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
Thanks for the vid!
this features is on new firmware 2.3??
yes
More info: http://magiclantern.wikia.com/wiki/ISO (http://magiclantern.wikia.com/wiki/ISO)
That's a very rough draft - take it with a grain of salt.
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.
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)
In photo mode you can shoot RAW - which contains all the dynamic range you can get.
Is it possible integrate this feature into auto ISO?
Or is there any better way to use ISO25 in light changing scenes?
No.
For light changing scenes, @3pointedit had the idea of using HDR video - take a look around.
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
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)
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?)
160 is pulled down from 200, so the RAW files shot with these two ISOs will be identical.
The lowest analog ISO is 100.
so that's a "No"?
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
rarely use iso700 though
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. ;-)
Does this lower iso works with pics? I am new to magic lantern.
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.
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?
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
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?)
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
Certainly the highlights are clipped but that is the point of shooting low ISO isn't it? The other thing to remember is that only the red channel seems to be badly effected by clipping. Perhaps you can remap the other channels into the top of the red and retain some detail that way?
Quote from: 3pointedit on August 12, 2012, 05:43:52 AM
The other thing to remember is that only the red channel seems to be badly effected by clipping.
If the highlights turn pink that means the green channel is being affected. The green channel seems to clip earlier than red and blue. I don't know why but maybe because in the light's spectrum green is more intense than red and blue.
Yeah of course. Look at me talking out my behind. I thought initialy that the other channels were being pulled down not just clipped but I guess you are right. Thanks for catching that bad advice ;)
Im a bit confused, is this for film mode or for shooting? Iso 25 would be great for long exposures.
There's a thing called ND filter for that
eactly what I desperately willing to know about how ISO settings/values affect shooting.
Do you know what I learned? ML enable having better photographics results. :)