Increasing Iso for a better image ?

I

ivanouchkine

Member
Hello !

Some of you mentioned that increasing the ISO on the GH13 does give a better image... Please, if somebody remember where was that discussion, could he give me the link ? (there are so many news that one gets lost...)

Thanks !
 
i remember someone mentioning 320 giving better results over 100. possibly to do with native iso? cant remember link only posts
 
To add to that, someone mentioned being able to set non-standard ISOs? Like 1250? How is that possible?
 
IIRC ISO settings less than 200 or so appear to apply some sort of negative analogue gain which gives images 'less clean' than 320-500ish (empirically the sweet spot).

1250 is very much a standard ISO. Make sure you're displaying 1/3-stop increments (in menus somewhere) in order to access these. 800 -> 1000 -> 1250 -> 1600 = one stop range in 1/3 stop increments.
 
dracore said:
To add to that, someone mentioned being able to set non-standard ISOs? Like 1250? How is that possible?
Click to expand...

Switch to SCN > Second icon from the top ( little camera icon ) then go down the menu till you see ISO INCREMENTS > then switch it to 1/3 EV. Then head back to movie mode.
 
Let's not forget what has been learned about ISO in DSLRs from Panasonic to Nikon to Canon, which is to avoid the following ones: 250, 500, 1000.
These ISO's actually add a DIGITAL gain and not an analog gain, and are therefore noisier than the next higher ISO. For instance, 640 is actually cleaner than 500.
This has been discussed in other threads and documented on more than one photography blog.
The gist is that the "native" ISOs are 100, 200, 400, 800, 1600 and these are created in hardware via an ANALOG gain process.
The 1/3-stop additional ISOs use DIGITAL adjustments. But there are good ones and bad ones. The "good" ones apply digital gain reduction to make a lower ISO...thus creating a less noisy image. These are 125, 160, 320, 640, 1250. But the "bad" ones use digital gain to boost the signal to a higher ISO, thus creating a noisy image with less dynamic range. Again, these are 250, 500, and 1000 (and 2500 when shooting stills).
 
Are you sure 125 was apart of the low noise ISOs? I thought they boosted from 100 to get 125 and not lowered from 200 to get 125.
 
PhilJackson said:
Are you sure 125 was apart of the low noise ISOs? I thought they boosted from 100 to get 125 and not lowered from 200 to get 125.
Click to expand...

I'm not sure. It sounds logical that they boosted 100 to get 125. In which case it would be considered one of the "bad" ISOs, though 125 is so low that personally I feel the negative effects would hardly be noticed. Also, I have a dim memory of a photography test showing that 100, 125 and 160 may have all been analog on some cameras. There's a lot of information and misinformation out there. I don't remember. Thanks for pointing that out, though.
 
Okay officially now confused, I had always just stayed at ISO 100 and I've been happy with the results-is it OFFICIAL that ISO 400 is closer to an all-around sweet-spot?
 
BrianBrook said:
Okay officially now confused, I had always just stayed at ISO 100 and I've been happy with the results-is it OFFICIAL that ISO 400 is closer to an all-around sweet-spot?
Click to expand...

It's probably worth doing tests for yourself on your own camera, because occasionally there are variations.

I've been testing mine tonight with various ISO settings (100, 160, 200, 320, 400, 640, 800, 1250, 1600) and they seem to have noise incrementing with the ISO numbers as expected. There is nothing there that frightens me though, and a little touch of "Neat Video" fixes it nicely. Here is an example of ISO 800 with and without Neat Video noise reduction. It may look like there is some posterization in the top left, but that is actually different lighting behind my monitor (on my desk) and that's just how it's being rendered OOF.

GH13_AVCHD.png

GH13_AVCHD_NV.png
 
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I was wondering where the hell the menu setting for this was.. thanks! Still a little confused will try to remember no 250.. 500. 1000....
 
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