tnx for the info.. I managed to get a sigma f:4-5.6 70-300mm off eBay for a
pretty good deal.. so I now have 2 lens... kk

"Fran" wrote in message
...
www.kevinkienlein.com wrote:

I have a canon digital rebel and a Tamron 28-200 f3.8-5.6, I am looking
at
buying a 2x teleconverter on eBay for under $100.



Are any brands better than others, are they bad news or should I just buy
a canon 75-300 for around $300 and not waste my money... ?

You will loose 2 stops of light and it will not autofocus.
You need an f2.8 lens to autofocus with the 2xTC's on the dRebels.

Fran