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Sony A68 being used with Minolta lenses

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I have a Sony A68 camera that I purchased used on eBay to use with my collection of Minolta A-mount lenses, including a Minolta 80-200 mm f 2.8 and a Minolta 28-70 mm f 2.8, and many others.  I have been really disappointed with the quality of the images, they all look slightly fogged or like they were shot thru a dirty window. The camera appears to have had little use before me and the translucent mirror appears really crisp and clean when I look at it with the lens off. The images I get are in focus, just foggy. I have adjusted some of them in post to get them to be more bright but in low light it is really hard to get a decent image. Is this the price to pay for the simplicity of a translucent mirror that does not move? Or is this operator error? Maybe the camera could be set up differently? Most of my shots are taken in program. Anybody else had this issue? 

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It might be that the sensor itself is dirty? Initially try the sensor cleaning mode with no lens attached and pointing down.

If this doesn't work, you can inspect the sensor by flipping the translucent mirror out of the way. To do this, have no lens fitted, at the bottom of the mirror, in the middle, there is a little metal tab. Press this down and the mirror flips up to reveal the sensor. If it looks dirty you have a choice of getting it cleaned professionally, or risking cleaning it yourself. 

Start with a blower before moving onto a sensor cleaning brush. (the mirror is very fragile, so try to avoid touching it.)

To get brighter shots in-camera remember you have the +/- (EV) button next to your ISO button.

I find my A68 still works really well and I use it a lot for wildlife as the cropped sensor gives me more "reach" than my A99.

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