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Messages - ursamajor

#1
Camera-specific Development / Re: Canon 550D / T2i
October 27, 2017, 06:48:10 PM
No, only in "Simple" mode take pictures. Tested many times.
#2
Camera-specific Development / Re: Canon 550D / T2i
October 27, 2017, 05:57:36 PM
Hello, I tried to use Silent picture feature and I have a problem. I selected in Q menu "full resolution/DNG", but when I half press shutter, the display become black. If I change to "Simple" it works, but the saved resolution is only... 1734x1156. Is there a fix, or these are limitations of ML/550D camera?
#3
If primary ISO is 1600 ISO I get very few hot pixels and too many at 3200 ISO. But 3200 it's already too much, I used it just for experiments. :)
Anyway Dual Iso has stunning results.
#4
QuoteIf you want both low noise and good highlight detail in HDR scenes, try dual ISO.

It was the next step I wanted to ask: to have ETTR + DualISO it's absolutely necessary to activate DualISO or it's enough to select "linked to DualISO" in ETTR submenu, so that I can have ETTR+DualISO only when I activate ETTR? Sincerly, I don't like to have active DualISO all the time, because at primary high ISOs I get many hot pixels. By the way, what version is the DNG file obtained from cr2hdr software/plugin processing of CR2s files? I noticed that my DNG v. 1.3 from CHDK installed on my compact are hot pixels free. On the other hand, the v. 1.0 had tons of hot pixels. Just an idea...
#5
I understood, I'll try to increase the target exposure to see what's happen.

Look the photos and correspondent histograms with both SNR OFF.
As far as I understand ETTR sometimes can become ETTL. If the purpose of ETTR is to limit the noise, ETTL is far from this from my point of view. Of course, I understand, there are limits that ETTR/ETTL cannot transgress. Still I believe that  it'll be very usefull some hints for settings in a manner to help in most common situations.
Anyway, you were so kind and that's why I thank you one more time! I'll use my week end for experiments, especially now after changing my focusing screen.  :D
I wish you a good night and a nice week end!

#6
QuoteIn low light (i.e. high noise) situations ETTR will clip highlights to maintain the requested midtone and shadow SNR limits. To disable this, simply turn the SNR limits off in the ETTR submenu.

I disabled both, but now ETTRight became ETTLeft. Underexposed to maximum of 1/4000 s.  :'(
#7
In low light (i.e. high noise) situations ETTR will clip highlights to maintain the requested midtone and shadow SNR limits. To disable this, simply turn the SNR limits off in the ETTR submenu.

Thank you for idea!

Look the histograms. The 2nd and 3rd pictures from outdoor have virtually the same histogram, that's why I attached only the first screenshot of histogram to the collage.

In low light (i.e. high noise) situations ETTR will clip highlights to maintain the requested midtone and shadow SNR limits. To disable this, simply turn the SNR limits off in the ETTR submenu.

#8
How to? Histogram from Lightroom? Or from the camera? In that second case I must reload RAWs on the SD card, I already transferred on HDD. :D
Or read it with another software... it was a link in one thread.
EDIT: RAW Digger... I'll install it and made asked corrections in the collage.
#9
Enable image review from Canon menu. written with orange. Is that necessary for ETTR to work properly? I deactivated this function because usually I don't need to review my pictures.
I activated it.
Mode M, Viewfinder/Live View: I took an underexposed picture (as asked) then camera beeped and the exposure for the next pics was the same, not at all exposed to the right. Pictures taken to a normal DR scene (outdoor series).
When I took pictures to a higher DR scene (my monitor in a dark room, indoor series), it took first pic at 100 ISO, then increased to 400 ISO at the second pic and to 800 ISO for the next pics... Noticed that last exposure (at 800 ISO) had some clipping on highlights, making it unusuable in a certain degree.

Is this the workflow: taking first underexposed picture then expect to take the second (third etc.) with ETTR?
Thank you very much for your patience, benevolence and your kind availability!  :-*


#10
Back one level it is Exposure menu. No ETTR menu independently.
ETTR appears as submenu in Expo Menu and in Triangle Menu. What I don't understand is why ETTR appears in gray as it wouldn't be active, although under this gray color it appears as ON (see pictures bellow). Is there a reason for that?


#11
Do you mean this menu? I set only minimum exposure time/slowest shutter and let the rest as default. Took pictures in varied scenes: high DR, normal DR etc. Should I modify some settings? Is there an ETTR guide somewhere? I already read 2-3 threads but nothing clear, just some examples/samples.

What's the difference between this AETTR and manual ETTR by exposure compensation, excepting automation?

#12
OK, I made some tests to see how ETTR works on my Canon 550D.
I put the ETTR "Always ON", switched to Manual mode (read that only in this mode it works properly) and... nothing happened. I tried to take pictures in different lightened scenes, still nothing. So, in M mode ETTR doesn't make any adjustement.
Switched to "Av mode" just for checking. Something happened here, but the mode of compensation of exposure seemed to me... chaotic, not at all consistent: sometimes compensation was +2/3EV, sometimes -1, TO THE SAME SCENE, just after press half shutter.
All of these work ONLY IN LIVE VIEW mode, they don't work in Viewfinder mode.
The camera don't use the minimum shutter speed set...
Where am I wrong or what it is wrong to this build from 2016 May 07?

My ETTR settings are... see picture bellow:


#13
Yes, exp. comp. got stuck.
It was last nightly build, 2016 May 07, I think.
#14
Indeed I used Av mode. I couldn't (re)set exposure compensation, I know how to do it. ;) After reading the first linked post, I understood that this is the behaviour of ETTR on Auto modes. I'll switch on M to see if it works. I'll keep you posted.

Thank you very much for replies, really helped me.  :)
#15
Canon 550D...

There are 4 settings for ETTR in its menu (http://www.magiclantern.fm/forum/index.php?topic=5693.0):
    Always On:  AETTR is always active.  In photo mode through the viewfinder, this means that AETTR is always inspecting the exposure in the image review, and setting the exposure settings for the next shot.  In Live View, this means that AETTR is always looking at the image in the live view, and adjusting the exposure settings as necessary.
    Auto Snap:  After taking a shot, AETTR will take another shot if necessary.
    Press Set:  AETTR activates by pressing the SET button.  In photo mode through the viewfinder, AETTR will turn on live view, determine the correct exposure settings, and return to photo mode.  In live view modes, AETTR will determine the correct exposure settings.
    HalfS DblClick:  This functionality is exactly like Press Set above, except the trigger button is half pressing the shutter button twice.

Now, reading from above, I believe I was a little n00b.  ;D Still, the exposure compensation (+5EV) made by ETTR is way too much.
#16
Having ETTR activated I noticed that in Live View mode the exposure is corrected by +5EV compensation. Wtf, is this correct? And, unfortunatelly, the exposure compensation cannot be adjusted. Switching on Viewfinder mode, the exposure compensation (+5EV) remains, but, fortunatelly, it can be reset. It's a bug or it's a feature?  :D
#17
Very good, thank you very much!

Trimis de pe al meu X2_Soul folosind Tapatalk

#18
Is there a detailed guide somewhere for how to use these features or it's only in ML general manual?
#19
In the first post of this thread a1ex said:

Histograms, ETTR, playback tricks

- ETTR integrates with dual ISO (just enable both). It will use dual ISO only in high dynamic range scenes. Adjust the SNR limits to let the algorithm know what exactly is a "high dynamic range scene" and to fine-tune the balance between midtone/shadow noise and highlight aliasing.


I enabled both DualISO and ETTR on my 550D, but even in normal scenes I get DualISO RAW. Where am I wrong?
#20
Hi, please tell me where can I find details about the workflow needed to get a HDR video from a flickering one. Thanks in advance,