Understanding ISO

[Ash McKenzie]

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]

Found this article in the wiki. It might be helpful.
http://magiclantern.wikia.com/wiki/ISO

[hotstreet]

 

[Ash McKenzie]

  Thanks

[he56ys5ysu7w4]

Hey Ash.
Here's some good info on analog/digital ISO.

[SuperHans28]

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]

i dont see any difference...

[1%]

Well raw is raw.... but remember in video we don't get raw..

[SuperHans28]

Those stills aren't raw, they are taken from a video file.

[Francis]

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.