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Under exposure issue with LiveView/EVF

arthury

By arthury
in Leica M (Type 240 / 262)

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arthury

arthury

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Posted (edited)

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Problem:

- When using LiveView or the EVF, I get badly underexposed images 20-30% of the time.

- The amount of underexposure is in the order of -2ev to -3ev (bad and unusable)

 

How to reproduce the issue:

  1. Turn LiveView or EVF on
  2. Focus the subject using Focus Peaking
  3. Release the shutter

 

The first image is usually good if you have started from a cold boot-up.

 

Wait for 20 seconds

- Focus using Focus Peaking

- Release the shutter

- And, you should get the underexposed image.

 

If you want to repeatedly get the underexposed effect, wait for another 20 secs and repeat it.

 

Cause?

a) It seems like I need to keep the sensor warm in order to get correct exposures after the first exposure from a cold start-up. I thought there is another sensor (the light meter) that is handling exposure apart from the CMOS?

B) Does the light-meter goes into a sleep mode after 20 seconds when in LiveView/EVF mode?

c) Looks like a firmware bug to me (I hope).

 

Settings

  1. If I unplug EVF or not use LiveView, everything behaves as normal.
  2. Exposure set to Classic/Center-weighted or Advanced (Multi-segments) --- did not make a difference
  3. Using latest firmware 1.0.0.12 (came installed)

 

Have you guys seen this?

Edited by arthury
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arthury

arthury

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What are your camera settings?

 

Aperture Priority Mode?

Yes

 

Which lens and aperture?

Tried 35mm/2 ASPH and 50mm/0.95 Noctilux ASPH (both wide open and mid-tier aperture) --- no difference

All coded lenses.

 

Low light or outdoors and bright?

- tried both with indoor lighting (at night) and indoor window light (day time)

 

Shutter speed?

- correct exposure shutter speed = 1/25sec (day time) and around 1/12 sec (night time)

- bad exposure is almost always (1/45sec) and shutter had a different sound

 

Are you metering and then setting the shutter/aperture?

- yes, I metered and received exposure conformation dot on the top right-hand corner of the viewfinder.

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jdlaing

jdlaing

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Aperture Priority Mode?

Yes

 

Which lens and aperture?

Tried 35mm/2 ASPH and 50mm/0.95 Noctilux ASPH (both wide open and mid-tier aperture) --- no difference

All coded lenses.

 

Low light or outdoors and bright?

- tried both with indoor lighting (at night) and indoor window light (day time)

 

Shutter speed?

- correct exposure shutter speed = 1/25sec (day time) and around 1/12 sec (night time)

- bad exposure is almost always (1/45sec) and shutter had a different sound

 

Are you metering and then setting the shutter/aperture?

- yes, I metered and received exposure conformation dot on the top right-hand corner of the viewfinder.

 

I am sending you a PM.

Wait 10 seconds and reply if you wish.

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arthury

arthury

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Interesting ... I just tried outdoors lighting (very overcast)

 

- wide-opened

- good exposure 1/750sec

- waited 20 secs, re-focused and released shutter

- bad exposure 1/500 sec (overexposed!)

-- 5secs image review followed

-- shutter sounded like it resets only after a few seconds (unlike the behavior of the good exposure case, which resets right after the shutter was released)

Edited by arthury
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arthury

arthury

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Sorry, I never saw this and I just followed your post and get identically exposed images….Cannot replicate.

Off to the Mothership I fear.

 

That'll be like 2.5 months not seeing the camera again?

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simplygood

simplygood

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Posted

My 3 week old M 240 does the same thing. I didn't notice it until I updated to the newest firmware.

 

I took it to the shop ready to return it with 2 days left on my 2 week grace period. After fiddling with the camera...reformatting, resetting and taking the battery out and back it, they couldn't reproduce it. But it reverted back to the bad behavior a couple days later. I assuming its a firmware problem and will take care of itself. In the mean time I will either shoot using the rangefinder or shoot twice when necessary when using LV/EVF.

 

I don't think I'll send the camera back for this unless it proves to be a hardware problem.

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arthury

arthury

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To reproduce the issue more reliably, one need to shoot a few times to get the sensor to warm up. I was not able to reproduce the issue at will this morning when I started it up but after several shots, I can reliably reproduce the issue yet again following the steps I listed above in the OP.

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arthury

arthury

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My 3 week old M 240 does the same thing. I didn't notice it until I updated to the newest firmware.

 

I took it to the shop ready to return it with 2 days left on my 2 week grace period. After fiddling with the camera...reformatting, resetting and taking the battery out and back it, they couldn't reproduce it. But it reverted back to the bad behavior a couple days later. I assuming its a firmware problem and will take care of itself. In the mean time I will either shoot using the rangefinder or shoot twice when necessary when using LV/EVF.

 

I don't think I'll send the camera back for this unless it proves to be a hardware problem.

 

Could you reproduce the issue using LiveView as well (not just EVF) ?

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arthury

arthury

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Yes, it definitely happened with both LV and EVF.

 

Thanks for the confirmation.

 

One other thing: when it underexposed, were the shutter speeds fixed at 1/45 sec for indoor available light?

Edited by arthury
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