Originally posted by ftpaddict Specs say max aperture is f/8 f/16 (w/supplied teleconverter)
It's a 650-1300mm F8-16, so with the teleconverter you'd end up having a 2600mm F32 lens. You can't except much for a lens like this, especially considering that it isn't even a prime. Unless you have an extremely sturdy tripod and plan on shooting in bright daylight only, it's a complete waste of money. The tiny aperture would also prevent you from using it for any type of action photography, like sports or birding. My advice: stay away from it!
I don't see why anyone would want to go beyond a focal length of about 1200mm, if not less, because the image quality just goes down the drain and the slightest movement of your tripod (i.e. that caused by wind) would blur your photos.
Since it looks like you're looking for a tele lens, I'd suggest getting a K, M or A 300 or 400mm lens from Pentax, or a bigma, and popping a TC on- the image quality would be better and the effective focal length would still be more than adequate. Another alternative, though in a slightly higher price range, would be the K 500mm F4.5. It provides great magnification and sharpness, but unfortunately suffers from a lot of CA/PF.
Here's a photo I took with it at 700mm (using the L 1.4x converter):
(original)
(100%)
That's what I would call a good investment!
Adam
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