I tried cleaning it, and it's like the composition of the glass changed.
Yes, it runs deep. I may try again as it is such a shame that such a
nice lens has met such an end.
A similarly weird condition is sometimes found in the 16mm fisheye.
That element looks sandblasted.
___________________________________
John Hermanson | CPS, Inc.
21 South Ln., Huntington NY 11743
631-424-2121 | www.zuiko.com
Olympus OM Service since 1977
Gallery: www.zuiko.com/album/index.html
On 1/24/2011 11:36 PM, Andrew Fildes wrote:
> That 8mm Zuiko that John H. mentioned is pretty much sealed.
> Focussing, such as it is, is achieved by racking the entire lens
> assembly out. But there is something really weird going on in the
> small air space between the tiny rear doublet and the small third
> element, which are seated snugly in a tube with spacer rings. John -
> no chance that the third element could be repolished and recoated? Or
> does that 'milkiness' go really deep? Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 25/01/2011, at 10:17 AM, Moose wrote:
>
>> On 1/20/2011 11:04 AM, George Themelis wrote:
>>> 2. Are zoom lenses more susceptible to haze vs. fixed focal
>>> length lenses?
>>>
>>> And what causes this internal haze?
>>
>> I see this has been addressed, but one factor not yet mentioned.
>> None of the lenses you are talking about are sealed. So when the
>> elements move, air is pushed around, both redistributing anything
>> in it to begin with and 'pumping' air in and out of the lens.
>>
>> As a general rule, prime lenses have less element movement than
>> zooms and short focal lengths have less movement than long.
>>
>> Sooo. Things that cause haze, fungus spores, moisture for them to
>> sprout, dust, dispersed petroleum fractions from helical grease
>> breakdown, smoke, smog, cigarette smoke, etc. are more likely to be
>> found in some lenses than others.
>>
>> Use a wide range, long, single control zoom actively, and you cycle
>> lots and lots of outside air through it. All the detailed bits
>> inside act like filter elements. So shoot only in dry, clean air.
>> :-)
>>
>> A. Movable Moose --
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>>
>
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