Robert
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I don't have personal experience with the Nikkor DX 40mm Micro AF but all reports and comments from experienced owners I have read is that for close work 40mm focal length gets the lens/camera way too close to the subject, making it difficult to light and causing perspective/parallax issues particularly with three dimensional objects like insects or flowers. Another thing is that being internal focus, the focal length shortens the closer to the subject you get so @ 1:1 you may be down to 30mm focal length. Don't be sucked into thinking that a shorter focal length increases your depth of focus, In close up photography the rules are different, once you get close up there is little depth of focus no matter what the focal length, the DoF is down to magnification.
I use a 55 manual focus which is superb for DX. Auto Focus is pretty useless for close up work because you need to decide which part of the subject YOU want to be sharp, also you may want to push the sharpest part of the image back slightly so you don't wast half of your depth of focus in front of your subject. However, the D3300 practically requires an AFS lens of some sort I believe.
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Robert.
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