75-300mm Kit Lens With TC ?

I've read the TC Sticky and did a search but didn't find any info. on the 75-300
being compatable with any TC's. I see an e-bay store offers this lens in kit form with a Bower 2x TC. Anyone tried this or any other TC.

Autofocus craps out at f5.6. Adding a 2x TC would make you lose 2 stops, so your lens would be a F11. That means absolutely no autofocus. So you can use it as a mediocre, dark, 600mm manual focus lens, but it will not be good.

the 75-300 (and all the other 7x-300's for that matter) are f/4-5.6's. If you add a 2x TC to that lens it becomes a 150-600 f/8-11. The problem is that all but the 1D series of bodies can only AutoFocus with a lens that is f/5.6 or faster (the 1D's can still autofocus an f/8 lens). So, by adding the TC you will lose AF capabilities of the lens. If you can and want to manually focus the lens will still "work".

But the lens isn't sharp to begin with and the 2x TC diminishes Image Quality even further. The Bower 2x is particularly cheap (I know, cuz I have one), and the IQ really takes a beating.

Bottom line, you can try it, but it aint worth it.

Wow, sounds like you'll get about the same IQ as you would w/ a 5 year-old w/ a crayon!

Thanks Guys, That's about what I was expecting.I'm planing on buying a much better tele. and TC down the road so I'll try the Cheap method later.Might be a good bang around lens for the boat on sunny days!