|
Mark,
That's looking good!
Stop the scope down to about 50mm aperture. Usually the dust cover for the front of the scope has an extra smaller cover about this size - ideal.
The image of the Sun will be approx 1/100 the focal length ie 1000mm fl will give an image of about 10mm. As you realise, this solar image can easily cook plastic and burn paper!
Your fibre bundle looks very much like the one I have from Surplus Shed, mine is 200micron diameter. The fibres are designed for an input f ratio of about f4 and give an out put light cone about f3 ( about 80% of the input), if you use in on a f6 scope, the output will be around f4, bear this in mind when you consider the possible light loss through the camera lenses.
To get a solar spectrum you'll need a slit in the collimator camera body, on the end of the fibre. A couple of blades from a disposable razor blu tacked parallel and very close will do the trick. Set the slit parallel to the grooves on the grating...
|