My wife recently bought me a Tamron F-series 1.4X TC. A couple days ago I heard an approaching airliner flying at about 25,000 feet. I had to quickly swap lenses and add the TC. By this time the plane was past the optimum point but what the heck I shot it anyway.
I used center point auto focus and it was hand held.
TV 1/500
AV f/5.6
I'm happy with it so far and a darn sight cheaper than Canon.
Oh yeah, this is a 100% center crop with one straightening pass with Picasa2.



