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Originally Posted by Will Olpin
Yep sorry, i meant Aperture ring and it was Nikon so it mite be the one you are on about because it was very cheap and 70-300.
Thanks,
Will 
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http://www.kenrockwell.com/nikon/70300g.htm
I think thats the one..
It mentions being "soft" at 200-300mm when wide-open.. A lot of lenses get that to some degree, when you "stop it down" to a smaller aperture (bigger F number) its just like squinting your eyes- stuff gets sharper.
I think this is the lens my mate has so i'll have a look at it next time he brings it into work..