Originally posted by Raybo It's a good macro. I have owned one. But with the older macros (and this is an older one) they
only extend to a 1/2 ratio implying that in the context of film camera, the image on the film will be half the size of the 'real thing.---meaning that a 2" object could be focused full frame. but not a 1" object unless you used extension tubes.
newer macros will go to 1:1 without tubes.
You can use tubes with just a normal lens but they are not corrected for flatness of field
and depending on thte lens and the F stop you may see a lot of fall off to the edges, or actually in extreme cases encounter a photo that is 'in focus' in the center of the picture, but out of focus on the edges.
As for the specific lens---note that it is an 'M' Series, and not the newer 'A' series lens
so while usable on the digital cameras, it is a nuisance to use and a fair number of the exposure options don't exist. Personally, I got rid of all of my "M" lenses, and won't buy any more.