Wanted some opinions regarding bridge cameras with super-zoom, I already have a DSLR but as I do a lot of cycling & hill walking I wanted a super-zoom that is light & compact enough to fit in my backpack along with my other gear. I wanted a camera that would give me decent photo's of aircraft flying overhead both on approach to my local airport but also of aircraft that are contrailing much further above, I also have an interest in taking pictures of astronomy as well.
I have narrowed it down to a few cameras but have not ruled out others if they are recommended, they are
Canon SX50 50 x optical zoom
Nikon P510 42 x optical zoom
Panasonic FZ200 only 24 x zoom (but has a F2.8 lens)
Also has anybody had any experience using a teleconverter with any of these cameras, would it be a worthwhile addition?