I may be wrong but I find it difficult to believe that any amount of dust or
paint flecks that a lens may accumulate internally can have any visible effect
at all on an actual photograph. I don't see how they can cause "flare" in any
way and the total surface area of the "dust" relative to the total surface area
of the glass has to be minuscule. It would be interesting to perform a test of
a common target between two identical lenses... on with "dust" and the other
supposedly clean.
Chuck Norcutt
> -------Original Message-------
> From: Sue Pearce <bs.pearce@xxxxxxx>
> Subject: [OM] Re: OM-1 Viewfinder
> Sent: Sep 29 '08 13:28
>
>
> Regarding the specks in the 90mm Macro, I am going to
> take a photo and post a link to it here sometime to
> get this list's opinion. I agree, I am going to complain to the
> seller, he mentioned a 'few specks of dust' which is, of course, of
> no concern (I am not one of those people who worry about dust in a
> lens), but this is really rather a *lot* of worryingly uniform
> (in terms of coverage across the lens element) specks, visible
> only in sharp, direct sun, which appears to make
> the lens rather flare-prone (looking through the finder,
> anyway, have not looked at film results yet) , because sunlight
> shining into the lens is obviously seriously reflecting off
> of them."
>
> Not tojump on you, Dawid, but this is a problem to me. I think this is the
> unfortunate offspring of ebay, as I don't remember specks of dust to be a
> problem years ago. I had a 35-70 purchased on ebay and returned because when
> the buyer shined a Tensor lamp into the front, he could see a single small
> speck. Since there was no speck visible under any other way, I think it must
> have been a reflection of something. I ferunded his money, and days later he
> announced on this list that he just purchased a complete E1 outfit. I think
> it may have been a speck of buyer's remorse.
>
> Specks of stuff, especially black paint, have been a reality in new lenses
> for decades, and we formerly were accepting of them. Not now.
>
> Don't worry, shoot and be happy.
>
> Bill Pearce
>
>
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