Here's the story so far..
Following my recent talk on imaging Jupiter, my friend had purchased a Philips webcam kit, including eyepice adaptor and IR-block filter:
We discussed how the camera is fitted to the telescope:
and how big the image would be on the sensor:You’ll find that the adaptor (and filter) which screw onto the front of the camera have the same 31mm diameter barrel as your eyepieces, so that you can slide it into the telescope draw-tube (in place of the eyepiece).
But it won’t be parfocal with your eyepiece, so you’ll need to re-focus when you put the camera in.
It’s easiest to start off practising with the Moon – it’s a large target and so much easier to keep in the field-of-view, even if you nudge the ‘scope when removing the eyepiece and fitting the camera!
Or you could even try in daylight with a distant terrestrial object (maybe a chimney-pot or TV aerial on a house across the street?)
I recommended the free “CCD” utility from the Astronomical Society of Southern New England as a useful guide to image scale:you’ll be using the telescope optics to form a real image onto the webcam’s sensor – just like a camera does with its telephoto lens. But in comparison with a 35mm camera using a 200mm lens, your telescope has a much longer focal length and the webcam sensor is only 1/3” across, so you’ll still get a reasonably-sized image (once you can get your ‘scope pointed accurately enough).
In order to get my large images of Jupiter I use a 2m focal length ‘scope and a Barlow lens, but this degree of magnification makes it extraordinarily difficult to point accurately enough – hence I need a cross-hair eyepiece with a flip-mirror for aiming!
And as the magnification increases, the image gets dimmer, and you’re even more at the mercy of atmospheric turbulence.
Here’s its output for my Jupiter imaging system: