> -------Original Message-------
> From: Lukasz Grabun <lgrabun@xxxxxxxxx>
> >
> On 5/8/07, chucknorcutt@xxxxxxxxxxxxxxxx <chucknorcutt@xxxxxxxxxxxxxxxx>
> wrote:
> > I don't have an OM-4 but I dont' think it has a motor drive socket
> cap. In any case, the
> > light leak shows on the bottom of the frame which means that it's at the
> top of the film
> > gate in the camera. Since the leak covers the sprocket area of the film
> I'd say it has to
> > be light leaking around the foam seals. I'd check the foam on the top of
> the back and
> > also check to see it the door might be a little bit sprung. Also check
> around the counter
> > resest pin.
>
>
> One question, if you don't mind. You said: "the light leak shows on
> the bottom of the frame which means that it's at the top of the film
> gate in the camera". For me, it seems somewhat inconsistent. Would
> you, please, elaborate on that?
The lens inverts and reverses the image such that the bottom of the image is
recorded at the top of the film as it rests in the camera. If you see the
damaged portion on the bottom of the frame then the leak was coming from the
top side of the camera. Also, when the film is in position to be exposed by
the lens and shutter, the sprocket holes of the film are hidden from the lens.
If the sprocket hole area is exposed it didn't come from the lens and shutter.
It came from a leak behind the film which means bad seals on the film door.
>
> I will check back seals, again, but here are two more details that put
> more light into the matter:
>
> [1]. Once I was putting my camera back into the bag, bottom side down,
> lens pointing at the blue sky but lens cap was on. I accidentally
> pressed shutter release button and made a picture. To my surprise it
> turned out to feature the same light leak pattern as shown on a image
> I linked to in a previous post.
As I explained above, the shutter and lens have no part in the leak. The
damage done by the leak could have occurred anwhere along the top edge of the
film door wherever the film is out of the cartridge and not yet tightly wound
on the take-up spool. It would have happened even if this frame was
>
> [2]. One of the "muffle" foam (wasn't able to find a better word for
> it), the one that mirror leans on when the shutter is released (there
> are two of them, "L" shaped and both are located in the front
> "chamber") came off on the end. Nothing serious, the unstuck part has
> no more than 2mm of the lenght but I thought it may be worth
> mentioning. Now, if *this* is the issue, is it possible to change it
> at home without dismantlening the camera, provided I have all the
> tools and supplies?
These are bumpers meant to cushion the mirror as it flies up. They have
nothing to do with the leak. If one is a little loose it's not a problem yet
since it's still serving its purpose as a shock absorber. The mirror bumpers
can be replaced at the same time the light seals are replaced. There are two
types of foam used here. One is self stick foam that already has adhesive
applied and is covered by a protective sheet that you peel off when ready to
use. That's the type that should be used for the mirror bumpers. It can also
be used for light seals but that's not recommended. The adhesive tends to
stick to the sides of the foam channels and makes installation very difficult.
It's best to use a thin bead of liquid rubber cement in the channel and then
use foam strips which do not have adhesive already applied. All the old foam
and adhesive must first be completely removed. I think it was Jeff who offered
you a set of replacement foam strips for an OM-4. John Herman
son (our resident repair guru) also sells pre-cut foam repair kits and you can
find complete cleaning and installation instructions starting on this page:
<http://www.zuiko.com/index_012.htm>
ps: to John. The flashing arrows at the bottom of the page were not
immediately recognized by me as forward and back arrows. Maybe I'm a little
slow this morning.
Chuck Norcutt
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|