Welcome Laurent
AP means astrophotography. Wallet will need to be very well lined to head in that direction.
Agree with Jan and JJJ a dobsonian is usually the best way to go for starting in observing. An 8" dob will set you back around $5-600 and will give years of viewing pleasure.
The critical thing in observing is aperture, the bigger the better. Having said that the costs rise substantially once you get beyond a 12" dob, and the 8" is smalll enough to be handled by anyone, easy to transport and setup and very tolerant of collimation. It really is the sweet spot for newbies IMHO.
Malcolm
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