Adding close-up lenses
After a further design study we found to use a common lens in combination with close-up lenses, also from Schneider-Kreuznach. For this we used the lens with the closest field of view available, i.e. the 50mm lens with a FOV of 6.5°. Using a mounting adapter on top of the 50mm lens allows to add a close-up lens, which directly results in a spot size in the mm-cm scale.
The advantage of this solution for the customer is huge. It now is possible to add a various number of the close-up lenses individually, meeting each requirement to the spot size in the macroscopic scale. The accuracy of the camera is not affected, because it is calibrated with the 50mm lens in our laboratory and the transmission rate of the close-up lenses is almost 100%.