Patent ID: 9535232
Date: 2017-01-03
CPC Classifications: F16M,G01B,G02B,G03B

Claim:
1. Device for determining the depth of field for a specific distance, comprising manually focusable measuring optics with no focussing screen, a computer, an output unit and a sensor, wherein the measuring optics comprises a manually displaceable mechanism configured for manual focussing by an operator by means of the human eye, wherein the sensor is configured to monitor the movement of the displaceable mechanism during manual focussing of the measuring optics by the operator from an unfocused condition to a focused condition, and wherein the computer is arranged to determine the distance by evaluation of signals of the sensor from the monitored movement of the displaceable mechanism so that, under consideration of focal distance, aperture, hyperfocal distance and circle of confusion, the computer arithmetically determines and outputs the range of the depth of field to the distance.