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I recently got a used Tamron 28-75 off ebay, it focuses fine at 28mm, but the further I zoom in the more it misses by. And by 75mm it is back focusing by a huge amount, more than my Nikon D610 can even fine tune (+20 lens correct AND +20 default correct still misses focus). Of course on live view it focuses fine but I can't always use that 
Does anyone know what could be causing this? I've seen it on lenses that had a loose front element but can't notice anything loose or unstraight on this one.
And does anyone know if it is fixable?
I dont think having a professional repair it would be affordable as I only paid €120 for the lens, but I've taken apart primes in the past to repair successfully so might be willing to give this a go. If anyone knows of any guides to disassmbling this, or similar lenses (maybe tamron 17-50?) please point me in their direction.
Does anyone know what could be causing this? I've seen it on lenses that had a loose front element but can't notice anything loose or unstraight on this one.
And does anyone know if it is fixable?
I dont think having a professional repair it would be affordable as I only paid €120 for the lens, but I've taken apart primes in the past to repair successfully so might be willing to give this a go. If anyone knows of any guides to disassmbling this, or similar lenses (maybe tamron 17-50?) please point me in their direction.
