Leica 90mm F4 Elmar Leica 90mm Elmar F4 The Leica 90mm F4 Elmar Collapsible was designed from the start be a travel lens along the lines of the Superb 50mm Elmar.  The lenses ability to retract neatly into the body when not in use, provides a ver slim profile that is easy to handle and carry.  The combination of 50 & 90mm collapsible Elmars would anad still does make an excellent choice for those that want ot take their Leica M on vacation with them but do not want to be burdened with carrying lots of lenses and equipment.  Another area where this lens shines is for hikers.  The original Mountain Elmar was designed to be compact and easy to carry, the 90mm Elmar collapsible has been designed for the same purpose.  Large apertures are seldom used for this type of photography where available light is abundant and the beginning aperture of F4 proves to be quite adequete for most situations.  The abscence of a huge front element aids in flare reduction.  Just like the 50mm Elmar, the 90mm Elmar is a fine performer and quite capable of first class results accross the aperture range.  The 39mm Filter size also lends itself well to many a photographers kit.  This lens is the Polar opposite of the 90mm Summicron and in all reality lends itself better to the beginning philosphy of Leica in that camera equipment should be small and easy to carry.  These are getting harder to find as the days pass and photograohers and collectors alike ad them to their Leica M kits.   90mm F4 Elmar 1954-1968 Type 1 SN#1,124,000-2,255,000 Finish Chrome Mount Rigid Lens Elements 4 in 3 Groups Filter Size 39mm Apertures F2.8-F16 Angle of View 27 Degrees Minimum Focus Distance 1m Units Produced N/A Weight 340 Grams