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01-18-2016, 08:50 PM   #1
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Flash Exacerbate Moire?

So I had never seen moire with my K-5 IIs except in rare cases. I've since moved to off-camera flashes and wow...I see it a lot in my fashion/cosplay shoots now. It's become pretty common. Does the flash make this effect worse? I'm shooting at narrower apertures than before, about f/4 instead of < f/2.8 like I used to. I thought moire was supposed to decrease with smaller apertures. My photos are *a lot* sharper than they used to, of course, but the moire is become more and more common.

01-18-2016, 09:37 PM   #2
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If you use flash, it is likely that the images are sharper because flash seems to be able freeze motions. I also think that moire is more prominent in sharper images, in addition, when the image is shrink to small size, when it is full size on my screen it seems to tone down a bit.
01-18-2016, 10:43 PM   #3
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QuoteOriginally posted by MadMathMind Quote
I had never seen moire with my K-5 IIs except in rare cases. I've since moved to off-camera flashes and wow...I see it a lot in my fashion/cosplay shoots now.
welcome to one of the many challenges involved with studio photography! One of the major contributors to Moire is hard and contrasty lighting. Studio photographers like me don't just use big modifiers because the look cool - the softer shadows reduces contrast and and help reduce the impact of moire. The angle that you are photographing your subject also has a significant impact, straight on shots tend to reduce it rather than shooting on an angle.
01-19-2016, 08:21 AM   #4
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QuoteOriginally posted by MadMathMind Quote
Does the flash make this effect worse? I'm shooting at narrower apertures than before, about f/4 instead of < f/2.8 like I used to. I thought moire was supposed to decrease with smaller apertures.
As you head into diffraction land, sure. Going from f2.8 to f4 is moving into sharper land, which is where moire hangs out. Likewise for the possible extra motion freezing you're getting with the flash compared to ambient.

01-19-2016, 08:27 AM   #5
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Also if you are shooting a lot of clothing, you are bound to run into Moire once in a while flash or no flash.
01-21-2016, 05:57 AM   #6
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Thanks everyone! I don't like studios much so we do location shoots. My first time doing off camera flash had too much flash and not enough ambient, so I'm going to look more to f/2.8. That should help with moire just a bit because as good as the FA31 is, it's just plain ridiculous at f/4 and above.

QuoteOriginally posted by aleonx3 Quote
If you use flash, it is likely that the images are sharper because flash seems to be able freeze motions. I also think that moire is more prominent in sharper images, in addition, when the image is shrink to small size, when it is full size on my screen it seems to tone down a bit.
Sharper, yes. Unbelievably sharper, to the point where I finally learned what my equipment is capable of.

QuoteOriginally posted by Digitalis Quote
welcome to one of the many challenges involved with studio photography! One of the major contributors to Moire is hard and contrasty lighting. Studio photographers like me don't just use big modifiers because the look cool - the softer shadows reduces contrast and and help reduce the impact of moire. The angle that you are photographing your subject also has a significant impact, straight on shots tend to reduce it rather than shooting on an angle.
Just when I thought life was about to get easier!

QuoteOriginally posted by hjoseph7 Quote
Also if you are shooting a lot of clothing, you are bound to run into Moire once in a while flash or no flash.
I've seen it before, of course. Microfibers and spandex, which are incredibly common in my genre, cause the most problems. Satin is best for moire but the camera has a terrible time with the colors and texture. It really crushes it sometimes, especially if the dress is black or red.
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