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Message: <blockquote data-quote="Geoffc" data-source="post: 303921" data-attributes="member: 8705">[MENTION=20480]Cee Fish[/MENTION], IQ wise I understand the the f4 and f2.8 are on a par however that stop means a few things to me, albeit I don't claim I thought about it when I purchased it. It means the autofocus will work better in low light as faster lenses always do on a like for like basis. I don't know how the F4 performs in this respect but the AF on the 2.8 is often quoted as the benchmark to aim at.When I put my 2x teleconvertor on I can still shoot at f5.6 and this lens is very good wide open. In fact shoot it at F4 and it's really starting to sing. I don't know how it the F4 version performs wide open by comparison. The other thing for me is that I can shoot wildlife at 1/1000 sec at f2.8 and ISO 1600 on my D7100. With the f4 I'm either at 1/500 sec or ISO 3200. The last point is a big one for me, especially in dull and miserable UK.For people shots the DOF at 2.8 is a thing of beauty, although for what I use it for this is more of a bonus than a major cost justification.I'm not suggesting that the F4 is a bad option as it has great IQ, it's much lighter and it's easier on the wallet, I just think it's worth discounting the points above first.Sent from my iPad using Tapatalk HD</blockquote>