Author Topic: Understanding ISO  (Read 6132 times)

Ash McKenzie

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Understanding ISO
« on: July 24, 2012, 02:55:24 AM »
Hey Everyone,

I like to think I came from the mailing list community with a reasonably good understanding of the feature set as it has evolved with ML,  One thing I never quite got my head around (using nightlys all the time for production probably not the best idea but really who can deine the sweetness of these feautres) is the tweakableity of the ISO menu, now that we are at 2.3

Has anyone done any full on tests about ISO analog and digital?
Has the HTP been improved (lower noise etc)?
Is there lower noise on the NON 160 multiples now ?

Is there a clearer breakdown of the positives and negitives of Analog and digital Gain/ISO?



he56ys5ysu7w4

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Re: Understanding ISO
« Reply #1 on: July 24, 2012, 07:45:12 AM »
Found this article in the wiki. It might be helpful.
http://magiclantern.wikia.com/wiki/ISO
Amateur shooting family stills and video
Gear: Canon 600D/T3i -- Sigma 30/f1.4 EX DC HSM -- Canon EF-S 15-85/f3.5-5.6 IS USM -- Canon EF 50/1.8 II -- V3 LCD Viewfinder loupe -- Velbon RUP-L40
Editing with LR3 and FCPX

hotstreet

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Re: Understanding ISO
« Reply #2 on: July 24, 2012, 09:39:04 AM »
 ;)

Ash McKenzie

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Re: Understanding ISO
« Reply #3 on: July 24, 2012, 01:09:44 PM »
 :-[ Thanks

he56ys5ysu7w4

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Re: Understanding ISO
« Reply #4 on: July 24, 2012, 08:49:07 PM »
Hey Ash.
Here's some good info on analog/digital ISO.
Amateur shooting family stills and video
Gear: Canon 600D/T3i -- Sigma 30/f1.4 EX DC HSM -- Canon EF-S 15-85/f3.5-5.6 IS USM -- Canon EF 50/1.8 II -- V3 LCD Viewfinder loupe -- Velbon RUP-L40
Editing with LR3 and FCPX

SuperHans28

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Re: Understanding ISO
« Reply #5 on: July 27, 2012, 11:43:12 AM »
I've had a quick look at the ML ISOs and I can't say I see any difference? (apart from brightness of the 800 over the 700)

ML 700 ISO (800 with -0.3ev ML) - http://farm8.staticflickr.com/7248/7652727356_c1e416bb43_h.jpg
Canon 700 ISO (800 with -0.3ev Canon) - http://farm9.staticflickr.com/8017/7652723946_f8b0c6ff22_h.jpg
Canon 800 ISO - http://farm8.staticflickr.com/7274/7652720492_07ecc4670a_h.jpg

reddono

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Re: Understanding ISO
« Reply #6 on: July 29, 2012, 03:18:07 AM »
i dont see any difference...

1%

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Re: Understanding ISO
« Reply #7 on: July 29, 2012, 03:29:51 AM »
Well raw is raw.... but remember in video we don't get raw..

SuperHans28

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Re: Understanding ISO
« Reply #8 on: July 30, 2012, 11:46:24 PM »
Those stills aren't raw, they are taken from a video file.

Francis

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Re: Understanding ISO
« Reply #9 on: July 31, 2012, 12:12:21 AM »
The main benefit found in the initial testing of the ML ISO expansion was detail retention in the highlights. Try testing a scene that has complete dynamic range with some blown highlights. Used in small increments, like -0.3EV I remember being able to see clear differences between for example 640ISO via both 800 analog with -.3EV ML and -0.3EV Digital and seeing more details via the ML ISO adjustment.

Look to this google discussion for a couple of examples attached to the first post, when some of the testing began. It is subtle but definitely visible. As to all around improved image quality, I don't know if there is any substantial difference.