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Unread 19th March 2012
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Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

As we know, the Olympus E-5 has a low strength anti-aliasing filter in front of its sensor while the E-30, with the same sensor, has a relatively strong AA filter.

I had an excuse to compare the two over at DPNow where I was responding to a prospective Nikon D800 owner who was getting confused by Nikon technical advice concerning diffraction limiting and the presence or absence of an anti-aliasing filter.

Basically, I produced a set of comparison shots using an E-30 and an E-5 to see if it was possible to detect a difference in the diffraction limit between same-resolution sensors with different antia-aliasing filter strengths.

You can read the article here:

http://dpnow.com/forum2/blog.php?b=305

Let me know what you think!

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Unread 19th March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

I think that the E-5 is much better than the E-30. It's stunning how much sharper the E-5 images are. At f/8, I don't see significant degradation from either camera. At f/11, both images are significantly less sharp than at f/8; the E-5 image still looks sharper to me. I would say the same about f/16 and f/22--each camera sees significant degradation in sharpness, but the E-5 fares better than the E-30. So based on this test, performed at 1-stop intervals, the diffraction limit of both cameras appears the same, and the one that is sharper at large apertures retains its edge even when some sharpness is lost to diffraction.

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Unread 19th March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

I see a difference in the amount of light in the f8/E30 and f8/E5 for instance (the E30 is lighter), which surprises me and a considerable difference in whitebalance.
The differences in sharpness are considerable smaller when diffraction starts setting in. At f8 there is a distinct difference between E5 and E30, the difference is slightly less distict at f11. At f16 the difference is considerably less and very small at f22. The E30 with the stronger aa filter seems to "catch up" with the E5 from f11 to f22.
I think this means that the less strong aa filter causes stronger diffraction effects.
At least that is what I think i'm seeing....
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Unread 19th March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

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Originally Posted by Kees View Post
I see a difference in the amount of light in the f8/E30 and f8/E5 for instance (the E30 is lighter), which surprises me and a considerable difference in whitebalance.
The differences in sharpness are considerable smaller when diffraction starts setting in. At f8 there is a distinct difference between E5 and E30, the difference is slightly less distict at f11. At f16 the difference is considerably less and very small at f22. The E30 with the stronger aa filter seems to "catch up" with the E5 from f11 to f22.
I think this means that the less strong aa filter causes stronger diffraction effects.
At least that is what I think i'm seeing....
I should explain that the light was fluctuating at times and I was using both a 2 second timer delay and 4 seconds 'Anti-shock' so although I pressed the shutter release when the sun was at its brightest, a couple of frames were recorded when a cloud slightly reduced the brightness a few seconds later. These are all from RAW files so the white balance and colour would be more of a function of the base settings in Lightroom.

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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

The tests show the E30 to be softer than the E5 but whether diffraction occurs sooner is hard to say.
What I found most interesting is how the sharpness reduced as the aperture got smaller, even from f4 to f5.6 there was a detectable decrease (I'm only comparing the E5 shots) at f8 very noticeable and f11 significantly so.

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Unread 20th March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

Diffraction? I can't tell because the E-5 images are so much sharper all around. xD
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Unread 20th March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

Quote:
Originally Posted by Ian View Post
I should explain that the light was fluctuating at times and I was using both a 2 second timer delay and 4 seconds 'Anti-shock' so although I pressed the shutter release when the sun was at its brightest, a couple of frames were recorded when a cloud slightly reduced the brightness a few seconds later. These are all from RAW files so the white balance and colour would be more of a function of the base settings in Lightroom.

Ian
Ian,

at the time the E-30 and E-620 were new, dpreview was complaining badly that the Adobe RAW converter wasn't working well with files from these. See e.g. http://www.dpreview.com/reviews/olympuse620/13 . Don't know whether this is still there for these bodies in later releases of the Adobe RAW converter or got rectified for the E-5.

It might be an idea to try another RAW converter as well and see what it does to the files/conclusions.

Greetings
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Unread 21st March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

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Originally Posted by joachim View Post
Ian,

at the time the E-30 and E-620 were new, dpreview was complaining badly that the Adobe RAW converter wasn't working well with files from these. See e.g. http://www.dpreview.com/reviews/olympuse620/13 . Don't know whether this is still there for these bodies in later releases of the Adobe RAW converter or got rectified for the E-5.

It might be an idea to try another RAW converter as well and see what it does to the files/conclusions.

Greetings
Joachim
Lightroom 3 made a significant step forwards, so I'm happy with that. Is there any sustained dissatisfaction since LR3?

Ian
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Unread 21st March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

Quote:
Originally Posted by Ian View Post
Lightroom 3 made a significant step forwards, so I'm happy with that. Is there any sustained dissatisfaction since LR3?

Ian
Only from E-30 and E-620 owners who don't like the E-5 being sharper.
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Unread 21st March 2012
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Re: Comparing resolution between low and high strength anti-aliasing (E-5 vs E-30)

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Originally Posted by David M View Post
Only from E-30 and E-620 owners who don't like the E-5 being sharper.
Very droll, David But seriously - I know some prefer Capture One or other RAW converters, but I personally feel the dodgy RAW conversion quality of Adobe Camera RAW is well and truly in the past.

Ian
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