To dismount the eyes, you must return the lens barrel to the same position as when the eyes were mounted You can now mount the eyes, because in this position the base of the eyes will depress the ball bearing in the lens barrel, allowing the eyes to mount The square block of metal aligned with the focusing index mark in the pic above right, will lock in position at the 8 depth of field marking In this extended position, rotate the focusing barrel towards the camera's advance lever Pull the focusing barrel AWAY from the camera body (barrel will pull outward about 3 mm) Mount the lens ( lens will not mount if eyes are attached) Notice the eyes, there is some separation on the larger side, but it is still very usable.Ģnd Version Dual Range Summicron with simpler Leitz logo on eyes and original vintage front lens cap
Use a modern plastic front cap in the field. The classic chrome front caps are easy to lose, as well as dent or scratch. Right pic shows close-up of the eyes dovetail mount with the ball bearing. The eyes will not mount in normal focusing range because the interlocking dovetail mount ball bearing can only be depressed in the close focusing range. Left pic shows lens mounted without 'eyes' close up attachment in normal focusing range, from infinity to one meter. The eyes must be removed before mounting or dismounting the lens. 7 meters with your M camera, the Dual Range Summicron remains your most convenient choice to this day.
Using it in the close up range can be confusing, and so the detailed explanation below.
A 50 DR had the honor of having the highest resolution ever tested by the now sorely missed American photography magazine, Modern Photography, at over 100 lines per mm. A popular lens in the user market, many photogs consider the DR their sharpest lens. The flat dovetail mounting base for the eyes gives the DR has a unique appearance among Leica lenses. The removable 'eyes' provide parallax corrected viewing in the close focus range. The 50/2 Dual Range Summicron is one of the most interesting Leica M lenses with the closest rangefinder coupled focusing of any M lens. These lenses are extremely rare and very expensive. About 100 items were produced, having serial number ranging from 1.119.001 and 1.119.100. Summicron f=9cm 1:2 (Leica code: SOOZI-Wetzlar) This is the first version developed by Wilhelm Albrecht and produced by Leica in Wetzlar Germany.
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