Bringing it All into Focus: Finding the Right Lens for Your Camera
In order to get a good, sharp image, you not only need a good camera, but also the right lens for the camera. Right from the beginning the sheer unlimited selection of possible lenses is apparent. For digital compact cameras there is usually a permanently installed lens; for reflex cameras you can work with exchangeable lenses in order to get the best possible image in many different situations. The individual lenses vary not only in their resolution, angle width, and size, but also in their construction. This is also a "problem" with machine vision cameras and the lenses that are appropriate for them. Which lens is the correct choice for which conditions will be explained in the following article.
Which Factors Should I Consider When Selecting a Lens?
1. Sensor Size and Image Circle
The sensor size is a decisive factor in selecting the correct lens. High resolution area scan and line scan cameras in particular have larger sensors than cameras with lesser resolution. The dimensions of sensors are not determined by any standard, but are defined by the resolution and the pixel size of the sensor. Theoretically, anything is possible here, it is only a question of price. The sensor size is given in inches, but corresponds to a sensor diagonal of 1 inch per 16 mm and not 25.4 mm. There are historical reasons for this.