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Originally Posted by davidpretorius
Thanks mark, it is bk7.
Nothing i can do i suppose about that... Houghy was suggesting i could use some sandpaper to straighten it out a bit to fix the overcorrection! 
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Um, probably a bit earlier in the day for figuring mirrors for me
, Thats actually a high edge you got there , which is focussing short, so technically the edge is undercorrected ( far more likely scenario too ).
Mark