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M9 with SF24D TTL display question

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Hello,

I apologize if this has been answered somewhere before, but I searched the forum (and the web) and cannot seem to find my answer. I purchased a Leica SF24D about a year ago. On arrival, it worked flawlessly in TTL, A, M etc and overall I was pleased.

It has been a few months since I have used the flash and this past weekend when using the unit, it noticed that it exhibited some behavior that I do not recall existing before. When used in TTL (and with 6 bit coded Leica lenses ) I thought I remember that when changing the F-Stop on the lens, the flash would also show the corresponding f-stop with distance on the LCD display on the flash . When using the flash this past weekend, I noticed that when changing the F-Stop on my lens, the flash was fixed on an f-stop, say 2.4. When I changed my lens from 2.4 to 8, the flash remained on 2.4. Overall, the exposure actually looked correct so it appears that that the flash is working. As a test, I adjusted ISO on camera and the ISO did change on flash. I also changed sync speeds in camera, cleaned contacts on lens, replaced batteries in flash etc. I also manually adjusted flash f-stop when in TTL mode (set flash to F8, then lens to 2.4, 5.6, 8 etc) and the exposures continued to look accurate.

 

Am I just remembering the operation of this flash wrong? I thought the flash f-stop would show the corresponding f-stop on lens when in TTL?

 

As for A, that is working as expected, same as M.

 

Thanks for any insights.

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The flash cannot know the aperture, as it is not transmitted. There is a guesstimate by comparing light on the external lightmeter with the measurement of the camera but it is not very precise and will only set the approximate level for the (first) preflash.

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1 minute ago, jaapv said:

The flash cannot know the aperture, as it is not transmitted. There is a guesstimate by comparing light on the external lightmeter with the measurement of the camera but it is not very precise and will only set the approximate level for the (first) preflash.

Gotcha, so it is working fine, I am just remembering it wrong. That is what I thought, but I feel like I remember the flash showing me the corresponding f-stop. Thanks for the reply.

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On 2/5/2020 at 5:54 PM, jaapv said:

The flash cannot know the aperture, as it is not transmitted. There is a guesstimate by comparing light on the external lightmeter with the measurement of the camera but it is not very precise and will only set the approximate level for the (first) preflash.

I have bought SF24d for my M9 years ago but I didn't use it all. I have now SL, are they compatible? Sorry for this extra question in M topic🙂

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