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Message: <blockquote data-quote="mike_gss" data-source="post: 3289041" data-attributes="member: 130756">Can I ask what might be a daft question?I'm re-entering "enthusiast hobby" photography after a long gap during which I was just a "snapper" really. I was given the entry-level Canon 100D as a present 9 months ago and I don't feel I can in all decency to the donor just upgrade it at this time. On the principle of "glass first" I bought the 24-105 L zoom as my "walkaround" lens (which I love) and have been keeping an eye on the second-hand market for 100-400 Mk1's (c.£700 at MBP) but the reviews for the Mk2 seem so good that I'm tempted to go for it. My budget is "fair" but certainly not unlimited (I wish!). I could just about manage the Mk2 at HDEW's price (£1499 when I last looked).My question (sorry it's taken me this long to get to it <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /> ) is will the Mk2 actually work OK on my 100D? I accept that the AF will be a little slow (although my 24-105 L is quite quick) and that it probably won't work with a converter but hopefully that'll come after the eventual body upgrade.Thanks!Mike</blockquote>