Hi Mirko,
I've only coming to grips with the camera at the moment for terrestrial use as I only purchased it late last year. My astrophotography use is very very limited!
I forgot to mention there is astrograph units available as well, f3.6 from memory, 6 elements in 5 groups but $$$
Bigjoe is right any further mag and you'll soon run out of light unless your looking at the moon.
Cheers
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