Jump to content
Sign in to follow this  
Kasper Nystrom

Arri Alexa 16:9 vs 4:3 sensor

Recommended Posts

I am considering buying an Arri Alexa for my film company. Most of our project is filmed in 16:9 with normal spherical lenses, but I want to have a camera that can handle anamorphic lenses too.

So i am wondering if the Arri Alexa plus 4:3 is cropping in when you have it on 16:9 mode and shoot with spherical lenses, and i should therefore go with the Arri Alexa classic ev with the 16:9 sensor?

Share this post


Link to post
Share on other sites

It’s the same sensor, which is 1.54:1 full aperture, it’s just passed QC to allow the full height for 4x3 use.

  • Like 1
  • Upvote 2

Share this post


Link to post
Share on other sites

“QC” meaning Quality Control. They build the wafers for these sensors and check them for dead pixels, etc. and some aren’t perfect from corner to corner but the area to be used for 1.78 is good, so it can be used for a 16x9 recording but not for Open Gate or 4:3 recording. But all the S35 Alexa sensors are the same physical size and shape, 1.54 : 1. 

Share this post


Link to post
Share on other sites

Oh i see.

So same sensor size, but is it the same resolution?

I have heard some say that the Alexa classic has a 2.8k sensor, and the Alexa mini has a 3.2k sensor.

Share this post


Link to post
Share on other sites

It’s all the same 1:54 : 1 / 3.4K sensor in all the Alexas (except the LF and Alexa 65, which also use the same sensor but stitch two or three together) — it’s the Alev sensor. It’s just that some cameras allow you to record all of the sensor area and thus resolution. 2.8K is just a smaller width of the sensor than 3.2K or 3.4K. The original Alexa limited the width to 2.8K because that was the same width as Super-35 film and the rest of the sensor area could be used for lookaround in the viewfinder.

Share this post


Link to post
Share on other sites
On 1/3/2020 at 10:04 PM, David Mullen ASC said:

It’s all the same 1:54 : 1 / 3.4K sensor in all the Alexas (except the LF and Alexa 65, which also use the same sensor but stitch two or three together) — it’s the Alev sensor. It’s just that some cameras allow you to record all of the sensor area and thus resolution. 2.8K is just a smaller width of the sensor than 3.2K or 3.4K. The original Alexa limited the width to 2.8K because that was the same width as Super-35 film and the rest of the sensor area could be used for lookaround in the viewfinder.

Is there any way to film in 3.2K or 3.4K with the Alexa Plus 4:3?
I feel it is a waste of pixels to not utilize all of the Alev sensor.

Share this post


Link to post
Share on other sites

I believe there was a software upgrade to the old Alexa Plus 4:3 to allow 3.2K ProRes and 3.4K Open Gate. Of course, you wouldn’t be recording a 4:3 image anymore at those resolutions since you’d be using more of the sensor’s width. As I keep saying, the overall sensor in all Alexa cameras are the same, 1.54 : 1, 3.4K. So 4:3 sits inside this, using the max height but cannot use the max width. So 4:3 is 2.8K wide.

There was an ad in our marketplace that mentions the options:

https://cinematography.com/index.php?/topic/81870-arri-alexa-plus-43-cinema-camera-for-anamorphic-or-169-13750/

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  


  • Abel Cine



    Wooden Camera



    G-Force Grips



    Metropolis Post



    Broadcast Solutions Inc



    Media Blackout - Custom Cables and AKS



    Glidecam



    CineLab



    Visual Products



    Tai Audio



    Serious Gear



    Rig Wheels Passport



    Ritter Battery



    Paralinx LLC



    Just Cinema Gear



    The Original Slider



    Gamma Ray Digital Inc



    FJS International



    New Pro Video - New and Used Equipment


    Cinematography Books and Gear
×
×
  • Create New...