Re: [Leica] Re: M6's scratching film - possible solution

[COLBYG@ULV.EDU]

Hi, Jim,

	Thanks for your insightful posts, including this one...

> What kind of slide film are you using? And where is the scratch?

> Some Fuji slide film (Velvia for sure) is curled immediately after
> processing and drying. It requires an hour or two of "hang" time, at room
> temp, to uncurl...

	Yep, it's Velvia. Unfortunately for this hunt, it's processed by me, in
the Wing-Lynch machine, and the transparencies are not mounted, they're
sleeved.
	Because I don't have the blamed things with me, I'm uncertain whether
the scratch is on the emulsion side or the base side. The scratches are faint,
and appear and disappear along the roll, absolutely parallel to the film edge,
which leads me to believe the cause is within one of the bodies.
 The curl is from side to side. If your lab mounts the
> slides too soon (while still warm) after processing, some slide mounting
> machines will scratch the film, within the frame, along one edge near the
> sprocket holes. It within the frame so you will see it when looking at the
> slide through a loupe. After finally solving this scratch problem, I used
> to have to put this special notice on my Fujichrome processing "please let
> the film hang for an hour or so, before mounting, to reduce curl", which
> solved the problem.

> Jim


> At 06:34 AM 1/20/99 -0700, you wrote:
> >Greetings,
> >
> >	I've got two recent vintage M6's, one of which may be scratching film.
> >Do you have experience with testing and detection, and subsequent repair? I
> >understand that it's possible to replace the pressure plate back, to
> polish the
> >pressure plate with a chamois.
> >	I've tested each body with factory-load Tri-X and wasn't able to detect
> >the scratching, but I've noticed it in some of my slides.
> >	With the Tri-X loaded there seems to be considerable resistance to
> >rewinding; I've been a little concerned about that.
> >	In advance, I thank you for your advice.
> >
> >-Gary S. Colby