Negative Positive
Title: not a good filter
Review: I bought this last year for $13.65 (omg! it's $7.50 now! urgh!) with my Tamron 28-75mm.I used this lens to take portraits and I notice the images are not sharp at all when I zoomed in.I later switched to my Canon 70-200mm (I know it's different quality compare to the Tamron) with the B+W filter, and it was super sharp.Even if the shutter was fast and the light was even, 9 out of 10 images still came out blurry. It bugged me so much to do a comparison test with and without the filter.without the filter, my images were so much sharper.As long as you don't zoom in, it's fine.So, you really get what you paid for. IF you want to protect your lens and not really care about sharpness, go ahead to get this thingy. But, if you care about the sharpness of your photo, stay away. Might as well donate the $7.50 to SPCA or whatever charity you support.
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