What is this?

[Olaf_ZG]

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With the m10m and summilux 50a. 1/3000 at 6.8, iso 160. The second image is 15s later, but now at 1/4000. I don’t get what this white cloud is…

Images sooc, and yes, I might need to clean the sensor.

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Edited February 24, 2024 by Olaf_ZG

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[RexGig0]

Interesting. Internal reflection, or flare? I would not rule-out an atmospheric effect on the sunlight. 

Now and then, my Summilux 50 ASPH will flare in a way that I have yet seen.

Edited February 24, 2024 by RexGig0

[Olaf_ZG]

1 minute ago, RexGig0 said:

Interesting. Internal reflection, or flare?

I don’t have an idea, it really looks like a cloud, but can’t believe it wasn’t there 15s later…

[RexGig0]

2 minutes ago, Olaf_ZG said:

I don’t have an idea, it really looks like a cloud, but can’t believe it wasn’t there 15s later…

As I indicated in my edit of my previous post, I cannot rule out an atmospheric phenomena. There is a visually apparent flat-topped shape, on the sunlight reflecting from the water.

[NigelG]

Looks like flare plus internal reflection (the dark band at the top) - see this post by adan.

 

 

[Olaf_ZG]

@RexGig0, @NigelG thanks. I thought about both options but can still not decide what it is. I have shot many images that day, and this one was the only one with this phenomenon.

[Pelu2010]

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It’s an keeper! 
very seldom 

and very precious 

 

[colint544]

14 hours ago, NigelG said:

Looks like flare plus internal reflection (the dark band at the top) - see this post by adan.

 

 

I would agree - this seems the most likely explanation.

[Bikie John]

Do you have a filter on the lens? That can cause funny effects like this.

And whether you do or not, these things will often only happen at very particular angles/positions - if you can see it on a live view image just twitch the camera slightly and watch it zoom around like crazy! So it doesn't surprise me that you saw it on one shot but not the next.

John

[Olaf_ZG]

@Bikie Johnno filter, and lv was not used, as I rarely use it.

[Bikie John]

16 hours ago, Olaf_ZG said:

@Bikie Johnno filter, and lv was not used, as I rarely use it.

I didn't mean to suggest that LV might cause the problem - just that using it might show vividly just how erratic and apparently random flare can be.

John

[pgk]

It looks like flare (ie unwanted light) probably as a result of light reflecting off one of the curved glass/air interfaces. You are shooting against the light with the light source (the sun) out of frame but over-illuminating the lens sufficiently to bounce excess light around inside it and eventally some of this has caused an unwanted reflection. Such flare can be precisely angle critical which is why it only shows in the first image.