Should I use the non-standard ISO Settings?

I

Indyreel

Well-known member
I have unlocked the non-standard ISO settings in the GH1, but am not sure if I should use them.

I know the standard ones 100, 200, 400 etc work well, but if I use the "inbetween" settings will this effect the image in any bad way, especially for a feature planned for the big screen?
 
You could just simply test it yourself. Only then will you truly know what the consequences are and whether they are acceptable to you or not.
 
ydgmdlu said:
You could just simply test it yourself. Only then will you truly know what the consequences are and whether they are acceptable to you or not.
Click to expand...

There's nothing simple about professionally testing the GH1 footage to assure that these "in between" settings will effect picture quality when projected onto a large movie screen. My question was directed to those who have already been there, done that, and to see if they recommend using these settings.
 
Hi Indyreel: Illya Friedman, who posts here frequently, is probably one of the few people in the world who has participated in film-out tests of GH1-acquired footage. Taking in consideration the results of their tests, he's posted detailed suggestions about camera settings and production techniques for getting good results for GH1 footage including for large-screen projection.

I don't recall him specifically discussing the GH1's "in-between" ISO settings (I may have missed it), but he does describe ISO settings which that production used as a result of their testing. In addition to his posts here, refer also to info on his website: www.hotrodcameras.com

See also the videos of the GH1-oriented presentation he gave to the Digital Cinema Society:
http://www.digitalcinemasociety.org/content.php?page=Lighting Workshop
 
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There is nothing inherently detrimental in using an "in-between" ISO versus a "real" ISO. The "regular" ISOs adjust light sensitivity in whole stops, which simply means if you go from, say, 100 to 200, or 200 to 400 ISO, you double the light sensitivity each time. The "in-between" ISO's simply go in increments of one-third stop.

The issue of quality going to the big screen in regards to ISO will have to do with added noise the higher you go in ISO number. Anything above 400 might start to exhibit noise, though I've shot stuff at 800 that looks pretty good.

So there is nothing to risk by shooting at, say, 250 or 320 ISO. Or at 125 or 160.
 
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