I've seen play in the helicoid threads themselves as if the grease has dried
up. Other times, (with some lenses) intermediate tubes in the main assembly
come loose.
If you are going to open the mount, look for 2 prongs, 180 degrees apart
that slide in notches in part of the helicoid. Sometimes these come loose
too.
John
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----- Original Message -----
From: Olaf Greve <Ogreve@xxxxxxx>
To: 'olympus@xxxxxxxxxxxxxxx' <olympus@xxxxxxxxxxxxxxx>
Sent: Monday, July 12, 1999 3:59 AM
Subject: [OM] 35-70/4 with play in it ; fix needed...
> Hi,
>
> Unfortunately as of a while ago my 35-70/4 has started to develop a
> significant amount of play in it, right where "the mount is connected to
the
> rest of the lens" (sounds a bit vague, but I don't know exactly how to
> describe it better).
>
> When looking at it, it appears it can easily be cured by tightening the 3
> screws in the mount, however, such is not the case as they are already
> tightly screwed in and don't go any further.
>
> A while ago I consulted Hans about this and he gave me some rough
> experiences from when he tightened his 50/3.5 macro lens. Apparently it's
> important to look really well where each pin (etc.) goes, also some things
> (DOF button etc.) apparently are spring loaded, so there might be a risk
> that these buttons shoot out when untightening the mount.
>
> Is there anyone (John?, anyone else?!?) who can shed some light on how to
go
> about this in general, and if possible, how to particularly cure this
zoom.
>
> After the bad events that happened when I tried to service the 300/4.5
> myself, I'm a bit hesitant to see another beloved OM family member get
> KIA... Nevertheless, if I leave the lens "as is", the play might get too
bad
> and result in far worse results, so I think the lens should definitely be
> tightened. The question is now, should/can I do this myself, and how?
>
> Also, what kind of screws are used on the inside of the Oly lenses, are
they
> the same type as the cross heads in the mount? Finally, are there any
> specific pitfalls to be careful with (the fact that it's a zoom might mean
> it has a complex lay-out)?
>
> Cheers!
> Olafo
>
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