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05-28-2016, 09:03 PM   #1
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How often do you use AA Filter Simulator?

I've upgraded from a K20D so I've never had a SR based AA simulator before. It seems pretty bad though? Major loss of resolution...

I took these two images a few seconds apart, one with AA off and one with AA on (set to type 1). These are 100% crops. This was from a few feet away, such that the left eye (appears on the screen on the right side) was the exact size of the center focus point, I focused on something in the background, then on the eye, then took the shot, changed AA setting, repeated process.

AA off:



AA on (type 1):



Is it supposed to be this big of a difference, or did my camera just mis-focus on the second picture?

How often do you use the AA filter?

05-28-2016, 09:16 PM - 1 Like   #2
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QuoteOriginally posted by seanix Quote
How often do you use the AA filter?
Never. Not once. The only reason to use it would be if you are shooting product photography or perhaps weddings where moire would cause an issue. Even there it can usually be cleaned up in Lightroom. FOr everyday shooting, forget it exists. It's there for when you have a problem, not to use regularly. IMHO anyway.
05-28-2016, 09:22 PM   #3
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Could be good for ugly people portraits?
05-28-2016, 10:13 PM   #4
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I don't have this capability, but in any event the loss of resolution seems way too high--suggest you repeat it.

BTW why did you refocus for each? Can't you set the focus and then do w/o and w/.

05-28-2016, 10:21 PM   #5
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QuoteOriginally posted by seanix Quote
I've upgraded from a K20D so I've never had a SR based AA simulator before. It seems pretty bad though? Major loss of resolution...

I took these two images a few seconds apart, one with AA off and one with AA on (set to type 1). These are 100% crops. This was from a few feet away, such that the left eye (appears on the screen on the right side) was the exact size of the center focus point, I focused on something in the background, then on the eye, then took the shot, changed AA setting, repeated process.

AA off:



AA on (type 1):



Is it supposed to be this big of a difference, or did my camera just mis-focus on the second picture?

How often do you use the AA filter?
Looks mis-focused. In any case, with the K-1 moire is extremely rare. Type 1 should suffice if you do see some

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05-28-2016, 11:33 PM   #6
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QuoteOriginally posted by seanix Quote
How often do you use AA Filter Simulator?
I used AA filter simulator twice in my life. Since then, I never used this feature again.

Did you manage to get some moiré patterns with the K1 ?
05-28-2016, 11:59 PM   #7
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That second image is mis-focused.

I never use the AA filter simulation and I've never seen a photo that would have been improved by using it.
05-29-2016, 01:44 AM   #8
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How often used? Not a single time in nearly two years of shooting my K-3. But then again, I don't do much (if any) fashion or product photography. It strikes me as a fairly specialist feature, particularly if you take a kind of generalist approach to photography.

That said, I still appreciate having it on board in case I should need it. It adds to the confidence that the K-3 will let me tackle just about anything, even such a specialist scenario, as long as I keep up with my photographic skill.

Another thing is whether I wouldn't try to work around a moire problem by varying my working distance without having to resort to AA simulation, in order to retain that nth degree of sharpness. Which is actually what I'd likely do.

05-29-2016, 03:48 AM   #9
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By misstake it turned on on my K-1 and all images that day got alittle soft. Now the feature is out of the short cuts.

No, I never use or used it on purpose.
05-29-2016, 06:56 AM   #10
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QuoteOriginally posted by jatrax Quote
Never. Not once. The only reason to use it would be if you are shooting product photography or perhaps weddings where moire would cause an issue.
Even then, unless the moire is *really* bad, it's generally only noticeable at large sizes. For how people view images, it's not obvious and most people don't even know to look for it. If you're doing fashion with people who *know* what it is, then yeah, it's something to worry about a lot more.

I've seen my share of moire, probably far more than most people on the forum here, simply because the girls I shoot wear all kinds of fabrics. Problem fabrics: spandex, especially, and synthetic blends. In fact, all synthetics are the most likely source. Silks, cottons, wool...these don't moire except under the rarest circumstances. The fibers are large enough that the camera can resolve them. Synthetics have much smaller fibers and thus cause the problems since moire occurs when you have a repeating pattern that is too fine for the sensor to resolve. Higher resolutions, like what the K-1 offers, make the risk a lot lower.
05-29-2016, 02:47 PM   #11
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Thanks everyone. I don't think I'll turn the AA filter on again. I tried it because I've never had the feature before so I wasn't sure how much of a difference it would make. Also because I am seeing a lot of CA with my FA* 31 and FA* 77 that I don't see on my K20D so I wasn't sure if that was because AA was off on the K-1 or whether it's just the K-1 is very unforgiving.
05-31-2016, 03:51 AM   #12
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All AA filters work by limiting the resolution of the incoming image. In order to get Moire the frequency of lines in the image has to exceed 1/2 the number of pixels on the sensor. Most lenses operate as an AA filter; they limit how many lines in the image reach the sensor. This is why the D810 Nikon is able to get by with no AA filter in the camera - at the 36 megapixel level very few lenses are capable of resolving enough lines on the sensor to cause Moire, and very few real world images have a repeating pattern of lines closely spaced enough to cause Moire in the first place.

Stated differently: the resolution of the lens has to exceed the theoretical 110 lp/mm resolution of the K-1 sensor for the possibility of Moire to even exist. There are very few real world lenses which have that much resolution.

If you had a 6 megapixel sensor with no AA filter and used a lens like the 24-70 f2.8 DFA on it then Moire would be a distinct possibility - since that lens resolution far exceeds the the theoretical resolution of a 6 mp sensor (42 lp/mm). This is why AA filters didn't start disappearing from digital cameras until the 16 mp level.

Last edited by HoustonBob; 05-31-2016 at 04:09 AM.
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