Anamorphic or Spherical: Definition Magazine – camera test

Anamorphic or Spherical: Definition Magazine – camera test

Anamorphic or Spherical

Anamorphic street art

The above video is for a little fun in case the text below gets boring–Stu Brown

Anamorphic Or Spherical

Monday, December 19, 2011 at 11:06AM

After viewing the material from the ‘ASA test’ we decided to rate our camera at 800 ASA and if needed, push it to 1280.

The second test was to decide if we were going to shoot Anamorphic or Spherical.

Here we had several options.

First I will try to explain several technical things associated with the Alexa sensor. The sensor is exactly the same in the Alexa Plus as it is the Alexa Studio, but for this blog, I will only deal with the 16:9 Mode.

Alexa Studio/Plus + M –

Sensor Size: 3392 x 2200 pixels

16:9 Mode

ARRIRAW: 2880 x 1620 (1.78:1) (Active Pixel Area for 2K Master)

Frameline 1.85:1 : 2880 x 1558

Frameline Flat (2.39:1): 2880 x 1205

Frameline Anamorphic 2x: 1926 x 1620

Frameline Anamorphic 1.3x: 2880 x 1567

see below:

So, in an attempt to explain briefly, (bear with me).

The Alexa sensor is 2880 x 1620 ( 1.78:1 or 16:9 which is also 1.78:1 [16/9 = 1.78:1]

Full HD is 1920 x 1080 ( which is also 16:9 [1.78:1]

If shooting normally (spherical) and framing for 2.39:1, you have an image area of 2880 x 1205, with 207.5 pixels (1620-1205) above and 207.5 pixels below for reframing in post.

•Anamorphic 1.3x : uses the full width of the sensor (2880), but loses several pixels on the height (1567 instead of 1620, we lose 53 pixels) Therefore when you multiply the 1.3x (2880 x 1.3= 3744) and divide by 1567 (3744/1567= 2.39) we end up with 2.39:1 ratio.

But, once we export our material at full HD (1920 x 1080), is 1920 x 1.3 = 2496 and taking into consideration the loss of 53 pixels (which translates to 1044 instead of 1080) we then end up with a 2.39:1 ratio (2496/1044 = 2.39) Read more: Definition Magazine – camera test.

 

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