Pen F - what lens provides a life-size viewfinder image?

[flip]

I know, it's an odd question, but I enjoy my RFs which allow me to view a scene with both eyes open. My 38/1.8 lens on the pen gives a VF image that's just a bit smaller than life size as my other eye sees it. I'm wondering if the 40 or 42 fit the bill.

 

[Sonnar2]

The 40mm is minifying as well. AFAIK the "two eyes open" don't work with SLRs because the eye needs to adjust "close focus" seeing the SLRs focussing screen and can't adjust the other eye at the object's distance at the same time. With a RF both eyes focus at the distance of the target object, seeing the RF patch clearly at any focussing distance.