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I have this same problem with my Sigma 24-70mm F2.8 producing soft focus images and its at the stage now where I never use it anymore. I will be getting it sent off to be checked over. But with every other lens it's perfect.
I have one of these exact ones fitted to my 172 as I got it 'dirt' cheap, i had it checked over before I had it fitted and was told the welds are okay. I have ran it everyday for the last 4months and have noticed no troubles. Its also made a massive gain along with a decat, matched inlets and a...
I was asking myself the same question as I have a very similar sub, mine is wired into a Phillips home cinema system though. As there is two amps I was told to turn the FQ up to around 140-170, this then let's the amp from the home cinema system take over and control the sub. Having done this it...