The Leica lens, E. Leitz Wetzlar “Summar” 50mm (5cm) f/2 is notorious for having internal haze, clouding images sometimes giving a desired warmth called “Leica Glow”. Some desire it for using as a portrait lens or other such use as the effect is warranted.
Before I show you how I got my 1939 Leica Summar lens apart to clean the haze, I first cleaned some kind of dried gunk on the front element that resembled very bad cleaning marks.
I had seen it before on my former 1936 Summar and other people complaining about their’s calling it cleaning marks, so it must be a somewhat common thing. This time it was more crusty, uneven looking that led me to believe it wasn’t just the glass itself.
After completing the service, cleaning, repair, adjustment on the 1936 Leica IIIa, I shot a test roll to see if everything was working as it should. There are a lot of things that can be wrong on an 80 year old camera. A test roll can show if the film is advancing correctly, getting the proper space between images on the negative, shutter speeds are correct, the rangefinder and lens are in good sync so the images come out good and clear. etc…
The first test roll showed that the shutter was at the right speed but on the faster speeds, it was not adjusted correctly. The second or “closing” curtain was catching up with the first curtain part way across the film area.
Before giving my Leica IIIa a semi-complete CLA, I want to tackle the slow speeds being sluggish problem. Thanks to the Internet, I found a few sites that explained how truly easy it is. I mean, anybody can do this task and perhaps bring their 75-80 year old camera back to it’s former glory.
Two screws to get started is all it takes. The hardest part is putting it back in and that just takes some dexterity. This method is possible without a complete removal of the body shell as is needed for the newer IIIb. IIIc, IIIf, IIIg, but if you are planing a shell removal for whatever reason, CLA, investigation of a problem or the like, then by all means, wait until then, it would just be easier to put it back in but taking it out makes no difference.
Giving my 1936 Leica IIIa a CLA. It basically works fine, the shutter fires on all speeds but the slow speeds are sluggish. The curtains have previously been changed, maybe even twice in it’s 78 year history and look good. Overall there is brassing on the top and bottom plates but from normal heavy usage telling me it was well loved. From what I can see, the inside looks clean-ish, no major rust or anything like that.
Above, showing the external condition, dirt and a reddish oxidation to the Vulcanite (red circle) and dirty internal glass.