OFF TOPIC: Leica Summicron Behaviour Puzzling

[thronobulax]

@Ian Grant (or anyone else who may know) I know this is far afield from large format lenses, but since you are our resident lensanista, I wonder if you're familiar with the Leica thread mount collapsible Summicron design? I have one in 50mm and it's giving me puzzling flare behavior. The sun burst is expected, but the lines on frame left below seem to be echoing the aperture blade edges. Have you ever seen anything like this before and/or is it expected? The lens is otherwise a strong performer (given that it was made in the 1950s and is single coated) and I'm wondering if it is need of a CLA. Quick and dirty scan of negative:

 

[Ian Grant]

Probably needs a CLA, my 1950s Summicron doesn't flare.

Ian

 

[thronobulax]

Probably needs a CLA, my 1950s Summicron doesn't flare.

Ian

Thanks Ian. The sun flare isn't surprising but those lines on the left seem not right to me so off to the CLA it goes.

 

[Ian Grant]

Those curved lines have to be reflections from the edges of the aperture blades, that must indicate a serious issue.

Coated lenses aren't the same as single coated, it's a misnomer. CZJ patented coatings using more than one layer I think late 1930s. Kodak Bloomed lenses were single coated but CZJ lenses has at least 2 coating layers post WWII, and the number of layers increased with lenses like the Colour Skopar, CZJ Panolar, Super Takumar etc

The Summicrons had state of the art coatings when released in 1953.

Ian

 

[thronobulax]

Those curved lines have to be reflections from the edges of the aperture blades, that must indicate a serious issue.

Coated lenses aren't the same as single coated, it's a misnomer. CZJ patented coatings using more than one layer I think late 1930s. Kodak Bloomed lenses were single coated but CZJ lenses has at least 2 coating layers post WWII, and the number of layers increased with lenses like the Colour Skopar, CZJ Panolar, Super Takumar etc

The Summicrons had state of the art coatings when released in 1953.

Ian

I concur with your judgment that the lines are reflections from the edge of the aperture blades. But I cannot imagine what issue that might be.

The serial number on this lens indicates that it was made in 1955 and thereby a beneficiary of a modern coating. I have read, however, that Leica further improved their coating sometime in the last 30 years or so but I do not have particulars.

Thanks for taking the time on this.