Optolighting

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Hoffman has been providing testing to the lighting industry for more than 60 years and specifically the night vision industry for over 40 years.  Supported by its state of the art in-house lighting test laboratory Hoffman introduced the first totally integrated image intensifier test set and carries on this proud tradition today with its test equipment being utilized by the US Armed forces and in over 25 countries.

Opto Engineering

Minimum focusing distance is the shortest distance from the focusing plane to the subject, at which it can be sharply rendered, i.e. “in focus”. If we move the camera closer to the subject, we won’t be able to focus on it. Usually in lens properties, lens makers indicate the minimum focusing distance, instead of the working distance, which is far more important in practice.

Effective working distance is the distance from the outer edge of the lens to the subject. This term has a meaning when the lens’ front element resides behind the outer edge of the lens, for example the Sigma 105/2.8 EX Macro and many other macro lenses.

Focal length is the distance from the focusing plane (where the camera’s sensor is) to the rear nodal point of the lens, when focused at infinity. This is a property of the lens, which determines the angle of view as well as the perspective.