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Message: <blockquote data-quote="alanrharris53" data-source="post: 1735820" data-attributes="member: 61894">Thanks for the info guys - even if some of it is wandering off my original topic.  I thought here was something called the trade secritions act in the UK! Not sure how you can call it a 150-500 lens if it is only 470.  It makes a difference as I am always having to croppics of small birds so having to take another 7 ot 8 % off compared to the Tamron will make a difference to IQ.</blockquote>