Do flat-bed / monorail camera manufacturers have some sort of efficient system f or switching between the GG and a roll-film back such as Horseman's optional rot ary back type 1 or type 2? (Please do not confuse this option with a revolving b ack for switching between horizonal and vertical shots.) Is this convenience wor th the extra weight and cost? Are there any other drawbacks to this option? I would like to purchase a view camera but am used to the convenience of an SLR.