Voigtlander 21mm f/4 P Color Skopar Lens

Voigtlander Color Skopar 21mm f/4 P 

Check out the Voigtlander 21mm f/4 Image Discussion at RangeFinderForum

The Voigtlander 21mm f/4 was designed film cameras, not digital.

"Thanks for your usual excellent service. I got the Skopar 21 and have been using on my M9 with the latest firmware. By "locking" the ISO at 160 and selecting the older 21 Leica for correction, the results are very nice. I had been wanting this lens, but thought it might only work on my film Ms, so the firmware release pushed me over the edge.
 
I think the good reception of this tiny lens may have pushed Leica to do the new Super Elmar, but since they improved the firmware correction (for their new lens I'm sure) I'd expect also more demand for the Skopar ".  - Tom Brunson

To the left is the new 21mm f/4P in M mount, to the right the screw mount 21mm f/4

Released April 2007.  The new M mount 21mm f/4 P has the same optics as the previous screw mount 21mm f/4, but now sports a new lens barrel.  Produced primarily for the new Voigtlander R4's, the 21mm f/4P is not sold with a viewfinder as there is no need of an accessory 25 viewfinder for the R4A or R4M.  The 21mm f/4P in Leica M mount lens brings up the 28/90 framelines in Leica M cameras.  The 21mm f/4P  is styled similar to the Leica 35/2 pre-aspheric Summicron.  The optional square LH-1 lens hood  will fit the 21P, but the LH-1 is not suitable for the R4's as it blocks too much of the viewfinder.  The lens is supplied with a 39mm snap on front lens cap. 

The 21P has 8 lens elements in 6 groups, 39mm filter size, apertures f/4 to f/22 with click half stops, nearest rangefinder coupled focus .7 meter, scale focusing from .7 meter to .5 meter, diameter 55mm, weight 144 grams or 5.1 oz, with a field of view of 91 degrees.   On my M6 the 21 rangefinder couples from infinity down to about 2.5 feet,   but will SCALE FOCUS even closer to about 18."    This closer than expected focusing is a very nice feature which can add up to interesting adventures in perspective.

In 2010 two new 21 mm finders were introduced:  a metal combination 21/25 viewfinder using the improved optics.  On top of that, Voigtlander introduced the new 15-35 Zoomfinder.