Jorge,
I understand!!!By way of information, in the event you wear that beast of a camera out...they have a Folmer and Schwing 12X20 with 44 inches of extension up for sale on Ebay as we speak. That should get you up to about 1100 mm. Will that work? Just to keep you appreciative of your climate down that way, we are at 33 degrees and freezing rain here tonight.