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Message: <blockquote data-quote="Roy C" data-source="post: 1499778" data-attributes="member: 18798">Yes, I am tempted Terry but reviews seem to vary and you are paying a big premium for the DO technology. Having said that I have seen some very nice shots on BF taken with this lens.I do not think that a 300/2.8 + 2x or 400 DO + 1.4 will be a lot better than the 400/5.6 + 1.4 from an IQ point of view so for me it is just figuring out if IS and a stop of light is worth the big bucks.I am a little concerned about carrying the 300/2.8 for long periods as it is double the weight of my current lens and still as heavy as the 400/5.6 plus tripod and gimbal head.  Weight wise the 400 DO wins it of course.Another option I have been looking at is getting a 1D3 which would give me AF at f8 on the centre point with my current set-up.Then again the more you read the more you come back to the 500/4 8-PI have had the cash burning a hole in my pocket for some time now but just cannot decide and it is driving me nuts :-O</blockquote>