no prob at all, we all here to share
here's some primer on diopters (correct as I know it)
diopter is a measurement of lens magnification, a common optical rating also used in spectacle lenses.
There are 4 Nikon closeup lenses:
3T > +1.5, 52mm thread
4T > +2.9, 52mm thread
5T > +1.5, 62mm thread
6T > +2.9, 62mm thread
Once a closeup filter (diopter) is attached on to the lens, the focusing distance (at the lens infinity focus) will be determined by the diopter, regardless of the lens.
Hence, a +2.9 will have a focusing distance of 1000mm/2.9 = 334mm, a +1.5 will have a focusing distance of 1000mm/1.5 = 667mm. A +10, is then only 100mm....too close for most live subjects.
You can't use any diopter on any lens though. You have to make sure the focusing point is outside the lens, ie you obviously cannot use a +10 on a lens that is 30cm long, for example, coz the focusing point is inside the lens!
:gbounce: