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    pcr1040 got a reaction from Thad E Ginathom in A7R3 AF-C at infinity not sharp   
    Thanks to both responders.  I guess I read the information about Back Focus Adjustment as you guys did.  So I am inclined to think the issue is really an issue with this lens.  It seems to sharpen up at 300mm when I stop down to f8.0,  But even then it's really not as crisp as I would like.  In truth I think this is a design issue for most long zoom lenses.  They all seem sharpest at the shortest focal length.  My other system is a Panasonic G9 with the 100-400mm lens and it too is sharpest at the shorter FL.  However, even at 400, it seem sharper than this Sony lens at 300mm.
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