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Message: <blockquote data-quote="NVSteve" data-source="post: 133219" data-attributes="member: 13248">Rick,As you know, I will be trying out the new Tamron at some point against my f4.  I may just end up keeping both.  My only question to you is if you need quick focusing speed.  I can live with or without VR/VC, but I absolutely need quick focusing along with the 2.8.  From what I've read of the other 2.8 options, they aren't the speediest, nor are they sharp edge to edge (if that matters).  One of the biggest reasons Sigma was never a consideration for me is that it has no weather sealing, nor does it have the O-ring on the mount.  It is a tough call.  I know Mansurov posted up a nice comparison between the f4 and f2.8, including bokeh, and there is only a smidge of difference.  In my case, a 2.8 will allow me to shoot at ISO1600 or less instead of 3200 or less.</blockquote>