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Firstly - I was wrong to say Coma, it is as was noted below, field curvature and the flattener will fix it.
You won't need a tak diagonal for the '60. It is the FSQ that has this problem. I used a cheap diagonal from a chinese scope and it worked fine. There is so much back focus with it. Actually to get it to focus striaght through you will need to the use two tube extenders that are part of the kit.
PS be careful when looking for the silver eyepiece holder. It should be wrapped in bubble wrap and is small enough to look like just a bit of packaging. I nearly threw mine out.
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