If I need to be those things just to post an opinion on these forums, then I'll just piss off and leave you to it.
I'm simply asking you to substantiate *why* your opinion differs from mine. I've given my background so that anyone reading the thread (but especially the OP) can see what I've used to come to the conclusions I have.
Because my conclusions differ from yours, I'm asking for you to explain what makes you reach your conclusions. Granted you don't have to say why- but I've found many, many people passing off opinions with no actual experience as the fruits of knowledge rather than guesses- if you can't substantiate your opinion, or prefer not to, then that's fine, but it doesn't help the OP to spend $1000 (~$1720 NZ dollars) on a lens that doesn't make sense for what they want to shoot, or isn't as good as another choice.
I can make a recommendation on these forums when and how I like.
So can I, yet you seem to think I'm not to be awarded the same right.
I don't need to qualify it to you nor anyone else.
It seems rather fruitless to offer advice to someone without being able to substantiate that advice, but that's obviously your right.
It is there, and the OP can take it or leave it. If you have something better to say, say it.
I have said it- then because there's conflicting advice, I substantiated why I think my advice is pertinent. The OP can't weigh if it's better or not if they can't evaluate the information's validity for their intended usage- so your lack of substantiation does them a disservice in my opinion. You obviously have a different opinion, which you are of course welcome to.
Please, for the sake of everyone here, stop being a bully. You just come across as someone who desperately wants to be recognised and respected for his achievements.
Sorry to disappoint you, but you're not good at reading me. I'm already quite recognized and respected for my achievements in multiple fields[1]. My customers are the only recognition I need for my photography.
You ARE respected here, so stop trying to impress everyone.
I'm not trying to impress anyone, I'm trying to ascertain if your advice to the OP that's contrary to mine is due to actual experience or simply posing. I apologize for hurting your feelings by asking direct questions, but I am still most interested in any answers you'd be willing to provide.
I looked through some of my archives from when I shot with zooms, and after I started shooting with the beast. I came up with more TC usage than zooming out. I went back to what I knew of the last person to whom I personally recommended the 100-400 and their experiences, and again found all the wildlife usage at full extension. In other words, I put actual effort into answering the OP's question and it happens to be in a field I practice a *lot* in. I'm asking for substantiation to resolve the differences between our advice.
You proclaimed the flexibility to zoom out[2] was more important than IQ- I'd like to know under which circumstances you found this to be true. Why you'd not share this information puzzles me, but it's your right not to
Seriously, because if you *do* have that experience then the OP (and anyone else reading the thread with the same question) is well-served by comparing their intended usage to yours and mine to decide which lens is the better choice for them to likely spend more than 3x the money they've ever spent on a lens before.
For what it's worth, the 450D doesn't have weather sealing, so the OP wouldn't be all that well-served if the lens were.
Wishing you all the best for the New Year.
All the best to you as well.
[1] Including actually helping to win the Cold War, which while not as impressive as winning both world wars is good enough for me
[2] I'm not being facetious with the "out" comment, focus should always be done at maximum zoom first.
PS: I've never been to NZ, I don't know what wildlife shooting conditions are like there but I'd like to know so that if I do travel there I'll have the right lenses. It'd suck to haul a 400/2.8 all that way if I should have rented a 200-400.