As a Nikon RF owner and user, and a Bronica S2/ECTL user, I'd be curious to know how good the coverage of these RF lenses is over the 6X6 format. I wish I could tell you anything about the 180mm RF lens but I've never had longer than a 135mm in Nikon RF mount. 180mm f/2.5, really? That sounds very impressive, but likely shallow depth of field so focusing it via the rangefinder built into an SP or S2 would perhaps be less than accurate. Perhaps intended for use with an external mirror box?