Author Topic: ISO100,125,160,200 comparison on E-P1 (Read 1400 times)

tom-ep1 · « **on:** April 23, 2011, 01:04:31 PM »

I just made some pictures and magnified it to 400%. The iso you can still see in each frame on the title. Camera was set to M and shutter speed adjusted according to the display.

Flat 400%

Sky 400%

Em5 Pete · « **Reply #1 on:** April 23, 2011, 01:35:34 PM »

That's not bad at all. I found with my Panasonic G1, even at ISO 100 with sky's, (or large solid colors) that a little outside help in noise reduction helps. Just a light application though, to just smooth out the very tiny speckles in the solid blue sky's.

These are a tad better than my G1 at these ISO's, But, only marginally, I also set my in-camera NR to "-2" though, and deal with any noise latter in post if I need to.

tom-ep1 · « **Reply #2 on:** April 23, 2011, 02:41:22 PM »

Just wanted to show the difference because ISO200 seems to have higher DR than ISO100. Not sure about intermediate levels (125/160) though.

voyager · « **Reply #3 on:** April 23, 2011, 06:34:45 PM »

That's because the sensor has to digitally downgrade your ISO 100 photo as the base ISO on the E-P1 is 200.

popo · « **Reply #4 on:** April 24, 2011, 12:42:59 AM »

What Voyager said. ISO200 is the base for the sensor, so you don't actually gain in setting a lower level. It does use a longer exposure so you in theory reduce shadow noise at the loss of highlight headroom.

tom-ep1 · « **Reply #5 on:** April 24, 2011, 02:24:58 AM »

I wouldnt say that, because i can see little difference in noise between ISO100 and 200. But it seems not be worth to use ISO100.

tom-ep1 · « **Reply #6 on:** April 24, 2011, 08:46:45 AM »

I did some cheapo test, i fotographed an jpeg with a T4110 grey scale on my screen and i saw that the dynamic range seems to be the same in ISO100,125,160. So this i wanted to see if it makes sense to use ISO125 or 160, because dpreview didnt tested this and the result is "no".
Starting ISO 200 its getting a lot better, but the best result i had at ISO250. As you can see the text is a bit over brightened at ISO200, i think the dynamic performance should probably be the same compared to 250.

adash · « **Reply #7 on:** April 24, 2011, 08:59:34 AM »

Which is what in that photo?

tom-ep1 · « **Reply #8 on:** April 24, 2011, 09:06:20 AM »

100,160,200,250 from top to bottom

adash · « **Reply #9 on:** April 24, 2011, 09:08:42 AM »

Thanks for your effort in making these. 200 and 250 should indeed be equal in DR, as long as they are exposed equally.

ISO100,125,160,200 comparison on E-P1