This is the same barrel size as the 30CM in the other sale. This is the 21CM version though. Same as the 210mm Lanthar but you start at F9 instead of the luxurious f4.5. But luxury is expensive. You'd pay about $2100 for a Lanthar! This is missing the ring that covers up the front thread. These had mounting threads front and back for versatility. This also has a little 1/8" goober on the front glass. No effect on the superb images, but price suffers. Packard shutter and board not included of course, but the flange IS. $185. This covers up to 5X7.