
It's advertised in terms of magnification.
It's 4'' which means that its maximum practical magnification is only 225X.
It came with, surprise, H20mm and SR4mm eyepieces, but at least they're 1.25''.
It's mounted on an EQ-1 mount, when according to BAG, anything below an EQ-3 is too flimsy for a 4''. So it's two levels too light.
It came with an all plastic 3X Barlow lens.
The finder is all plastic and stopped down, probably a 5X24 stopped down to 10mm as mentioned in BAG.

Charlie in Dayton
2003-Jun-27, 09:58 PM
...as mentioned in BAG...


2003-Jun-27, 10:06 PM

The Backyard Astronomer's Guide.

2003-Jul-18, 11:45 PM
Another thing I've just thought of: the focal length is 500mm, which makes the focal ratio f4.3, far too fast to be of any decent quality.

2003-Jul-18, 11:54 PM
A lot of telescopes are supplied with EQ-1 mounts, CTS or not. I'd suggest that, unless you're planning to do astrophotography, buy a good alt-az mount instead. They're cheaper and lighter.

2003-Jul-19, 12:06 AM
I've seen a 60mm (2.5 inch) telescope advertrised with 540x magnification!