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Old Sep 26, 2011, 7:35 PM   #11
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Default Results from E-30

Gidday AC & All

Quote:
Originally Posted by ac.smith View Post
I just ran a test of my e620 shot every available ISO setting from 100 to 3200. The tests were shot with noise filter off, f/3.2, 1/200, lens cap on. I'll post five photos per section and some thoughts in the last section. This section has 100, 125, 160, 200, and 250.

A. C.
I have used the same methodology with my E-30. JPEG size set to LF.

I have run the series three times with NF = OFF, NF = LOW and NF = STANDARD.

Examined the results 4 at a time with overlap using FastStone Viewer v4.6 on my calibrated ASUS ProArt wide gamut monitor at 100% in fully dark room at night.

My results concur with those that you have got with JPEGs.

A couple of additional observations:

With NF = STD (my default with the E-30), the intermediate stops are noisier from 400 to 800, but almost imperceptible elsewhere.

With NF = OFF

250 & 320 are noisier than either 200 or 400, which are about equal, to all intents and purposes - monitor limitations - would NEVER show in print; none of them ...

500 & 640 are noisier than 400 or 800, with 800 being slightly noisier than 400, but nearly equal to it; and 640 being noisier than 500 - quite noticeably so.

1000 is closer to 800 (pretty close, almost identical ... ), whereas 1250 is as noisy as 1600, with almost no difference between them. So if going to use 1250, may as well use 1600, IMHO.

1600 to 3200 is a fairly natural progression, but with 2500 being much closer to 3200, and 2000 being closer to 1600, but still noticeably noisier.

With NF = LOW, results are similar to those with NF = STANDARD.

HOWEVER, I also go against the received wisdom that one should have NF = OFF with the E-30. IME, this makes a good camera into a noisy camera.

Not so with E-1/510, both of which I have set to NF = OFF.

IMHO, I reckon that Olympus finally sorted out the NF with the E-30 so that the middle choices of OFF, LOW, STD, HIGH range are better than OFF or HIGH.

My qualified conclusions:

There is something funny in the woodshed.

With NF = OFF, 500 and 640 should be avoided at all costs. Better off shooting at 800 than either of them.

With NF = STANDARD, 500 is OK (nearly the same as 400), but 640 is still to be avoided at all costs - noisier than 800!

At the higher ISOs, noise progresses in an odd way, but still a progression, becoming noisier as ISO increases.

NF = LOW seems to be the best setting for the E-30, AFAICT. Try this setting first with an E-5, maybe?


STILL have to avoid 640 like the plague. 500 is not as clean as 400 or 800, but quite acceptable.


Like I said: something funny in the woodshed.


NF = OFF is not good.
NF = LOW or STANDARD is acceptable, but one needs to avoid certain ISOs with each (different ISOs ... ??).
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Olympus dSLR bodies: E-30, E-510, E-1
Digital lenses: f2.8/25 pancake, f2/50 macro, 7~14, 11~22; 14~42, 14~45, 14~54 MkII, 40~150 MkI, 40~150 MkII, 50~200 MkI; EC-14; EX-25
plus: FL-36R, Studio Strobes, Epson R3880, V700, Scan Elite 5400 II, lots of OM gear .
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Old Sep 27, 2011, 7:08 PM   #12
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G'day ac

What an amazing sequence -THANKS- for alerting me to it & its possibilities
While I grizzle about the noise from my FZ35 in lo-light, I had not considered doing what you have done ... I will give it a try & post some results [all being well]

Regards, Phil
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Old Sep 27, 2011, 7:51 PM   #13
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John: thanks very much for the additional information. You guys have put in a lot of research. Very informative and very useful.
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Old Sep 27, 2011, 8:59 PM   #14
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Default RE: Results from E-30

Gidday Steven

Quote:
Originally Posted by Steven R View Post
John: thanks very much for the additional information. You guys have put in a lot of research. Very informative and very useful.
Thanks, mate.

I hope to post a sequence of image crops as AC has done, but it might take a few days ... .

The test was certainly an eye-opener for me. Suggested by a friend with a link to AC's post here so that I could follow the same methodology.

What I think might be happening is that Olympus is using an analog gain control for the full ISO stops, then playing with the image digitally after the ADC stage for the "intermediate" ISO stops. This may account for the oddities that both AC and I have observed with the lower of the intermediate ISO being less noisy than the upper of the two between the full stops. Analogous to deliberately under-exposing, then lifting the shadows in post (have I got that right? I never do this kind of thing personally).

The test is extremely quick and simple to do using AC's method explained in his OP. The analysis is quite another matter ... .

If anyone is thinking of doing this test with any camera, ensure that dark frame subtraction for long exposures is turned OFF (NR or "Noise Reduction" for Olympus cameras).
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regards, john from Melbourne, Australia

Galleries: http://canopuscomputing.com.au/gallery2/v/main-page/

Olympus dSLR bodies: E-30, E-510, E-1
Digital lenses: f2.8/25 pancake, f2/50 macro, 7~14, 11~22; 14~42, 14~45, 14~54 MkII, 40~150 MkI, 40~150 MkII, 50~200 MkI; EC-14; EX-25
plus: FL-36R, Studio Strobes, Epson R3880, V700, Scan Elite 5400 II, lots of OM gear .
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Old Feb 21, 2013, 7:31 PM   #15
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Think we need to get AC's post as a sticky.. it's one of the best esp on the forum and it'd be good reminder as to which ISO settings not to use.
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Old Feb 26, 2013, 4:24 AM   #16
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agreed
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