Why Do 1/2.5" Lenses Often Fit Better than 2/3" Lenses?
Most lenses are designed for 2/3" sensors, which works perfectly fine for cameras equipped with a sensor of that size. In response to the trend towards smaller sensor sizes, Basler has developed lenses with a small image circle that matches the small surface of modern sensors. Basler Lenses are produced by Fujinon exclusively for Basler and labeled as "Basler Original Equipment".
To best take advantage of their cost-optimized design for a multitude of applications, they are available in six different focal lengths:
- 4 mm
- 6 mm
- 8 mm
- 12 mm
- 16 mm
- 25 mm
The benefit of a smaller image circle is especially prominent with regards to resolution, thus:
Small sensor + lens with small image circle = the perfect combination!