Archived posting to the Leica Users Group, 2005/09/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi JB....THANKS!... Now a question...CLB? Cleaning, Lubricating and B? peace D. On Tuesday, September 27, 2005, at 12:12PM, John Black <jblack@ambio.net> wrote: > > >> > >> > The film is showing streaks on bright areas, although they are >> > intermitent. My guess is that it is the curtain..I don't know. After all >> > I will have to send the camera for check-up. >> > >> > Here it is.... >> > >> > http://www.photo.net/photodb/photo?photo_id=3760181 >> > >> > > >I think I know exactly what that is... Had the problem with LTM cameras >myself. I'll bet the shutter speed was high, perhaps 1/500 or 1/1000. If >you will notice, the fabric of the curtains is wrapped around the end of the >blind edges and sewn, unlike M camera blind edges which have metal "lips". >When set to very high speeds, the shutter merely creates a very narrow >"slit" between the first and second curtain that travels across the film >plane. When shutters get old and need readjustment, the slit is too small >and the texture of the fabric creates "bumps" in the slit that double or >halve the effective speed by narrowing the gap. Normally this is not a >problem as the slit is wide enough that the fabric texture only accounts for >maybe 10-20% variation, not 50%. The M shutter corrected this by providing >a sharp, smooth metal edge for the traveling slit. > >Get a good CLA and it will go away. > >JB > > > > >_______________________________________________ >Leica Users Group. >See http://leica-users.org/mailman/listinfo/lug for more information > >