Quote Originally Posted by Willie Jan View Post
i am using a 120 rodenstock macro lens.
When using it at 3:1 i loose 6 stops of light.

Is there someone who did a test between using a closeup lens together with a macro and only using a macro lens? I would like to know if there is a quality drop when using a close up lens. At this moment i do not own a closeup lens, so I can't test it...
According to the Manual of Close-up Photography, at that magnification, you need to increase exposure by 4 stops. Be careful when stopping down, too much and you will get diffraction. Enlarger lenses do work very well as macro lenses. Some longer focal length lenses will not function properly for cloe-up or macro due to their construction. Reversing a lens is most times a better way to achieve the results you are after.