[rollei_list] Re: Bubbles in Schneider Lens!!!
- From: Todd <todd_belcher@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 27 Apr 2005 12:11:10 -0700
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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