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Message: <blockquote data-quote="GYRob" data-source="post: 1217706" data-attributes="member: 38948">i did a little revew in another forum on my thought'sTo me its quite light feel's nice in the hand and easy to swing up onto a bird in flight just did that with this shot OS is slower to startup than IS but that should not be a problem .The zoom ring is tight but it will ease off with use im sure.I think its well made although im sure the felty outer surface will were off with use not that that bothers me at all.its a shame it does not have a limit switch as it does take longer to focus if you lose the bird SO dont lose it  The triopd ring is nice and big enough to hold onto when carrying the len's /camera and on that plate at the back your thum almost fits in the gap between the camera and plate (ITS AT THE BACK OF THE TRIPOD PLATE ) but it feels sharp as the gap is just a little small well it is for my thum .I bought the lens mostly for aircraft and a little birding and im sure it will do the job nicely AF is very fast on my MK3 in fact it suprised me just how quick it was .Iv only shot at 500mm at the moment as this should be were it would not be at it best However it is very good at 500mm f6.3 It does need a fair bit of light ( i like fast SS when hand holding )but if your happly to shoot at 400 iso and above then it will be fine in bright non sunny day'sthe bottom line Im lucky enough to be able to buy most things i want and would not be bothered if i lost money having tried something and not likeing it then selling it on at a loss .Im keeping this lens, i like it and it fills a zoom gap (dont like the 100/400 ) its a nice range has OS fast AF and from my small tests the IQ is very good and must be close to the ef 100/400 .added.I use to have a 170/500 and did not like it at all IQ was not as good as this lens the OS  works just like IS the image settels very nicely its just slower at start up. IS half a second OS 1 second ...just back from field testing the lens. the shot was the best i managed today 1dmk3 - lens at 500mm 1/640 f6.3 iso 200 resting on car roof .the lack of a limit switch showed itself today now and then wile trying BIF  i lost the bird of the focus point and it would go way out of focus and that made it very hard to find the bird again  very hard.i found the best thing to do is point it at the ground aprox distance of the bird and get focus back then try for the bird again not easy to do.Rob.</blockquote>

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