Exposure times not correct

[sjefjans]

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I have tested my mp (film) and found out thet the lower exposure timing is not correct anymore. I dont know what happened. What could be the reason for this?

[a.noctilux]

May it be time for a "Clean Lubricate Adjust" (CLA).

Mechanic is just that.

 

At some point, Leica M need some services by a competent tech.

 

One of the big reasons why I'm happy to buy new M-A, my M2/M4/M6/MP needed expensive CLA (or repair) from time to time when good function is required.

As side note, you may NOT use those slow speed.

 

My decades long experience of Leica M teached me that it's better sending soon for CLA before beeing upset by mediocre/bad results.

Edited September 10, 2017 by a.noctilux

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[250swb]

In which aspect is it incorrect, exposure times too long or too short and by how much? Are your incorrect exposures because of an inaccurate meter?

[michaelwj]

How did you test it? How wrong were they? They only have to be within 1/3 of a stop to be accurate enough. How often do you use the slow speeds?

 

Now, its a mechanical camera that's designed to be used. Sitting idle is not good for keeping it working smoothly. I was once told that every month or so (between films) to run through all the speeds a few times to keep them all in order. I used to have slow speed sticking issues, haven't since I started exercising them (years and years now). Before you spring for a CLA, give it a workout.

[spydrxx]

Most manufacturer's tolerances on mechanical shutters are within +/- 1/3 of an f stop on a consistent basis. If yours isn't AND you use slow speeds a lot, then maybe a CLA is worth it. Otherwise, I wouldn't concern myself, as mentioned earlier, film latitude usually will adeuately compensate.

[sjefjans]

I was alarmed when I was going to do a shot with one sec exposure. The sound was different. Not cl-rrrr-ick but click. That's why I shot some photos with 1 sec, 2, 4, 8 15 etc. The slower exposures were wrong. I hardly use these exposure times....

[Shac]

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Were the long exposures over or under exposed, or ??

[TomB_tx]

These longer times all rely on a separate "clockworks" escapement that delays the second curtain release. Sounds like a CLA is needed for the slow speed mechanism.

[sjefjans]

Were the long exposures over or under exposed, or ??

underexposed