a7rIV white spots?

[Steven Pratt]

Occasional white spots as per image. 1/2000 f4 Auto ISO. Not present on all images from same shoot. Sensor and lens clean.  Any ideas?

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

[Cameratose]

Does it do it with different lenses?

Have you checked the inside of the lens for fungus/dust using a strong light? 

Have you checked for dust/spots on the sensor by closing down to f/22 or so and shooting at a plain white paper or bright blue sky? 

Unlikely it's hot pixels, nonetheless, how long since you've performed pixel mapping? The camera usually does it by itself, but with some settings you need to do it manually. Maybe worth a try.  

Everything I've suggested would be more possible if it happened all the time. The fact that it doesn't suggests something is moving around. I think the first question is important. If it doesn't do it with any other lenses, then it's clearly the lens. 

 

[Steven Pratt]

Great response with numerous suggestions. Not seen with other lenses but I’ll follow recommendations and revert. Dust would be improbable given its internal focussing. 

[Cameratose]

You didn't mention which lens and since this site doesn't report exif I was wondering about that.

[Steven Pratt]

Sorry about that. I believe pixel refresh is done occasionally on switch off when the shutter fires and I’ve cleaned the sensor with Visible Dust and cleaned front lens element-I don’t use filters. More tests to come but it’s the inconsistency that’s puzzling. Thanks for responses so far - appreciated

[Cameratose]

3 hours ago, Steven Pratt said:

Sorry about that. I believe pixel refresh is done occasionally on switch off when the shutter fires 

Correct, but as previously stated, if you use certain setting combinations it negates the auto-mapping. They tell you in the manual to do it manually every so often, maybe even once a week if your setup has those settings. Can't recall exactly what they are, it's worth checking out though. 

[Steven Pratt]

Again thanks! I’ll proceed 👍👍

[Steven Pratt]

Can’t locate manual mapping in the manual? 

[Cameratose]

Weird, I can't find it in the R IV. This page is from the R V manual. That doesn't mean it's not there, Sony tends to change their terms from iteration to iteration. See if it shows up when you do this:

Welcome, dear visitor! As registered member you'd see an image here…

Simply register for free here – We are always happy to welcome new members!

[SonyFF32137]

I just went through the A7riva manual and it appears that it doesn't have the auto pixel mapping feature like my A7cr has

[Steven Pratt]

Looks like manual every 2-3 days by date change is the route to follow.  

[Cameratose]

Have you tried it to see if it helps?

[Steven Pratt]

Solved !! 👍👍mapping is the answer by moving date. 

[Cameratose]

Nice! It was a long shot, glad it worked out!

[Steven Pratt]

👍👍👍