I am looking for a lense with a little range and was wondering which lense is better, the 70-200 F/4L or the 70-300 f/4-5.6? I know you can get a 1.4x extender for the 70-200 to increase its range, but is it worth the extra cost? Which has better image quality? Do any of you have examples of pics taken with either of these lenses? Thank you for your replies.