Does Auto ISO's Auto Shutter Speed Limit require a chipped lens or adapter?

[hdmesa]

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I'm using the SL3 at the moment exclusively with adapted lenses using dumb adapters, but currently I can only set the Auto ISO shutter speed limit manually, where it works as expected. But if I try to use the auto setting for the shutter speed limit, it simply doesn't work – Auto ISO will not raise the ISO no matter how dark the scene gets, it simply keeps lowering the shutter speed.

To allow the auto shutter speed limit to work, is a chipped lens or adapter (Leica M-Adapter-L) required? If so, why? The camera knows the focal length based on what I entered (or based on the manual lens profile I selected) for the adapted lens, so it should have no problem doing the math to use the auto setting.

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[Photoworks]

the SL3 needs to know the lens to activate IBIS.

The adapter should not make a difference in the ISO setting.

I can use the R lens and set Auto ISO, F 2, and 1/125. In P or S mode, the ISO changes regardless of whether using Lens Profile ON or OFF

if you limit AUTO ISO TO 6400 and shutter time to 1/125 it will maintain the 1/125 until you are starting to underexpose and already hit 6400 ISO. 
In this case, the shutter time will go down to compensate for correct exposure. 1/30, 1/15, and so on.

[SrMi]

13 hours ago, hdmesa said:

I'm using the SL3 at the moment exclusively with adapted lenses using dumb adapters, but currently I can only set the Auto ISO shutter speed limit manually, where it works as expected. But if I try to use the auto setting for the shutter speed limit, it simply doesn't work – Auto ISO will not raise the ISO no matter how dark the scene gets, it simply keeps lowering the shutter speed.

To allow the auto shutter speed limit to work, is a chipped lens or adapter (Leica M-Adapter-L) required? If so, why? The camera knows the focal length based on what I entered (or based on the manual lens profile I selected) for the adapted lens, so it should have no problem doing the math to use the auto setting.

I can confirm the strange behavior: ISO is stuck when the Auto shutter speed is selected using a dumb adapter. Looks like a bug to me.

On the other hand, I find Leica's implementation of auto shutter speed not helpful. The selected shutter speed is either too high for static scenes (IBIS on) or too slow for moving objects. I wish Leica would implement a slider for auto shutter speed (Slowest to fastest), as it does for other cameras.

I always set the ISO min shutter speed manually (assigned to a button), but it gets a bit complicated for zooms.

[hdmesa]

30 minutes ago, SrMi said:

I can confirm the strange behavior: ISO is stuck when the Auto shutter speed is selected using a dumb adapter. Looks like a bug to me.

On the other hand, I find Leica's implementation of auto shutter speed not helpful. The selected shutter speed is either too high for static scenes (IBIS on) or too slow for moving objects. I wish Leica would implement a slider for auto shutter speed (Slowest to fastest), as it does for other cameras.

I always set the ISO min shutter speed manually (assigned to a button), but it gets a bit complicated for zooms.

Thanks for the confirmation. I was worried it was user error on my part.

On the M11, the max shutter speed of course doesn't work unless an M lens profile is manually selected because the camera has no way to know the focal length otherwise. The M11 digital stabilization during live view can't work without the M lens profile for the same reason. IMO, the M11 needs a way to manually input a focal length for uncoded lenses.

But yeah, even if they fix this bug, we still need more control over how aggressive it is in maintaining shutter speed, either with formulas, a slider as you mentioned, or low/med/high options.

I'm going to email info [at] leica-camera.com and see if they agree this is a bug to pass on to the engineers. 

[hdmesa]

3 hours ago, Photoworks said:

the SL3 needs to know the lens to activate IBIS...

It only needs to know the lens focal length. The camera also needs to know the focal length to do any sort of automatic calculations for minimum shutter speed as it relates to Auto ISO.

3 hours ago, Photoworks said:

...The adapter should not make a difference in the ISO setting.

I can use the R lens and set Auto ISO, F 2, and 1/125. In P or S mode, the ISO changes regardless of whether using Lens Profile ON or OFF

if you limit AUTO ISO TO 6400 and shutter time to 1/125 it will maintain the 1/125 until you are starting to underexpose and already hit 6400 ISO. 
In this case, the shutter time will go down to compensate for correct exposure. 1/30, 1/15, and so on.

Auto ISO with Shutter Speed Limit set to Auto does not work with a dumb adapter regardless of whether I set the focal length or choose a manual lens profile (required because camera needs to know the focal length to do the math required for Auto). If Shutter Speed Limit is set manually to a fixed shutter speed using the slider, it works fine.

[Photoworks]

8 hours ago, hdmesa said:

It only needs to know the lens focal length. The camera also needs to know the focal length to do any sort of automatic calculations for minimum shutter speed as it relates to Auto ISO.

I had my auto ISO set to a minimum of 1/125. and it was working fine with lens profile on and off.  Maybe in a different setting it doesn't, I would have to try it.

[SrMi]

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Just now, Photoworks said:

I had my auto ISO set to a minimum of 1/125. and it was working fine with lens profile on and off.  Maybe in a different setting it doesn't, I would have to try it.

Yes, that is what we are saying. The issue is when you set the shutter speed to Auto instead of 1/125.

[hdmesa]

2 hours ago, Photoworks said:

I had my auto ISO set to a minimum of 1/125. and it was working fine with lens profile on and off.  Maybe in a different setting it doesn't, I would have to try it.

As @SrMi said —> change it from the fixed shutter speed by tapping the round “A” circle to the left of the slider to set it to Auto. That is supposed to vary the minimum shutter speed automatically based on the focal length of the adapted lens you manually set a focal length for, but alas, it doesn’t work. Auto ISO will stay at 100 and the shutter speed will get longer and longer the darker it gets until it maxes out.

[Photoworks]

10 hours ago, hdmesa said:

As @SrMi said —> change it from the fixed shutter speed by tapping the round “A” circle to the left of the slider to set it to Auto. That is supposed to vary the minimum shutter speed automatically based on the focal length of the adapted lens you manually set a focal length for, but alas, it doesn’t work. Auto ISO will stay at 100 and the shutter speed will get longer and longer the darker it gets until it maxes out.

yes, i think that was the same for older cameras too.

I set 250 on my M11. and since I use few adapted lenses on the SL3, I set it to 125

 

but to come back to your original question. Yes, you need the Leica adapter to get it to work and select the correct M lens.
Leica adapter: you can't just pick a 28mm, AUTO iso will not change, you have to select from R or M lenses from the list.

the other lens option is mostly for cinema, and only activates IBIS, and I think you will be doing manual exposure anyway.

3rd Party adapter: AUTO iso does not work in "A" mode, even if you select a comparable M lens.

I would suggest to get off "A" and use 1/125

[stam6882]

On 8/18/2024 at 1:40 AM, SrMi said:

I can confirm the strange behavior: ISO is stuck when the Auto shutter speed is selected using a dumb adapter. Looks like a bug to me.

On the other hand, I find Leica's implementation of auto shutter speed not helpful. The selected shutter speed is either too high for static scenes (IBIS on) or too slow for moving objects. I wish Leica would implement a slider for auto shutter speed (Slowest to fastest), as it does for other cameras.

I always set the ISO min shutter speed manually (assigned to a button), but it gets a bit complicated for zooms.

Absolutely correct and I only discovered this bug recently with my newly acquired SL2 and a Novoflex R adapter. The "Auto" shutter speed under Auto ISO does not work unless I specify an absolute shutter speed say 1/125.  The lens profile can be selected but the camera will not use this focal length to cap the shutter speed to 1/2f as in the M.

It's a bit annoying as I would like to use different max shutter speed for different manual lens in order to maintain lower ISO, e.g for 28mm I can do 1/60 while for 90mm, I want my shutter speed to be at 1/250 or faster. Now I have to change this parameter everytime I change my lens using the dumb adapter.

 

[Volumetrik]

There are some older topics like here : 

Where the poster restarted the camera a couple of times and it solved the issue. Have you tried this @stam6882?