I just wanted to share this with you all...I was out and about yesterday testing my 24~70/2.8 along with the singh-ray variable ND+Polarizer bla bla bla...BTW, the lens is AWESOME. PERIOD.The Singh-Ray works great, but does do a tag vignetting at 2.4.So I get home, and check out the shots, especially the long exposures.What?! There is a very large persistence black dot on my pics! All on the long exposures.So I start testing and testing and testing.It *must* be dirt on the sensor as the dot changes color and intensity the longer I expose...not a dead pixel!So I say, cool, let me clean it. Thats when everything went down hill. I not only did not remove the dot, but added about 10 billion more! The more I cleaned the more it worsened. And yes, I was using qtips. NEVER EVER EVER EVER <billion time more> use qtips.Least to say, I did not sleep.This morning, I drove down the a pro shop, got some Eclipse solution, a box of Sensor Swabs (12 per box), a large blower and went to work.7 swabs later, 1 hour of cleaning, testing, cleaning, testing, I got down to 2 very small dots at the extreme corners at 22 second shot.I'm going to leave it at that!Needless to say, don't use qtips...BTW, very easy to do!Phew, scared the #### out of me!Thats it, just wanted to share my pain and joy!~Kam
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