What the heck is happening in this photo?

[hellobrandonscott]

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The green/purple swirl situation on this guy's gray suit. SL2-S and APO 35. Never seen anything like this before or since. 

 

 

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Edited June 29, 2021 by hellobrandonscott

[erl]

It's a moire pattern, usually caused by digital sensors when photographing surfaces/fabrics with a fine pattern.  I think lighting also has a role to play. Others will shortly chime in with more explicit and technical explanations.

[Ba Erv]

43 minutes ago, hellobrandonscott said:

The green/purple swirl situation on this guy's gray suit. SL2-S and APO 35. Never seen anything like this before or since. 

 

 

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What lens is this…I want one.  SL or M?

Edited June 29, 2021 by Ba Erv

[beewee]

18 minutes ago, erl said:

It's a moire pattern, usually caused by digital sensors when photographing surfaces/fabrics with a fine pattern.  I think lighting also has a role to play. Others will shortly chime in with more explicit and technical explanations.

Yeah, it’s moire (i.e. aliasing). This is cause by lens being able to resolve the texture of the textiles beyond what the sensor resolution is capable of capturing. So the sensor is under sampling the high frequency detail causing it to alias. If you’re processing in Lightroom Classic, there should be an option to remove moire. Doesn’t seem like Lightroom in iPadOS have this feature.

To avoid this completely, you could:

1. Photograph things with less fine repeating textures like textiles, roof tiles/shingles, etc..
2. Use a less sharp lens
3. Upgrade your sensor to a higher resolution sensor

 

[frame-it]

 

2 hours ago, beewee said:

To avoid this completely, you could:

1. Photograph things with less fine repeating textures like textiles, roof tiles/shingles, etc..
2. Use a less sharp lens
3. Upgrade your sensor to a higher resolution sensor

 

OR the simple way :

in LR, just paint over that area with a soft brush and then decide how much moire  you wanna remove.

 

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[LocalHero1953]

1 hour ago, frame-it said:

 

 

OR the simple way :

in LR, just paint over that area with a soft brush and then decide how much moire  you wanna remove

 

+1

A simple solution. More practical than limiting your photography to roof shingles🙂

In technical terms it's an interference effect between the regular texture of fabric and the regular texture of pixels on a sensor. 

Edited June 29, 2021 by LocalHero1953

[hellobrandonscott]

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Oh awesome, OK cool. I didn't know what the effect was, but now that I do, yep, that LR slider did the trick. Thanks!

[hellobrandonscott]

12 hours ago, Ba Erv said:

What lens is this…I want one.  SL or M?

The SL APO 35 on an SL2-S

[beewee]

36 minutes ago, hellobrandonscott said:

The SL APO 35 on an SL2-S

Well there’s your problem. Let me dispose of that lens for you.  

[beewee]

10 hours ago, frame-it said:

 

 

OR the simple way :

in LR, just paint over that area with a soft brush and then decide how much moire  you wanna remove.

 

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!

 

 

I just noticed that in LR for iPadOS, the moire removal tool has been moved from the global edit sharpening pane to the local edit brush tool under the ‘Optics’ section. So it is still possible to remove moire but it has to be done by hand with the brush tool.

[Slender]

On 6/29/2021 at 4:35 PM, hellobrandonscott said:

Oh awesome, OK cool. I didn't know what the effect was, but now that I do, yep, that LR slider did the trick. Thanks!

You may never have because coming from Canon your cameras were "crippled" by design by the camera manufacturer adding a Low-Pass-Optical filter (OLPF)  in front of the sensor. Using such a sensor reduces the risk for this to happen in videos and photo, but it softens your image also.

Leica's strategy was always to let their lenses "shine" as much as possible. Nowadays if you ever see moiree it is easier to remove it than it used to be.

[Slender]

NB: For stills, that is -easy to remove-. In video it is still better to have an OLPF filter.

[frame-it]

On 7/2/2021 at 1:17 AM, Slender said:

coming from Canon your cameras were "crippled" by design by the camera manufacturer

Crippled? Really?

[Slender]

9 hours ago, frame-it said:

Crippled? Really?

Ok it's a bit harsh of a term, maybe 🤪

Technically; it's the lenses reputation that will suffer from OLPF's effect 😅 if you prefer... whereas a camera will no OLPF will be judged by some to show excessive moire.... pick your poison I guess.

My Leica M9 was exhibiting a lot of moire with some lenses in ideal conditions for moire to show up, or even on faraway landscape scenes, horse hair...etc... So yeah I had sharp pictures that were "beating" anything from the competition back then at equivalent settings, no doubt about that! And moire correction became better and easier on still images.

Some Cine cameras allow you to place or remove the OLPF at your own desire. Can't do this on small camera bodies for understandable reasons.

In defitive, for my use, my experience: I would feel limited in still image work (in "relatively" high resoltion) with a mandatory OLPF.... and conversely I feel the lack of OLPF on video-centric cameras can lead to issues far more difficult to deal with than a camera that offers it. The only (if I remember correctly) FF L-Mount body with an OLPF might be the video hero S1H.

[Jon Warwick]

It wouldn’t have been practical for this type of image where people might move etc, but for static shots where you can also use a tripod the multishot “high resolution” mode probably would also have prevented the moire from appearing in the first place.