Sony a33 vs Sony a390

This is a full comparison between the cameras Sony a33 and Sony a390. We compare them by looking at the categories you see below.

Sony a33

Sony a390

Manufacturing

These cameras are both manufactured by Sony.

These two camera models were both released 2010.

Camera	Released
Sony a33	2010
Sony a390	2010

Type of camera

Sensors / crop factor

Both these cameras have the same sorts of sensor (called "Sony APS-C") which means that if you compare these cameras side by side the lenses will also have the same experienced focal length. Neither of the cameras has a Full frame sensor which means that you will get a "crop factor" where the camera's sensor size affect the focal length with a multiplier.

Camera	Focal length, 50mm f/1.8 **
Sony a33	75 mm Sony APS-C sensor Crop factor/focal length multiplier by * 1.5
Sony a390	75 mm Sony APS-C sensor Crop factor/focal length multiplier by * 1.5

** Experienced focal length when using a lens such as a common "50mm f/1.8"

Learn more about crop factor and focal length multiplier here:
Camera selection can affect the focal length (Sony)

Resolution

Both these cameras have the exact same resolution. Sony a33 has a 14 MP (Megapixels) resolution while Sony a390 has 14 MP. If we break down this in more detail this is the data behind the numbers:

Camera	Megapixels
Sony a33	14 MP 14033152 pixels 4592 x 3056
Sony a390	14 MP 14033152 pixels 4592 x 3056

ISO range

Sony a33 has a larger ISO-range than Sony a390. Sony a33 has an ISO range that stretches from 100 to 12800 while Sony a390 has 100 to 3200.

Camera	ISO Range
Sony a33	100-12800
Sony a390	100-3200

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that support autofocus, do not have an autofocus motor of their own but this won't cause any problems with these two cameras.

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Sony a33
Lens compatibility chart for Sony a390

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Sony a33 can shoot up to 7 pictures per seconds and Sony a390 can shoot up to 2,5 pictures per seconds.

Camera	FPS (Frames per second)
Sony a33	7
Sony a390	2,5

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

When comparing these two cameras there is only one of them that can shoot movies and that is Sony a33. Unfortunately Sony a390 does not support recording movies and movie clips.

Weight

The weight of the camera can be an extremely important factor, especially if the camera is about to be used, or carried around, for several hours at a time.

Sony a390 weighs 549 gr (equal to 1.21 lb) which is 10% heavier than Sony a33 and its 500 gr (or 1.1 lb).

Camera	Weight
Sony a33	500 gr 1.1 lb
Sony a390	549 gr 1.21 lb