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Canon R6 + RF 100-500mm = Moire


I'm having trouble photographing birds with my Canon R6 and the RF 100-500mm lens I just bought. A lot of moire is appearing on the bird's wing feathers. I've already done tests with apertures 7.1,8,9,10,11,13 and 14 and in all of them the moire remains the same. Below I will leave a link with images showing the moire and RAW files of these images. If anyone can tell me why this is happening and how to solve it I would greatly appreciate it.



Did you deliberately over sharpen the PNG examples?


I did not understand your question.

@rascher wrote:

I did not understand your question.

Sometimes people over sharpen an image to show/exaggerate the effects of Moiré for others to see. Your PNG screenshots from PS appear to be over sharpened or heavily edited in some way.

Your PNG 300% screenshot from PS (left)... My screenshot from your Raw in DPP at 300% (right).

foto 11 -falha DPP Compare.jpg


No photos have been edited for better quality. I want to know why this happened to my photos and how to solve it, so that the photos no longer look moire

Moiré is usually caused by an interference phenomenon created by a repetitive pattern of a certain size relative to the photosites it covers in a sensor and/or when that image is displayed.

I have avoided moiré by changing the distance to the subject, and/or the level of magnification when shooting. Also, as I alluded to, moiré can appear as an artifact when simply viewing the image at a certain magnification level - in this case the interference could be associated with the display configuration and resolution.  The R6 has an anti-aliasing filter built-in according to my sources, so the methods I describe seem to be the best solution.

cheers, TREVOR

"The Amount of Misery expands to fill the space available"
"All the variety, all the charm, all the beauty of life is made up of light and shadow", Leo Tolstoy;
"Skill in photography is acquired by practice and not by purchase" Percy W. Harris



I think PS is applying some type of correction.  Maybe unintentionally.  Notice Newton's comparison.  Your image in DPP looks much better. In your photo above animal eye tracking is locked.


You have good exposure.


WB is good.  Your ISO seems higher than necessary.


Here is a shot from my RF 100-500 with a similar level of feather detail.  This was shot on a R5 C.   

RF 100-500.  400mm, 1/500, f7.1, ISO 1000RF 100-500. 400mm, 1/500, f7.1, ISO 1000

Bay Area - CA

~R5 C ( ~RF Trinity, ~RF 100 Macro, ~RF 100~400, ~RF 100~500, +RF 1.4x TC, +Canon Control Ring, BG-R10, 430EX III-RT ~DxO PhotoLab Elite ~DaVinci Resolve ~Windows11 Pro ~ImageClass MF644Cdw/MF656Cdw ~Pixel 8
~CarePaks Are Worth It

Did you see the gray bird in the link I sent? This bird has a very aggressive moire. In birds of other colors, such as red, for example, moire does not appear. So there is no problem with my Canon R6 and the RF 100-500mm Lens? If I use a TC 1.4x does the moire disappear?


The presence of moire is also dependent on what you process the RAW images with.

Canon DPP does a good job with dealing with the moire.

Adobe Lightroom / Photoshop ACR does not do a good job without extra work.

I have shot some fabrics with an EOS R6 and RF 85mm F2 Macro IS STM lens, and in Lightroom they show as terrible moire results, but nothing in DPP. Moire processing is quite intensive and one way to speed up raw conversion, Canon does the moire processing at the expense of speed in DPP. Personally I think it's something that the EOS R6 shows up more than even the EOS R6 Mark II, it must be something about the physical size of it's pixels.

EOS specialist trainer, photographer and author

I can't use Canon DPP because I use denoise and sharpen with Topaz Photo AI and to use Topaz efficiently I absolutely need to use the raw RAW file. If I use DPP I will lose the RAW file because DPP will generate another format and this other format will not work well in Topaz Photo AI.