Think what you will about the Lumix camera (and others like it), but in the end it gets the job done. Isn't that the whole point?
Getting the job done is the point. That said, it would help if the OP had indicated what 'the job' is...a 'sporting event' is not very descriptive.
Yup, I did add another post with more details--it's the CrossFit games, so mostly not
super fast moving, at least from a sports perspective, and it will be outdoors in California. Given this scenario, should I be taking a look at the Lumix?
Okay, I'm having a really difficult time getting past the whole concept here.
The OP is planning to go to one sporting event, and wants to buy a lens based on the length of its barrel, without any consideration as to what other lenses he already owns or would like to own and what he ordinarily shoots.
I'm guess I'm not quite sure why this is a difficult concept. Sure, I could list out all the lenses that I own, what I like and dislike about them, what other things I take pictures of and under what conditions, but I think that's pretty extraneous to the discussion other than that I don't have one that is going to accomplish what I'm looking for.So far the list seems pretty darn short: the 55-250, the 135/2.0 and a 500mm mirror lens.
Obviously I will evaluate these as to how well they fit in with my style and existing equipment, but to ask someone else to make sense of that for a simple "short telephoto lens" question seems excessive.
If you really care, I shoot primarily sports and some portraiture, and only have one lens that I love--the 70-200mm f/2.8 IS Mark I. I don't care for the 24-105L, and also have but am unimpressed with the 85 1.8, the 50 1.8, the 100 2.8 macro, the Tamron 17-55 2.8. I shoot almost exclusively with natural lighting and prioritize a narrow depth of field and good contrast over pure sharpness. But nd as far as sharpness goes, the center is all I care about, as I don't do anything that requires corner sharpness. But I don't see how this info would change the recommendations people have provided above.
Sorry if this comes across snotty--I'm kinda in a grumpy mood this morning.