B4 to MFT Mount

I beileve that is the one I ordered. I'm excited to see how the Canon J21ax7 is going to look.
7.8mm-164mm (15-328). I realize the doubler needs to be engaged for coverage.
Does that effectively make the lens 30mm-656mm w/ a couple of stops lost?

Thanks for the pic, very cool!
 
In terms of mm it's 7.8-164mm and you double that with the extender. If you look upon it and compare with FF yes it will be around 30-656mm at about F3.6-F5.6. Great specs for any lens.
 
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