The Leica DMS1000 offers telecentric optics. What exactly does this mean?
Put your thumb in front of your eye and look at a tree, car or house. They appear to be about the same size, while in reality, we know your thumb is much smaller. This disproportionate perception occurs because our eyes are not telecentric, so objects closer to our eyes appear larger. Non-telecentric metrology solutions inaccurately measure objects closer to the camera as larger than objects farther away from the camera. Because the Leica DMS1000 offers fully-telecentric optics, users can rely on the system for accurate measurements. Please keep in mind that the Leica DMS1000 only is telecentric with an adapter and the proper objectives as mentioned in the user manual.
What is the difference between parcentric and telecentric?
Parcentric optics help keep the area of interest centered though-out the entire zoom range. This saves time as users need not move the sample for each zoom setting. Telecentric optics uses rays for imaging that leave the object plane at a perpendicular angle. This helps to avoid lateral shifts of the field of view and/or variations of the imaging scale during focusing as the perspective is perpendicular over the whole object field.
What is the benefit of being parfocal and parcentric and how do I set this up?
A parfocal and telecentric system enables users to change the magnification without having to refocus or reposition the sample on every zoom setting. The setup is straightforward and simple. First center your sample on the monitor at the lowest zoom setting and the bring it into focus. Then move the magnification to the highest setting and again the bring the image back into focus. The specimen or area of interest will remain centered and in focus throughout the zoom range.
Since the Leica DMS1000 does not utilize eyepieces, how is magnification calculated?
With the Leica DMS1000, a monitor takes the place of eyepieces. As a rule of thumb, the larger the monitor, the greater the magnification factor. The magnification range of the Leica DMS1000 system provides ranges from about 3x to 300x using a 10” and 22” monitor respectively.