Narual first of all thank you for your theral explanation
) That's why I LOVE this forum
I should've give you more informations about what I want.
I primerly use that lens for studio work and that means I use small aperatures.F 5,6 is largest aperature I use. Usualy it's around f8-f11. It depends on lighting set up. I don't like to push it bellow f16 because of difraction. When you have beutiful glass why not use it at sweet spot?
Tan68 I played with rynox 150 and that's diferent thing. I was thinking more like +1 close up lens so I don't get much magnification and distortion. Just to get me little bit closer. For example with native minimum FD i can frame head and neck. What I'm trying to get is forehead and chin. With extension tubes I lose light and that's not what I want. My goal with this thread was to get some first heand experience from someone who tryed that combo. Something like that on the link that Bob from Aus have posted.
Hope that helps.
Once again thank you all for your effort to help me.
I just love this forum