[rollei_list] Re: Bubbles in Schneider Lens!!!
- From: David Seifert <dseifert@xxxxxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Wed, 27 Apr 2005 12:51:15 -0700
I caution that the OP says that the bubbles are "between the lens
elements". Wouldn't this imply the "bubbles" are actually separation.
If so then the advise is probably much different.
David
Todd 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
>
>
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>On 27-Apr-05, at 11:54 AM, Don Williams wrote:
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>>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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