>>3775264In my area we have an annual protest wich I couldn't legaly get close to.
So I'm about 1-3 km away at the very least at a position about 200-300 m above them.
Obviously I need a ridiculously long focal length to take decent pics of it, but lenses beyond 1000 mm have a tendency of beeing rather expensive.
So I've built a Canon EF to 1,25" adapter to use my DSLR in prime focus on telescopes.
Saves a shitload of money since telescopes are cheap on the used market.
Especialy 700 mm focal length 76 mm aperture Dobsons are dirt cheap, but require modifications to the focuser to be able to focus onto the sensor of a DSLR as well as modifications to reduce the slack.
On a cropsensor that works out at 1120 mm equivalent focal length.
And since the Dobson is inherently free of chomatic abberations and rather sharp (tested mine beyonde 250x magnification), I can run a 2x Barlow lens on top of that and get 2240 mm equivalent.
I use the same trick on a small 350 mm achromatic refractor, that thing is ridiculously sharp at 350 mm f/5.6 (560 mm f/9 equivalent).
And with the 2x Barlow lens on it, I have a 700 mm lens that weights next to nothing and fits into my small photography backpack.
