Tag Archives: CMOS sensor

Sensor size

One of the main reasons I bought a new camera was to move to a larger sensor size.  The ability to gain better depth of field, less noise at higher ISOs and sharper less noisy prints at larger sizes were all contributing factors.

So how does a larger intermediate DSLR sensor compare to a sensor found in  a point and shoot, or bridge camera.  I will take my new a6000 and compare it with my old HS20exr.

The Sony Alpha 6000 has a 24 megapixel, 23.5×15.6mm Exmor APS HD CMOS sensor.  A diagonal of 28.21mm, a surface area of 366.60mm², and a pixel density of 6.65MP/cm².

The Fuji HS20exr has a 16 megapixel 6.4×4.8mm EXR CMOS sensor.  A diagonal of 8mm, a surface area of 30.7mm², and a pixel density of 51.93MP/cm².

So what do the actual sizes look like?

Print

Looking at the specifications its easy to see that the a6000 is going to be getting a whole lot more light per pixel, the pixel size is greater and they are less densely packed.  That is going to mean a better image with less noise, and the ability to crop down much more without loosing definition, so I should not miss the ‘superzoom’ that much.

Lets have some crop comparisons at different ISOs.  In all cases the shot was at roughly 50mm full frame equivalent, and at f5.6.  The a6000 shots are on the left and the HS20 on the right, jpegs straight from the cameras.

ISO100100

ISO400400

ISO32003200

It is easy to see just how much better the a6000 is as you loose light, the HS20 gets very grainy.  So am I pleased – oh yes.