Caprock Anti-Moire Filters

[ydgmdlu]

Originally Posted by ustein

If you get moire how is your in camera sharpening set?

In-camera sharpening should have nothing to do with moire. Tests have shown that aliasing (and moire is a form of aliasing) doesn't change with sharpening. Moire is an artifact of the image scaling method that Canon's using. In-camera sharpening is still a kind of post-processing that can only enhance or worsen the appearance of the moire that's already there, not change the amount.

[ustein]

Thanks.

>can only enhance or worsen the appearance of the moire that's already there, not change the amount.

True. But the "only" can also mean that some people have the most issues also may use high contrast and sharpening.

Do we actually know how Canon samples the image? e.g. full image and then downsampled or only a partial readout?

[Barry_Green]

Canon says they use a pixel-binning technique, reading out groups of six.

[ustein]

>Canon says they use a pixel-binning technique, reading out groups of six.

Would make sense but also reduces the readout resolution.

[Barry_Green]

Well, yeah, that's the whole point. They can't possibly read out the entire chip, it's not designed for that. They have to bin it (or skip rows) to reduce the amount of the chip they're reading.

[Isaac_Brody]

My 2.0 came today. I don't have time right now to out and shoot buildings but just a quick test on this piece of fabric in my room that brings out the worst moire looked promising. It doesn't affect sharpness too much and moire is almost completely gone. The 2.0 doesn't completely kill it but you have to look for it to see it. Average viewer wouldn't notice it and of course a little postwork could get the rest of it. A 2 is the best tradeoff between elimination and sharpness.

EDIT: I tested these filters on a 7D, not a 5D. Your mileage may vary with a 5D.

[Sttratos]

It would be interesting to know just how much sharpness the 2.0 is knocking off.

[Anthonyb]

Originally Posted by Isaac_Brody

My 2.0 came today. I don't have time right now to out and shoot buildings but just a quick test on this piece of fabric in my room that brings out the worst moire looked promising. It doesn't affect sharpness too much and moire is almost completely gone. The 2.0 doesn't completely kill it but you have to look for it to see it. Average viewer wouldn't notice it and of course a little postwork could get the rest of it. A 2 is the best tradeoff between elimination and sharpness.

EDIT: I tested these filters on a 7D, not a 5D. Your mileage may vary with a 5D.

Thanks I'm going to get one shipped tomorrow.

[Anthonyb]

Originally Posted by Anthonyb

Thanks I'm going to get one shipped tomorrow.

Oh soo lame, I just read that they don't have 2.0 in the 4x4 filter variety. What gives? 67mm? What does that even fit? My canon lens is 58, and I know several lenses are 72, and 77.. but 67mm??? Bizarre. So I guess the only option is to get the 67mm and adapter.

What are you using Isaac?

[Isaac_Brody]

I'm using 67mm with step up rings. I'm using Contax zeiss so it's not a problem for me.

I wish the filter were larger, 72mm would have been more useful and less of a pain in the ass.