Exif data in Aperture missing f number

[jasoniburn]

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Box unpacked and straight out with my brand new (to me) M9P and 50mm Summarit lens today. Love the images I've taken but I have a question.

I use Apples Aperture software and in my EXIF data the lens shows as a 50mm focal length but none of my images have the aperture f stop number registered. 

Any settings I can change in camera or is that just how it is?

[jasoniburn]

Found out the answer myself 🙂

It's because there is no actual electronic reading that the lens sends to the camera as the lenses as we know are all mechanical. There can be some "guessed" f/ readings

interpreted by some software but they are not actual accurate aperture numbers. 

[pico]

15 minutes ago, jasoniburn said:

Found out the answer myself 🙂

It's because there is no actual electronic reading that the lens sends to the camera as the lenses as we know are all mechanical. There can be some "guessed" f/ readings

interpreted by some software but they are not actual accurate aperture numbers. 

We become accustomed to it. I'm not a savant but I remember the aperture of most pictures of the last forty years largely because I had four commonly used.  You may experience the same. Sometimes automation discourages our talent for recall.

 

 

Edited June 1, 2019 by pico

[vxx]

On 6/2/2019 at 3:52 AM, jasoniburn said:

Found out the answer myself 🙂

It's because there is no actual electronic reading that the lens sends to the camera as the lenses as we know are all mechanical. There can be some "guessed" f/ readings

interpreted by some software but they are not actual accurate aperture numbers. 

Hi, Apple's Aperture (I assume is end product) do not show the F number on exif. However your M9, as with all other digital M bodies, have a sensor on top of the top case to guess the light metering and generate a guess f stop number as you mentioned. Try adobe lightroom for reading the f stop data on exif which works fairly well.