The dust on the sensor It has always been one of the major problems of SLR cameras. The possibility of exchanging goals, although it gives an incredible to any SLR versatility, favors that dust in the air suspension, push through the bayonet and is stuck to the sensor, stains on the images, very visible with closed diaphragms.
Once seen how the live view or view live digital SLR, we continue giving a review to other technologies that have been implemented in this type of cameras. Today we will see another important feature that solves, in greater or lesser extent, the powder that enters the bodies of the Chambers, dirty sensor.
In addition not only of external powder their own sensor becomes dirty metal miniparticulas they emerge inside the Chamber because of the mechanical shutter or mirror parts, can cause contamination by dust due to the friction that occurs during its movement, and can also produce this type of stains.
How you can know if your sensor have dust spots? As easily:
- Put the camera in priority mode opening
- Closes the aperture to the maximum (high f value)
- Cut to a white or very light background for example a blue sky.
- Open the photo with an editing program, like for example photoshop.
- You are looking for points like these:
- If you want to accentuate the effect get (not suitable for sensitive) adjustment
Now that you have seen the consequences of powder perhaps you might want to find a SLR with a sensor dust reduction system.
Brands, to avoid this unpleasant effect, a few years have opted to introduce technologies that reduce as much as possible this problem of the reflex.
Basically, these systems consist of place, in front of the sensor, an element that protects it and that by means of vibrations remove any dust that may remain attached to the. These vibrations occur normally when you turn on the camera, which means that it is when more dust to been able to enter the body, if we changed the objective.
Depending on the brand, these systems work better or worse, but it seems that all of them have opted to finally introduce it as basic characteristic in the reflex.
In the case of Olympus, which is what most know, the system, one of the most valued, consists of a sapphire glass positioned in front of the sensor, by means of an ultrasonic vibration of 35000 cycles/second (during a second and a half) drives out the dust, which goes to an adhesive strip, which prevents to be suspended again.
In this video you can see how it works:
As you can see, this type of system, are a good feature to consider in the digital SLR, especially if you like the picture in “unfriendly” environments, or if you simply have many objectives and indoors constantly changing them.
Remember that you can follow the special through the front page banner. In the next article we will see another interesting feature of SLR cameras: stabilization systems. We hope you like it.