[rollei_list] Re: Bubbles in Schneider Lens!!!
- From: Nick Roberts <nickbroberts@xxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 27 Apr 2005 20:24:05 +0100 (BST)
The only lens I have that has any bubbles is a 50mm f2
Zeiss Sonnar for Contax. It performs exactly the same
as my other copy of this lens, as far as I can
determine from normal photographic use. And it has
quite a few bubbles, too!
Nick
--- Todd <todd_belcher@xxxxxxxxx> wrote:
> Bubbles do affect performance - but think about it -
> what percentage of
> lens area does the bubble occupy compared to the non
> bubble lens area?
> So what percent 'damage' does the bubble contribute
> to the image?
> 0.00001%? No one is going to notice that, especially
> when the bubble
> only contributes diffuse error. Minor scratches are
> the same. They have
> no noticeable affect on the image. It is only when
> scratches are
> numerous, or create a haze that contrast is
> noticeably lowered.
>
> Bubbles in older lenses are relatively common - even
> from Zeiss and
> Schneider.
>
> todd
>
>
>
> On 27-Apr-05, at 11:54 AM, Don Williams wrote:
>
> > At 09:54 AM 4/27/2005, michael Sta. Maria wrote:
> >> Hello all,
> >> This is probably a stupid question, but
> I
> >> just won a bid on *bay for a 210mm symmar-s lens
> and
> >> now I am questioning whether I really want it. In
> the
> >> description there are bubbles barely visible
> between
> >> the lens elements if seen at an angle. Does this
> >> affect image quality? Where do these bubbles
> come
> >> from?
> >>
> >> Please have a look: Item number: 7508963819 on
> *bay
> > I think conventional wisdom supports the sellers
> assertion that glass
> > bubbles or cement voids won't affect the result
> unless they are large
> > or
> > numerous. The main effect is on the mind of the
> owner in using
> > something
> > "not perfect", an unfortunate trait I share with
> many folks.
> >
> > I think I have even seen paperwork with lenses
> saying the same thing.
> > The
> > only possible problem could be in extremely high
> contrast situations.
> >
> > I would guess that Dick Knoppow would agree.
> Let's see what he says.
> >
> >
> >
> > Don Williams
> > La Jolla, CA
> >
> >
> >
> >
>
>
>
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