Hi, you cant go wrong in reassembling the elements. There is exactly one position for the 3rd element inside the tube - third element is a cemented group of two glas elements, and will fit only in one direction.
So if your lens is out of sharpness, disassemble the lens again and try reassembling. Be careful, because the cemented group of two elements often separate itself into his 2 single elements... !!!
Good luck
Henry



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