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Message: <blockquote data-quote="Jaff" data-source="post: 1492460" data-attributes="member: 42340">Sorry Richard, it wasn't a personal jibe against you. My apologies. I was more referring to what you so beautifully described as the 'mud-slinging'. :-OIn truth, yes, if you had read through the Canon threads you'd have found a wealth of answers to what the 400mm prime can produce as well as the other lenses mentioned and avoided all this. Perhaps a sticky thread at the top reminding people to try searching for the info they seek before starting a new thread would be an idea.I'm just tired of the 'which lens is the best' saga, bottom line is whatever telephoto lens you get, so long as it's an L-grade, will produce results that will blow you away. The one point that I read which I think you should take notice of is that the 100-400mm does seem to attract dust. There's all kinds already on the inside of my outermost piece of glass but nothing internally (at least as far as I can tell!) but it hasn't affected the IQ in the slightest.Happy hunting anyway. :t:Adam</blockquote>