Samyang 650Z 650-1300mm f/8.0-16.0 Zoom Lens I love for it' sheer ridiculousness* I don't actually have one, most reviews say it's not easy to use, image quality is 'ok at best', it is heavy and too large to put in a standard camera bag
... but I still want one.I first saw one on kijiji that came with a 2X multiplier (just add to the ridiculousness)* and it was $185! so I had to look into them.
They are sold under a few different band names /co-brands but they are basically all the same. new they range from about $250 + shipping up to $550 including shipping.
There are pics out there from this lens and some , aren't that bad. they are about what you would expect. If used carefully they can produce usable images, but I don't think you'll see anything from this lens in National Geographic. I did see a you-tube clip shot with this lens & 2X extender and again it wasn't too bad, definitely usable for what it was. So, i would get one at the right right price to play around with, just not for paid gigs.
P.S. i didn't get the one from kijiji, because it was 5 hours away and shipping wasn't offered as an option.
*probably not real word