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Can you actually see it in the images? Superzooms like this do not produce supersharp images, so if you can put up with the inferior quality they produce, why bother when you will hardly be able to tell?
The front glass element is a strange thing, many photographers are fanatical about it being clean & free from scratches etc, but the reality is it doesn't matter, it's the rear one which is important!
Try a little experiment - take a post it note and tear off a pea sized piece and sick it to the front of the lens, see if you can see it in the view finder, keep making it larger until you can, you'll be surprised how large an object you need before you can see it.
Having said that if it is bothering you there is nothing much that you can do to get it out, you should speak to Tamron, this lens isn't all that old and should not have grown fungus in the time since you bought it, you could argue that the spores were already in the lens when you bought it and it has taken a long time for them to grow to the point where the fungus is visible. Tamron should really sort this free of charge, but they also probably have a system of lens servicing like Sigma has.
I'm not a big fan of the superzooms, if youwant this kind of do it all lens, a point and shoot might have been a better choice, why buy a camera body capable of high quality image production and the cripple it with a lens which is not?
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