t4i and 1.4 extender

[conropl]

A bare 100-400L is a great lens. It is versatile, and has IS. It is not going to be great in low light, but you are going to pay much much much more for that privilege. I was faced with the same choice as you a few years back, and I chose the 100-400L over the 400mm. I have not regretted it. The IQ is great if used correctly. Here are a few examples with a 7D (same sensor as yours)... if you want to see a larger size, then click on the picture or title and you can see larger sizes in flickr:


Green Heron-7893 by westmichigan, on Flickr


Duckling-3911 by westmichigan, on Flickr


Twin Fawns -1000 by westmichigan, on Flickr


Deer Along the River-9866 by westmichigan, on Flickr

[clemmb]

A bare 100-400L is a great lens. It is versatile, and has IS. It is not going to be great in low light,

That was my thinking for the price. f5.6 is a bit limiting in low light but the price is right.
Canon EF 400mm f/5.6 L USM with no IS, Canon EF 300mm f/4 L IS USM+ 1.4x = 420 with IS or
the Canon EF 100-400mm f/4.5-5.6 L IS USM.
With the zoom you get 400 with IS and no TC for the best IQ @400 IMO

[sedwards]

Thanks again for all the replies guys. Im pretty happy that i posted this and you guys showed pics of what the 100-400 can do on a crop sensor. Like i said my first plan was to get the zoom lens but when i read a few reviews they were all saying the prime was way better. A zoom will be much more versatile for me so thats the way im gonna go. Thanks to all that answered you have helped a lot !
Happy New Year every one.