...I bought a second hand but refurbished EOS 350D from ebay, with warranty and stuff!
I'll do the astrorigging myself, means exchanging the built in IR-blocker with clear glas. Then one of my greatest dreams will come true: taking emission line images from space nebulae without worrying about light pollution!
(explanation: space nebulae emit light at very specific wavelengths - one of them is 656 nm. I have a filter that transmits only this very wavelength, so light pollution is vitrually completely eliminated. Unfortunately the built in IR-blocker of DSLRs also block that 656 nm line, that's why people like me rip out that built-in filter and replace it with clear glas. To use the cam for common photography again, that built-in filter can be "emulated" by using a screw-in filter in front of the lens or a clip-in filter which fits between lens and mirror. Of cause if you take images at a single wavelength, you only get monochrome results. Somday I'll buy other line filters (they are pretty expensive), if you combine the monochrome images every filter takes, you get a scientific and also aesthetical colour composit. The hubble does it that way and that's my goal also.)
Of course those filters only work on gas nebulae. Stars and galaxies emit all wavelengths continuously and therefore no filter will ever exist that blocks 99% light pollution while transmitting 99% of the starlight. Sadly.

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