I got a telescope for Christmas with a camera adaptor. I've not had much chance to play with it yet but was quite impressed with its power the first couple of times I used it. It's a Telstar 900
I assume that this is the focal length of the mirror?
x114
...and this is the mirror diameter?
reflector, and fills the eyepiece with the moon with the 20mm objective. Strangely the moon is even larger when using the shorter focal length 4mm eyepiece, which I haven't quite worked out yet.
The magnification is calculated by dividing the focal length of the mirror by the focal length of the eyepiece, so the 20mm = 45 power and the 4mm = 225 power (assuming the FL is 900mm).
When looking at a group of stars (Seven Sisters) there are many more visible than with the naked eye, even here in light polluted London.
That's because the 114mm mirror is a lot bigger than your 7mm pupil diameter so it collects more light.
Unfortunately when I put the camera adaptor on with the *istD I couldn't see anything - it was far too dark to focus. A bit disappointing.
Did you have an eyepiece in, or a lens on the camera? If so, try it without them...then the telescope acts as a 900mm lens.
I haven't tried the camera with the moon yet, but will do next time it makes an appearance, and it's not raining, or cloudy.
-- Steve �
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