Thanks for the info and pictures, I'll go for the bigger filter then.
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I would return it. +14 AFMA is little too much for my taste.What do you mean by your taste? If it gives correct results that's good, right?
I think it's great. If you want more, you'll have to go for the Canon II.
My Tamron 24-70 has to go to the Tamron Service the second time because I can't AFMA it enough on my 7D (frontfocus @24mm, backfocus @70mm).
Technically, all extra glass effects the image quality. However, most of the times the benefit of a filter for protection out ways the better IQ.
I usually carry a box for my filters to I can remove them in special situations like low light, high detail landscape, that sort of stuff. Around children the filter stays on, as I like to get close to children, and they always end up touching my precious glass.
I am now considering when do I get the Tamron, I have the money for it now, and I definitely want it for when I go on holiday to Italy in May, then there is a wedding I am shooting a few months later. In the UK the cheapest I see it at is around £800, should I wait and see if the price drops in the next few months?
if you are happy with refurbished wex quite often have them and they go for a bit over £600
Thank you all again for your commentsYou are welcome ... I suggest, you check out this review by Dustin Abbot (one of the CR members)
GMCPhotographics and Rienzphotoz, because of your comments I am still strongly considering the Tamron 24-70. So thank you!
You may also want to check this thread started by Dustin
All the best for your decision and shopping.