CV 10mm f5.6 M on Leica 240

[a.noctilux]

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If I put OUFRO extension ring between CV10mm and camera what would be my focusing range?

Does anyone know how to calculate this?

The idea is to take some close up pics of people yet I’d like to include lots of environment too.

At the momemt, my widest lens is 24mm and the human face doesn’t fit when in focus.

 

Ultra Wide Angle lenses don't work well with extension ring like OUFRO.

 

To answer your question...

 

I don't own 10mm but 12mm, just try the combo OUFRO + Voigtlander 12mm + M10 (to have LV) + ruler :

When in focus, the field is about 5cm large and the ruler is about 1cm from front lens = not really useful for what your planned "human face" project.