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Author Topic: ISO25 on the May 15 2012 build  (Read 27964 times)

Chungdha

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ISO25 on the May 15 2012 build
« on: July 20, 2012, 09:20:31 PM »
So here is a simple guide showing how to change your ISO to ISO25 while normally ISO100 is the standard lowest ISO on most of the Camera's. It increases also a bit of the dynamic range plus also able to let you have more lower ISO range.

To download this Magic Lantern Build follow the link below:
http://t.co/UzlWYUvP
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Michael Zöller

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Re: ISO25 on the May 15 2012 build
« Reply #1 on: July 23, 2012, 01:06:42 AM »
Thanks for the vid!
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rednax

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Re: ISO25 on the May 15 2012 build
« Reply #2 on: July 23, 2012, 01:48:00 AM »
this features is on new firmware 2.3??
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KarateBrot

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Re: ISO25 on the May 15 2012 build
« Reply #3 on: July 23, 2012, 05:08:12 AM »
yes
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Matthew Kieren

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Re: ISO25 on the May 15 2012 build
« Reply #4 on: July 23, 2012, 07:41:21 AM »
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a1ex

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Re: ISO25 on the May 15 2012 build
« Reply #5 on: July 23, 2012, 07:47:26 AM »
That's a very rough draft - take it with a grain of salt.
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Chungdha

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Re: ISO25 on the May 15 2012 build
« Reply #6 on: July 23, 2012, 04:51:22 PM »
It works still in the new 2.3 version just still got the color shift to green but nothing that bit of color correction cant fix.
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screamer

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Re: ISO25 on the May 15 2012 build
« Reply #7 on: July 23, 2012, 10:59:36 PM »
All this iso things are really interesting, and the article is a pleasing and illuminating read.
But i want to ask a question. why the digital negative gain isn't available in photo mode? it's because you don't find useul or for some hardware/software limitations? because i think that decreasing the 100iso limit should be very interesting used like a "digital ND filter". I mean, lowest iso, increased time. So for long exposures should be interesting (i don't know how many stops this could be done, but could be useful)
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a1ex

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Re: ISO25 on the May 15 2012 build
« Reply #8 on: July 23, 2012, 11:01:16 PM »
In photo mode you can shoot RAW - which contains all the dynamic range you can get.
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hoiman417

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Re: ISO25 on the May 15 2012 build
« Reply #9 on: July 24, 2012, 05:30:10 AM »
Is it possible integrate this feature into auto ISO?

Or is there any better way to use ISO25 in light changing scenes?
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a1ex

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Re: ISO25 on the May 15 2012 build
« Reply #10 on: July 24, 2012, 07:44:30 AM »
No.

For light changing scenes, @3pointedit had the idea of using HDR video - take a look around.
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rednax

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Re: ISO25 on the May 15 2012 build
« Reply #11 on: July 24, 2012, 09:50:25 PM »
Quote from: screamer on July 23, 2012, 10:59:36 PM
because i think that decreasing the 100iso limit should be very interesting used like a "digital ND filter". I mean, lowest iso, increased time.

I think the same thing. I'd like to shoot at ISO 25. so I can increase exposure when the sun is up, as if I had a nd filter
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ClicketyClick

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Re: ISO25 on the May 15 2012 build
« Reply #12 on: July 24, 2012, 11:11:27 PM »
In the days of film ISO 25 would be giving the finest resolution. Does anything like his happen here that increases Image Quality? (for stills)
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screamer

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Re: ISO25 on the May 15 2012 build
« Reply #13 on: July 25, 2012, 03:10:00 AM »
ClicketyClick pointed out exactly the meaning of my question: is it possible to have lower iso than 100 (with conseguent less noise and better iq than the standard 100iso lowest value? but if i understood well, the answer is no, or better the lowest iso is a pull down of a more great value (160?)
And if it's true, is the image quality of 160iso the same of 100iso (i mean with raw shooting, the noise level is the same?)
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always trying to use the 100% of magic lantern..
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Canon 60D, all the samyang lenses, Canon 50 mm 1.4, Canon 60mm macro, Canon 70-300 usm, Sigma 4.5mm fisheye, Sigma 17-70 2.8, Canon 40mm f2.8 pancake, all the Lensbabies and a lot of other pieces, Flash metz 58 af2

a1ex

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Re: ISO25 on the May 15 2012 build
« Reply #14 on: July 25, 2012, 09:17:53 AM »
160 is pulled down from 200, so the RAW files shot with these two ISOs will be identical.

The lowest analog ISO is 100.
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ClicketyClick

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Re: ISO25 on the May 15 2012 build
« Reply #15 on: July 25, 2012, 11:55:26 PM »
so that's a "No"?
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SuperHans28

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Re: ISO25 on the May 15 2012 build
« Reply #16 on: July 26, 2012, 11:52:52 PM »
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
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Chungdha

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Re: ISO25 on the May 15 2012 build
« Reply #17 on: July 27, 2012, 06:29:27 PM »
rarely use iso700 though
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he56ys5ysu7w4

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Re: ISO25 on the May 15 2012 build
« Reply #18 on: July 27, 2012, 08:36:51 PM »
Quote from: SuperHans28 on July 26, 2012, 11:52:52 PM
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

Noticed the beer was full in pic one and empty in the net. ;-)
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nitin

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Re: ISO25 on the May 15 2012 build
« Reply #19 on: July 28, 2012, 09:18:21 PM »
Does this lower iso works with pics? I am new to magic lantern.
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scrax

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Re: ISO25 on the May 15 2012 build
« Reply #20 on: July 28, 2012, 09:49:40 PM »
Quote from: nitin on July 28, 2012, 09:18:21 PM
Does this lower iso works with pics? I am new to magic lantern.
No, you can have same result if you shoot in raw and underexpose in post.
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Rush

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Re: ISO25 on the May 15 2012 build
« Reply #21 on: August 09, 2012, 04:41:28 PM »
Quote from: Chungdha on July 20, 2012, 09:20:31 PM
So here is a simple guide showing how to change your ISO to ISO25 while normally ISO100 is the standard lowest ISO on most of the Camera's. It increases also a bit of the dynamic range plus also able to let you have more lower ISO range.
Are you sure? I think that the best dynamic range only possible with native ISO100.
I think that ISO25 is the ISO100 with cut of 2 stops of dynamic range. Is it wrong?
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KarateBrot

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Re: ISO25 on the May 15 2012 build
« Reply #22 on: August 09, 2012, 04:59:54 PM »
You really get more details in the highlights which are normally clipped. you can see that the whites are getting more pink. that's because not all colors clip at the same intensity and that's what ML uses as an advantage
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Rush

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Re: ISO25 on the May 15 2012 build
« Reply #23 on: August 09, 2012, 08:57:37 PM »
But what about details in the dark area?
Overall dynamic range of ISO 25 will be 2 stops less than ISO 100? (with better highlight roll-off, but crushed blacks by 2 EV, yes?)
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KarateBrot

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Re: ISO25 on the May 15 2012 build
« Reply #24 on: August 09, 2012, 09:26:36 PM »
sure, but that's how all ISO values behave. i don't know what you want to say. if something with the exposure value is different than it's going to be in the highlights
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