Quote Originally Posted by PhoebeG
I just purchased a new Tamron Sp90mm Macro lense for my Nikon D70S. The lense is rated at a max of f32, but I'm getting the aperture to go down to as low as f51 in the view finder diplay. Camera is in in "M" mode and lense is locked at the f32 mark on the lense barrel (which I belive means the camera controls the aperture).

It seem also that when I go to this small aperture, I can see ALL sorts of dust and junk in my images which I assume is on the bypass filter.

What gives? I shoot a lot of macro and I'm always open to a little more DOF, but this seems wrong.

Thanks for any ideas,

Phil G.
First M stand for Manual, focus and aperture. With micro photography you focus then stop down for you DOF. It depends also one what your taking the micro of on how far down you can stop down. If it is moving you going to have to put up with less DOF.