Auto ISO Failure with Firmware 3.1

[Bobster]

Advertisement (gone after registration)

Since updating to firmware 3.1 for the Leica CL the auto ISO function has failed.  There is provision to set both a maximum ISO and a minimum shutter speed. The new firmware will honor the former but fails to impose the minimum shutter speed.  For example, I have a user setting for telephoto that I use when I have the 55mm-135mm lens on the CL.  I have it set to a minimum of 1/125 sec so that the long lens has less chance to blur the shot.  The camera no longer recognizes the limitation and will attempt pictures at significantly slower shutter speeds.  Have others experienced this?

[nicci78]

Just as advertised in FW 3.1 the CL will honour «exact» exposure instead of maintaining minimum shutter speed. 

Previously you get a severely underexposed photo. Now you get a properly exposed but blurry photos. 

No good solutions here. APO 55-135mm is just too slow at f/3.5-4.5 for indoor use. Without tripod or IS or flash. 

[Bobster]

So, what you're saying is that the phrase "minimum shutter speed" has lost its meaning.  It no longer is the minimum if the software thinks another slower speed will produce a better picture. I'm the creator of the image and I should be the judge of that.  The firmware apparently has eliminated  minimum shutter speed from the auto ISO setting while keeping the illusion of the setting.  BS

[danielfrimley]

Leica's implementation of Auto ISO confused me even before the new firmware - Godfrey (@ramarren) outlined it really well here. If you search the whole forum looking for titles with "Auto ISO" in you'll find this isn't limited to the CL.

Hard limits work for me, they don't work for everyone. @nicci78 sums it up nicely above - it is what it is, try to allow for the inconsistencies in your workflow or don't use the feature.

[lct]

Questionable feature indeed but there is one solution: Auto Iso in Manual Mode. You set yourself the shutter speed you prefer this way. It's a mode i'm using on all my digital cameras but i use mainly manual lenses on them so i'm not sure i can advise it to people using L lenses on the CL.

[jaapv]

5 hours ago, Bobster said:

So, what you're saying is that the phrase "minimum shutter speed" has lost its meaning.  It no longer is the minimum if the software thinks another slower speed will produce a better picture. I'm the creator of the image and I should be the judge of that.  The firmware apparently has eliminated  minimum shutter speed from the auto ISO setting while keeping the illusion of the setting.  BS

If you are using auto-ISO, you have handed over the exposure part of your creativity to the camera anyway.As LCT says, the full-control mode on any camera is "manual"

[lct]

Advertisement (gone after registration)

 

33 minutes ago, jaapv said:

If you are using auto-ISO, you have handed over the exposure part of your creativity to the camera anyway.As LCT says, the full-control mode on any camera is "manual"

+1 but iso settings remain automatic with Auto Iso in Manual mode. It's just that we can choose both apertures and shutter speeds this way, which is very easy with the top dials of the digital CL. A new kind of AE we could not dream about in the film days. Worth a try IMHO.

[jaapv]

Of course; Auto ISO should be disabled in full manual mode. The present setting is practical for shooting in changing light with fixed exposure settings. 

[ramarren]

Pentax on some of their cameras provides a discrete setting for what Leica achieves with AutoISO in Manual exposure mode. They call it TAv mode ... lock the exposure settings but allow sensitivity to vary between set boundaries. 

Full manual exposure mode on Leica cameras involves also disabling AutoISO when you switch to M mode. Once understood, it's simple to use full manual exposure or Leica's means of "TAv" ...