5DSR - wedding dresses - no moire (pics inside)

Today I went to Becker's Bridal in Toronto with the 5DSR to see if moire was a problem on wedding dressing - my initial testing would say NO!

Speaking with the sales staff, the new popular dress seems to have a screen type material in front of the dress - a situation I thought perfect to create moire if it was going to happen - no is the answer.

I'm not ready to say that it can't happen, Canon has put the warning out there so if clearly can, and my testing on men's suits shows that it is more possible, but from what I shot today - no moire on wedding dresses.

The lighting in the store was brutal - kelvin was 2900 to 'fix' in LR.

All pictures shot with the 100-400II handheld in brutal light - fixed in LR as much as possible.

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Whether or not you will see moir is probably far more lens dependant than anything else. If the lens can deliver sufficient resolution to exceed the Nyquist cutoff frequency you will see moir, if it cannot deliver that level of resolution then you will not see any issues, regardless of the subject. There is also a significant difference in the Nyquist limit for grayscale luminance only images, and for images with strong colour. This is especially true for images that have a strong red or blue colour. Thanks to the design of the Bayer Colour Filter Array the full colour Nyquist frequency is actually half that of luminance only images.

If I really wanted to know how the camera is likely to handle moire, I would try it out with the absolute sharpest lens that you have, stopped down to it's "sweet spot" aperture wise. I would also try testing it on some blue fabric, well red would be OK too, but I guess you do not see too much red fabric at weddings. I think the fact that at least for the B&G at most weddings you are dealing with mostly white and grey/black is going to help you, as the levels in each channel should be about equal, so bringing your Nyquist frequency closer to the theoretical luminosity only value.

Alan

Alan,

I appreciate your response.

I posted some pictures already from a men's suit store - it was the first place I went after I picked up the camera - you can see the pictures here (https://photography-on-the.net …/showthread.php​?t=1432062).

In terms of the lens I used, I deliberately chose the Canon 100-400 II IS. After thoroughly testing it against my 70-200 F2.8 II, I believe it is every bit as sharp and even a hair sharper - and that is the lens that every wedding pro makes a living on. I also chose the 100-400 II as I believe it has the best IS of any lens canon makes and it would allow me to quickly take pictures in a bridal store without having to use a tripod. I chose settings based on what I would likely use if presented with similar lighting conditions - i.e. the trade off of acceptable ISO, F stop, shutter speed - thus most of the pictures were shot at F5.6, SS 1/100 - 1/200 and ISO below 1600 - would the pictures be sharper at F8 - possibly fractionally, there would be more DoF for sure, but the 100-400II at F5.6 is as sharp as any lens I know of so I think it is a good test of whether this camera can be used by wedding pros for bridal portraits - and I think that answer is an absolute yes.

Thanks for your post.

Paul.

Paul I think one of the biggest problems that we have with this is lack of suitable information on lenses. Most of the published data on lens resolution is based on on camera testing. What is really needed is testing on an optical test bench to know the actual maximum resolution the lens can deliver. If a lens can only deliver a maximum of 100 line pairs/mm then you are not going to ever have to worry about exceeding the Nyquist for the sensor, at least as far as luminance goes, although it could quite happily exceed the limits for colour. Of course this is based purely on the science/enginieering limits of analogue/digital conversions.

I have seen your results, and as far as wedding photography goes, I think they are very relavent, and seem to show very promising results. It seems as if these two new bodies might be very useful for a lot more than just use in the studio. I know I would love to try one with a 600mm f/4 for my aviation photography. Finally FF makes sense while being mostly focal length limited.

Alan