F-Stop Used Not Correctly Shown in Lightroom

[bourne]

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I am using a 35/2 Summicron ASPH on my M10R and find that the f stop that I actually used when taking the photo is not being accurately registered in Lightroom when I am editing.  Is this a common problem?  Lightroom does recognize the lens that I am using, but the f-stops always seem to be off.

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[LocalHero1953]

This question has been asked ever since Leica launched a digital M.

The camera has no way of knowing what f stop has been used, so it makes a guess based on a comparison of the light reaching the sensor and a light reading taken from the sensor on the front of the camera (top left from the red dot). This guess is recorded in the EXIF - and is rarely accurate.

It's not a fault - just something inherent in a system that uses lenses with no electronic connection.

Edited December 3, 2022 by LocalHero1953

[wda]

1 hour ago, bourne said:

I am using a 35/2 Summicron ASPH on my M10R and find that the f stop that I actually used when taking the photo is not being accurately registered in Lightroom when I am editing.  Is this a common problem?  Lightroom does recognize the lens that I am using, but the f-stops always seem to be off.

How do you think it could be?

[mheine]

To me it's everytime two f-stops below the f-stop I actually used:

f1.4 --> f1 (Lightroom)
f2.8 --> f2 (Lightroom)

[a.noctilux]

2 minutes ago, mheine said:

To me it's everytime two f-stops below the f-stop I actually used:

f1.4 --> f1 (Lightroom)
f2.8 --> f2 (Lightroom)

A pencil and a notebook may be more accurate ?

Just joking 😉.

I used those decades old tricks but only for a short while, long ago.

...

Guessing from digital M is just that guesstimate.

[Huss]

1 hour ago, bourne said:

I am using a 35/2 Summicron ASPH on my M10R and find that the f stop that I actually used when taking the photo is not being accurately registered in Lightroom when I am editing.  Is this a common problem?  Lightroom does recognize the lens that I am using, but the f-stops always seem to be off.

LR recognizes the lens due to the 6bit coding on the lens mount. That bit of info is recorded on your exif info.  But that is the only thing that it recognizes because there is no other communication between the lens and the camera. No electronic contacts.

[mheine]

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vor 2 Minuten schrieb a.noctilux:

A pencil and a notebook may be more accurate ?

Just joking 😉.

I used those decades old tricks but only for a short while, long ago.

...

Guessing from digital M is just that guesstimate.

Naaa, somehow it's working for me. Because every time when I know I did use f1.4 it shows f1 in Lightroom. Same for different aperture values where I really know which one I used. 😃

[bourne]

Thank you for your responses. A small sacrifice for using the wonderful M system. 

[rramesh]

If I want beautiful images I use a Leica.

If I want accurate EXIF data including location, the ability to instantly share on social media, and other smart features, I use my iPhone.

[Jeff S]

17 hours ago, mheine said:

To me it's everytime two f-stops below the f-stop I actually used:

f1.4 --> f1 (Lightroom)
f2.8 --> f2 (Lightroom)

Those are one-stop differences.

Jeff

[mheine]

vor 17 Minuten schrieb Jeff S:

Those are one-stop differences.

Jeff

Thank you for correcting, I'm always confused by this!

[Jeff S]

12 minutes ago, mheine said:

Thank you for correcting, I'm always confused by this!

Well, you’re right at home with an M, as the EXIF data is often similarly confused.

Maybe this will help..

https://www.cambridgeincolour.com/tutorials/camera-exposure.htm

Or, just remember that there is typically a one stop difference between a Noctilux (f/1), a Summilux (f1.4), a Summicron (f/2), an Elmarit (f2.8) and an Elmar (f/4). 

Jeff

Edited December 4, 2022 by Jeff S

[M11 for me]

vor 19 Stunden schrieb mheine:

To me it's everytime two f-stops below the f-stop I actually used:

f1.4 --> f1 (Lightroom)
f2.8 --> f2 (Lightroom)

I do not want to correct you. But its NOT f2 etc. Its rather f/2 etc. There is a mathematical formula behind that whereas f is focal length. You certainly know about that. Otherwise please ask. That would then open a great discussion about mathematics 😇

[LocalHero1953]

34 minutes ago, M11 for me said:

I do not want to correct you.

ROTFLMAO🙄

[M11 for me]

vor 30 Minuten schrieb LocalHero1953:

ROTFLMAO🙄

For whoever needs help:

https://de.bab.la/woerterbuch/englisch-deutsch/rotflmao-rolling-on-the-floor-laughing-my-ass-off

Edited December 4, 2022 by M11 for me