View through opening and interfering contour - Calculating the distance or diameter

"Normal", entocentric lenses all have a fixed opening angle: as the working distance grows, the field of view increases. Often the inspected object must be monitored through an hole or other interfering contours. If the disturbing aperture is not large enough or too close, the image will be blocked at the edges.
A typical example is the opening of a dome light, coaxial light or ring light, wher you want to look through. The maximum possible distance to the bottom edge (!) of the interfering contour can be calculated with this tool.

Hint: Please specify field of view / object size as diagonal!

Distance to
Opening

Diameter
Opening

Calculating the working distance to the aperture with known diameter

We respect your privacy: We do not store any inputs, results or recipients. Send your calculation with your own email program (MailTo-link).