Archived posting to the Leica Users Group, 2000/06/11

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Subject: Re: [Leica] Rear element spots
From: Rick Dykstra <>
Date: Mon, 12 Jun 2000 12:14:35 +1000
References: <003f01bfd3c6$369234c0$47878ad1@jak>

Julian Koplen wrote:

> when I
> peer through the lens front-to-rear against a darkened background and shine
> a flashlight across the rear element, then the rear element seems to light
> up with numerous tiny bright specks, like many stars against a night sky. (I
> haven't had the nerve to subject my other lenses to the same test.)  There
> is no gross deterioration on picture quality, but I'm not confident I could
> tell if there was just a modest decrease.

Hi Julian,

I get this with every lens I own, regardless of brand.  The best thing
to do is to not look through lenses with torches, as it causes all sorts
of anxiety, and that I don't need any more of!

A Leica tech showed me this one day when I questioned a tiny fleck
inside a lens.  He said, 'Don't worry about that.  It's the only one you
can see, here have a look at all the others.'  He flicked on a projector
and shone it through the lens and invited me to look from the other end.
 EEEKKKK!  I took my lens back quickly and got out 'a there in a state
of semi shock.  

I've got lenses with bubbles, smears, grit, etc inside 'em. But they all
perform to the standard I would expect of them, based on their
reputations.  For example, my 100 APO Macro-R has two big bits of grit
and my 50 'cron R has a bubble, and they are both crackers.  My Canon
75-300 IS is relatively clear, and takes 'orrible pictures!

does this help?


Rick Dykstra

Replies: Reply from "Julian Koplen" <> (Re: [Leica] Rear element spots)
In reply to: Message from "Julian Koplen" <> ([Leica] Rear element spots)