Allan, Well, Carlos filled in most of the gaps by now. He lives in a different time zone. I would like to add just a few things. The Rolleimeters were made for cameras with the non-detachable hoods only. So they will not fit any camera with the later detachable hood. There are 4 possible combinations: 3.5, 2.8 and without lightmeter, with lightmeter. The older ones are for cameras without the lightmeter. Obviously they lack the slot for the lightmeter. They have serial numbers from 1000 - 3999. The swing arms are clearly marked either "3.5" or "2.8". The 3.5 is made for the Rolleiflex 3.5 / 3.5A from nr. 1.100.000. These cameras should be calibrated by the alternative method without using the disc. The 3.5B can be calibrated using the disc. The 2.8 is made for the Rolleiflex 2.8C. The disc can be used. Later models have the slot for the lightmeter. No serial numbers. The swing arms are clearly marked. The 3.5 was designed for the Rolleiflex 3.5C but this one will fit earlier mentioned 3.5 cameras. Disc can be used. The 2.8 was designed for the 2.8E but will fit earlier mentioned 2.8 cameras. Mine is a 2.8 with slot. Unfortunately I had to settle for an F-type Rolleiflex ;-) so I have not actually used the Rolleimeter. Ferdi. ---- Ferdi Stutterheim, Drachten, Netherlands. Op 31 dec 2011, om 00:30 heeft Allan Derickson het volgende geschreven: > I’ve been thinking of getting a Rolleimeter, the add-on rangefinder for the > non-removable hood Rolleis, to try for photographing my active little boy. I > see them on Ebay but some don’t appear to include the calibration rings. Are > those rings absolutely necessary or can you somehow set infinity without them? --- Rollei List - Post to rollei_list@xxxxxxxxxxxxx - Subscribe at rollei_list-request@xxxxxxxxxxxxx with 'subscribe' in the subject field OR by logging into www.freelists.org - Unsubscribe at rollei_list-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject field OR by logging into www.freelists.org - Online, searchable archives are available at //www.freelists.org/archives/rollei_list