PIMA IT3.619 : 1998

Foreword
1. Scope
2. Normative references
3. Definitions
4. Classes of rangefinders and focusing aids
5. Rangefinders
6. Focusing aids
7. Best focus criterion
8. Testing of rangefinders and focusing aids
9. Specifications of rangefinders and focusing aids
10.Record of test data
Table 1 - Recommended circle of confusion (Blur circle
          diameters for most widely used formats)
Figure 1- Record of test data - Performance of rangefinders
          and focusing aids
Annex A - Bibliography

Focusing aids and rangefinders used in or on photographic still and motion-picture cameras are described in this standard. It gives methods for testing their accuracy and specifying their performance. Optical systems that are built into cameras either as separate systems coupled to taking lenses, or reference screens (microprisms, etc) that are located within viewfinders of single-lens reflex (SLR) cameras in which taking lens is the finder objectives are covered for the most part of this standard.