Bilal's crop_rec_4k experiments for 650D / 700D (T4i / T5i)

[theBilalFakhouri]

@Icaab

The footage looks good, you aren't using Dual ISO correctly, procced files will always have the low ISO exposure (then in Post you can raise exposure and you will have clean shadows).

Why your footage looks dark? because it's underexposed in first place, and in your case (the MLV file you shared) you don't need to use Dual ISO (your scene is flat, no much required dynamic range), there is no reason to start with 100 ISO in this case, you can start with 400 or 800 ISO and you probably won't have blown highlights.

Simple way to use Dual ISO correctly: You probably want to use Dual ISO only in contrasty scenes when you have bright highlights and dark shadows, expose your shot correctly (e.g expose for highlights), let's say you used 100 ISO as base, now turn on Dual ISO and set second ISO to 800 to get clean shadows recovery in post.

For example, take a look in these photos:
https://www.magiclantern.fm/forum/index.php?topic=7402.msg62865#msg62865

[Icaab]

I've just finished testing with the isoless build, everything works perfectly,
Dual Iso + Crop rec (1x3 uhd) + Raw v1: great for video
Dual Iso + Crop rec V2 (1:1 5000x3500) + Silent pics (burst) + Raw MLV: great for pics

It's amazing what you did with a entry level camera,

5K, 10bit, 2:35, 23,976 Continuous raw with dual iso, it's amazing, Thank you

Hello. How did you manage to take a photo with a crop that appears when you turn on the module Crop rec V2? (my camera 650d)

[Icaab]

@Icaab

The footage looks good, you aren't using Dual ISO correctly, procced files will always have the low ISO exposure (then in Post you can raise exposure and you will have clean shadows).

Why your footage looks dark? because it's underexposed in first place, and in your case (the MLV file you shared) you don't need to use Dual ISO (your scene is flat, no much required dynamic range), there is no reason to start with 100 ISO in this case, you can start with 400 or 800 ISO and you probably won't have blown highlights.

Simple way to use Dual ISO correctly: You probably want to use Dual ISO only in contrasty scenes when you have bright highlights and dark shadows, expose your shot correctly (e.g expose for highlights), let's say you used 100 ISO as base, now turn on Dual ISO and set second ISO to 800 to get clean shadows recovery in post.

For example, take a look in these photos:
https://www.magiclantern.fm/forum/index.php?topic=7402.msg62865#msg62865

Okay. I realized my mistake.
I’m sorry, but can you drop the link to some instruction that describes how to shoot a timelapse with a dual ISO and a silent picture? (intervalometer doesn't work with these modules)

Also for a silent picture : I choose ful-res and shutter speed on frames always 1/4, whichever I choose. Am I to understand that this can only be fixed with an nd-filter?

And if I get a dng photo, how do I remove vertical stripes in mlvapp?

[2blackbar]

wrong topic...

[barton_senger44]

Is there a way to get non stretched liveview in uncropped 1738x1880 1x3 binning?

[theBilalFakhouri]

Okay. I realized my mistake.
I’m sorry, but can you drop the link to some instruction that describes how to shoot a timelapse with a dual ISO and a silent picture? (intervalometer doesn't work with these modules)

Silent picture isn't reliable for 700D in crop_rec_4k branch, you need to use burst mode with RAW video off, IIRC intervalometer does work with that.

Also for a silent picture : I choose ful-res and shutter speed on frames always 1/4, whichever I choose. Am I to understand that this can only be fixed with an nd-filter?

Full-Res in Silent picture doesn't use LiveView (the RAW resolution from crop modes), it's same as capturing normal RAW photos but without using mechanical shutter, read about it here, if you want to use full-resolution with fast shutter speed, set Crop mode V2 to full resolution preset and set silent picture to Burst mode, also turn on Full shutter range from Crop mode V2 submenu (read the first post for more details).

And if I get a dng photo, how do I remove vertical stripes in mlvapp?

I think there is an option in MLVApp to transcode and import DNG/CR2 files to MLVApp, or just use MLV option from silent picture.

[theBilalFakhouri]

Is there a way to get non stretched liveview in uncropped 1738x1880 1x3 binning?

There is "Framing" preview, it's not real-time preview but it's useful for framing, you can set it from RAW video submenu or toggle between real-time and framing preview by pressing half-shutter in LiveView.

Have you tried yet the following steps?

@barton_senger44
Thanks, you already got them (from the registers).

I am using the addresses you have provided in this build:
https://bitbucket.org/bilal_fakhouri/magic-lantern/downloads/crop_rec_4k.2021Aug22.700D115_Shutter_Blanking.zip

This build should work for you without the shutter issue, please try it and feedback, make clean install (format SD card in PC then format it in camera then install the build from firmware update after coping the files to SD card).

Does the shutter issue still present?

[barton_senger44]

Ill try it right now I was busy with some stuff lately

[ML700D]

hi again bilal.. 
just thinking.. can I use 50fps 1080p? or it is just 720p? with 1x3 binning mode?
I worried if something gone wrong as a noob lol..
so i ask you questions first.

thanks 

[theBilalFakhouri]

@ML700D

You can play with Crop mode V2 and see what max FPS you can get at what resolution and binning mode , 1736x970 3x3 @ 50 FPS is possible but can produce corrupted frames in lossless compression, and requires high write speeds (not practical)

AFAIK 1736x864 3x3 @ 50 FPS (maybe 48 FPS) is usable with lossless compression, might not be continuous. Using 1x3 binning mode with High-FPS would lead to very wide aspect ratio.

[ML700D]

@ML700D

You can play with Crop mode V2 and see what max FPS you can get at what resolution and binning mode , 1736x970 3x3 @ 50 FPS is possible but can produce corrupted frames in lossless compression, and requires high write speeds (not practical)

AFAIK 1736x864 3x3 @ 50 FPS (maybe 48 FPS) is usable with lossless compression, might not be continuous. Using 1x3 binning mode with High-FPS would lead to very wide aspect ratio.

I ever tried using crop mode V2 but still confusing with the setting and get pink zebra at live view sometimes, so how to calculate it properly? thanks.