Meanwhile I got my second Raspi camera, and even managed to remove the lens without destroying the sensor.
So what next? As I wrote before I wanted to try to bring one of the world's cheapest computers (Raspberry Pi model A) together with one of the cheapest, (yet usable) reflector telescopes, the Celestron FirstScope 76.
And it looks like it could work! I made some daylight focusing tests this evening and yes, the Celestron FirstScope has enough back focus so that the sensor w/o the lens gets into the focus plane w/o having to modify the telescope. The field of view must be about half a degree, so the full moon or sun should about fill the view.
My overall setup is the following:
- Raspi model A with camera board,
- WiFI dongle "Edimax"
- Wifi is set up to work as a hotspot (!)
- Lighthttp running as a web server on the Raspi
So "in the field" you can use an iPad etc to connect to the WIFi hotspot run by the Raspi, use SSH to log into a shell on the Raspi, and start taking pictures or videos which can be stored in a directory that is served by the web server on the Raspi. So you can preview and retrieve the images via a web browser on (say) your tablet PC.
So far so good.
The Firstscope doesn't have a clock drive
so with this tiny FOV, celestial objects will move thru the field pretty fast and adjusting manually will be a pain. A bitter application might be bird photography, e.g. long term observing a nest from a huge distance. I doubt you can find comparable optics that will give you this kind of focal length and aperture.