© 2013 Oscar Cintronmarina
The Regula RM, except for the name, is the same as the Cita III.  The Cita III has the additional strap lugs which most of the RMs do not come with.  There are, however, some RMs that come with the lugs as well.  I guess they dropped the name Cita III and changed it to Regula RM because the  “RM” let a potential customer know that the camera had an “R” or rangefinder and an “M” or light meter. These cameras can be found with different tops.  The older tops have screws to keep the transport lever and rewind buttons in place.  The newer tops did away with the screws entirely and used a better design to do the job.  These tops have different light meters too.  The older version came with a metal cover with two levels of  sensitivity.  The later one did away with the cover and the two levels of sensitivity and came instead with a black or red BEWI button that you pressed down in order to activate the meter.  With the older version the covers were very delicate and prone to breaking off; so, switching to the newer one was a wise decision.  Both were Gossen meters, by the way. Another difference between the two bodies is that older ones allow the tops to come off much easier with just a flat-tip screwdriver while the later model requires a special tool to remove the film transport lever.  The latter has the advantage in that you can adjust the rangefinder in the back while the former requires the top to be removed for this adjustment to be done. The Regula RM which I used to photograph the pictures below is the Regula RM with the Carl Zeiss Tessar 50mm 2.8 lens.  However, the Regula can be found with 4 different types of lenses: 1. Carl Zeiss Tessar 50mm 2.8 2. Steinheil Munchen Cassar S 45mm 2.8 3. Rodenstock-Trinar 45mm 2.8 4. Enna Werk Munchen Ennalyt 45mm 1.9 The Tessar is the only one of the 4 that has a 50mm lens; the rest have the 45mm lens.  And the Ennalyt is the fastest of the lenses, coming in at 1.9 and compared to the other lenses it has a huge eye.  If the Regula RM comes with another type of lens, I’d like very much to see it. The camera is designed so that everything is coupled providing the convenient ability to shift to a different exposure combination.  It also allows one to go fully manual as well. These two-toned cameras are very sleek and well designed, especially the later models.  They come with all the basic tools needed to go through a roll of film.  You can even do flash photography.  All this without any battery.  The light meters still work in most of them and of course you’ll find that, like other cameras, they have their woes too.
King Regula RM (Tessar) Photography
Regula R, RM, IIIc, IIId Manual