Deja Vu. Really...what is the difference between 4x5 lenses at a given focal length? There are so many options and I'm already by nature rather indecisive. If anyone could give their input on the following things which might help me figure this all out, I'd appreciate it. All things being equal: 1) Am I likely to notice a difference between the APO and non-APO version of a given lens? 2) Am I likely to notice a difference between a MC and single or uncoated lens? 3) Will I generally be disappointed by going with the cheapest option? 4) Are there any lenses I should flatly try to stay away from? Thanks.