Damage to a rear lens element is always more visible in pictures than the
same damage on the front. The damage you show is extensive, and in the
center of the lens element. I think any pictures would be adversly
affected.
When it comes to ebay I've learned to always expect the worst. If they say
there is damage, but aren't specific...
Paul
>
> I just magnified the image by a factor of 4 or so - and the damage is
> quite
> extensive. I'm fairly sure looking at it, it will make a difference to
> your
> photos - and could even interfere with the cameras autofocuis system (if
> any). You may have to use manual focus -will be interesting and useful to
> see a shot or two from it - useful to others too in that we/they could
> then
> judge whether or not to bother buying a lens in a similar condition in
> future.
> Allan
>
>
> PS No trees were harmed in the sending of this message and a very large
> number of electrons were asked their permission to be terribly
> inconvenienced. (And threw a party for them afterwards for being really
> cool
> about it).
>
> Disrupting the unnatural balance that you, as a conscious human being and
> a
> confused mass of energy, have created.
> -Disturb the mind -
>
>
>
>
>>From: "Allan Mee" <bigalsgroups@xxxxxxxxxxx>
>>Reply-To: olympus@xxxxxxxxxx
>>To: olympus@xxxxxxxxxx
>>Subject: [OM] Re: ( OM) Photographs of lens damage
>>Date: Sat, 04 Nov 2006 13:44:46 +0000
>>
>>
>>Take test shots (at all apertures, both in and out of focus) to assess
>> the
>>effect of the damage to the lens - you might be lucky and merely get a
>> bit
>>of a light 'mist' effect which can be dealt with using appropriate
>>software.
>>If you're really lucky, at some apertures, it may not even be noticeable
>>without close examination. You could be fortunate the damage is to rear
>>lens. If light is refracted, it wont be moved from where it should fall
>> by
>>much.
>>Look at it like this to see what I mean:
>>
>> ------ Front glass (scratch on
>>front
>>glass)
>> /\
>> /| \
>> / | \ (possibly large displacent)
>> ---------- Rear glass
>> --|---|----|--- Film plane
>>
>>
>> ------ Front glass
>> |
>> |
>> |
>> ---------- Rear glass (scratch on
>> rear
>>lens)
>> /|\ (possibly small displacement)
>> ---|-|-|---- Film plane
>>
>>If a vertical line were the proper path, you can see that a scratch on
>> the
>>front of the lens would mean a larger displacement from the proper path
>> by
>>the time it reached the rear of the lens. But from the rear of the lens
>> to
>>the 'film plane' may be small enough that the light path hasn't deviated
>> by
>>much.
>>Another possible effect could be just (or and) some false colours due to
>>the
>>damage since the blue and red ends of the spectrum may refracted
>>differently
>>by the damage.
>>You may also be lucky in that the damage seems to be mainly just below
>>centre (near the area where the rays are normally refracted least by the
>>lens - which may help reduce the effects of the damage). Unfortunately,
>> it
>>is the are where most people and cameras usually focus and meter most
>> with.
>>Can you see the damage when yoiu look through the viewfinder? If you can
>>see
>>it, so will your film/sensors. If you can't see it, then you might be
>> lucky
>>enough to still get decent pictures.
>>At worst, you can try re-selling the lens to recover your losses (at
>> least
>>to some extent).
>>Allan
>>
>>PS No trees were harmed in the sending of this message and a very large
>>number of electrons were asked their permission to be terribly
>>inconvenienced. (And threw a party for them afterwards for being really
>>cool
>>about it).
>>
>>Disrupting the unnatural balance that you, as a conscious human being and
>> a
>>confused mass of energy, have created.
>>-Disturb the mind -
>>
>>
>>
>>
>> >From: Moose <olymoose@xxxxxxxxx>
>> >Reply-To: olympus@xxxxxxxxxx
>> >To: olympus@xxxxxxxxxx
>> >Subject: [OM] Re: ( OM) Photographs of lens damage
>> >Date: Sat, 04 Nov 2006 03:45:31 -0800
>> >
>> >Brian Swale wrote:
>> > > Hello all
>> > >
>> > > Recently I bought at an auction, a Zuiko 21/3.5, knowing it had some
>> >kind of damage
>> > > to the rear lens element. I did not know what kind of damage and
>> could
>> >not ask as the
>> > > auction was closing soon after I discovered it.
>> > >
>> > > It arrived yesterday, and I found the damage was right into the
>> glass.
>> >Looks as though
>> > > the rear lens cap has come off while the lens was joggling around
>>loose
>> >in a camera
>> > > bag, and rubbed against something hard. Cleaning does not shift the
>> >marks.
>> > >
>> > >
>>http://homepages.caverock.net.nz/~bj/photography/zuikoholics/recent5.htm
>> > >
>> > > It will be interesting to see if this damage has any discernible
>>effect
>> >on images.
>> > >
>> >Oh, bad luck, Brian, I'd hoped it wasn't so much damage. It will almost
>> >certainly affect images if left as is. Light will be refracted and
>> >reflected and cause at least flare, if not actual bright spots.
>> >
>> >T'were mine, I would cover the inside of the damaged areas with
>> >something black, finepoint Sharpie ink, perhaps, to kill reflections
>> and
>> >refractions from the rough edges. It's possible that there will still
>> be
>> >a darker area in images, but that should be easier to correct. Perhaps
>> >with a retrofocus design, where the rear node is actually behind the
>> >rear element, even that won't happen.
>> >
>> >I know you aren't into post processing and have computer limitations.
>> >Still, one possibility if there is a darkened area would be to take an
>> >image of a simple white subject, reverse it, and make an exposure
>> >correction mask that just compensates exposure where it is affected. by
>> >the damage.
>> >
>> >The other thing I would do is keep an eye out for the same lens with an
>> >undamaged rear element but with damage elsewhere which renders it
>> >inexpensive.
>> >
>> >Moose
>> >
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>>
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