Thank you very much, JL.JL wrote:I can not answer your questions, but probably you can ask Mark Berkery at https://beingmark.com/macro-illustrated/ . My understanding is that he uses a M43 camera coupled with a 60 mm Olympus macro and Raynox lenses, as you can see in his blog, he does get spectacular results.
Mark Berkery got amazing field macro images, using his M4/3 and superzoom bridge camera, diffused flash and Raynox DCR-150/250/150+250 stack.
His measured working distance of Raynox 150 is almost the same as my WD (about 8 inches).
I also learned how Mark uses a stick as one "tripod leg" and his own legs/knees as the other two, when he shoot field macro.
Member Johan's very helpful web site offers a calculator for Raynox lenses, whose results confirmed Mark's WD for Raynox 250 (at around 4.5 inches) http://extreme-macro.co.uk/raynox-adapter-techniques/
It also tells me that Raynox 250 offers about 1.55x magnification on my 150mm Oly zoom lens. Raynox 150 offers 1x and 150 stacked on 250 offers 2.4x. With that stacked 2.4x magnification, I can still get about 7.5 cm of WD and 7.2mm field of view, which is good enough for small ants.
I am convinced and will buy a Raynox DCR-250, even though my Schneider Componon S 50mm F/2.8 can provide similar magnification (but with less working distance, 6.5 cm vs 11.7 cm and without autofocus). Different horses for different courses, I guess (Schneider is likely better for studio macro and stacking).