Archived posting to the Leica Users Group, 1998/02/04

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Subject: Re: [Leica] weight difference with lens
From: Steve Hickel <>
Date: Wed, 04 Feb 1998 20:23:00 -0500


I am certainly no expert, but those tednricals sound like separation web to
me. Meaning the lens is separating from another lens. Anybody. Correct me
if I am wrong. Still learning.


At 03:51 AM 1/27/98 +0700, you wrote:
>Recently I bought a used Summilux 35mm/f1.4 Titanium lens.Without filter
>or lens hood, I  check out the weight of the lens on an electronic
>jewellery scale.It weights 223.33gr (0.49lb).According to the Leica M6
>brochures and the Leica M Compendium by Eastland , the weight for the
>titanium lens is 195.00gr (0.43lb).It seems that there is more than 11%
>weight difference! Is this normal? I check my other R lenses with the
>same scale and they are the same or very close to the book's figures.
>Next, I used a 6x loupe(can't see it with the naked eyes) to check tke
>srew heads. I found out that two out of three screws on the furthest
>front chipped(like marks left over from over tightening with the screw
>driver). There is another one screw that fasten the aperture scale has
>this same mark.I doubt that they came out from the factory in this
>condition.What is your opinion?
>As I look through the lens with wide aperture against a light source
>(the usual buying used lens procedure ) I could not see anything unusual
>i.e. clean glass from the front or the back.When I check the inner glass
>from the back with the 6x loupe, I SAW a mass of very thin lines ( f
>iber-like ) spreading all over the inner surface.I could not tell what
>are those as there are small sratches also which I can see because they
>reflect light differently.
>I just like to figure out why the outermost glass are smooth and clean
>but inner ones has all these extras.
>I THANK YOU for your opinion.