A CMOS Sensor Size Comparison and Format Type Look-Up Table with Free Format Type Calculators 

La taille du capteur d'image et la taille des pixels d'un appareil photo sont déterminantes pour la qualité de l'image

The sensor format size and pixel size of digital camera impacts nearly every performance attribute of a camera.

The format size is a key element that contributes to system constraints across the low-light performance, dynamic range, size, cost, power consumption, lens requirement, number of pixels resolution, etc. Each of these will change the form and function of camera.

There are general rules of thumb for how the these will impact the image quality of a camera.  The tradeoffs tend to be continuous and very inter-related across many degrees of freedom.

Every camera use-case has application-specific requirements, so the selection of a CMOS image sensor needs to be made on a case-by-case basis. We've done our best to categorize the usage of  sensor-type by industry.

Digital Camera Sensor Format Types are confusing because of Cathode Ray based Vidicon Tubes

The format type of a digital camera sensor is one of the most confusing in the vision industry. The format type is a remanent from how video camera tubes were constructed prior to the advent of CCDs or CMOS sensors.

These 'video tubes' had opaque regions outside the active area of the cathode tube, which reduced the light sensitive region. These resulted from the mechanics holding either the larger tube or cathodes. 

For example:

• Un capteur d'image de 1″ au format 4:3 mesure 12,8 mm à l'horizontale * 9,6 mm à la verticale * 16 mm à la diagonale.
• Un capteur d'image de 1/3″ avec un rapport d'aspect de 4:3 est de 4,8 mm horizontal * 3,6 mm vertical * 6 mm diagonal.

Well that doesn’t seem to make any sense, does it? 1" is 25.4mm and 1/3 of 1" is 8.5mm! Even 1/3 of the 1" Format Diagonal should be 5mm!

Let's take the 1" format type as an example. Part of the cathode ray tube's diameter was the tube wall and was not used for imaging purposes.

So, the area was reduced from 25.4mm to 16mm. So, a lens suitable for a 1" type cathode ray tube did not need an image circle that extended to the entire 25.4mm tube diameter. 

Some historical references state that the sensor size is 3/2 * Format Type then rounded, however, there are still exist many discontinuities.

With modern day imaging, there exist a nearly infinite number of image sensor diagonal dimensions for which there was no original video tube size corresponding to.

So, we've done our best to derive a "modern-day" equation that defines image sensor format type more precisely. We used commonly agreed upon datapoints of 1" = 16.0mm, 1/2" = 8.0mm, 1/3" = 6.0mm, 1/4" = 4.5mm and backed out a fitting equation, then cross-referenced as many other articles as possible.

Unfortunately, the formula for the digital image sensor type has a discontinuity occurring between the 1/2" image sensor and 1/2.3" image sensor format size.

Ce qu'il faut retenir : Rien ne remplace les valeurs exactes lors du choix d'un objectif.

La plupart des fabricants sont cohérents et précis dans leurs classifications de type de format. Cependant, nous avons rencontré de nombreuses fiches de spécifications qui étaient mal classées.

Je le répète, utilisez toujours le nombre exact de pixels de sortie et le pas de pixel (taille) lorsque vous recherchez un objectif !

Si vous avez déterminé le capteur que vous utilisez et que vous souhaitez calculer l'EFL équivalent au type de format 35 mm, consultez notre calculateur de champ de vision pour appareil photo.