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F-number formula mistake (Landscape Lens Exercise) in Optics Reference

Question

There appears to be an error in the f-number formula for the Landscape Lens Exercise in the OSLO 6.1 Optics Reference. Is this the case?

Synopsis

F-number formula mistake (Landscape Lens Exercise) in Optics Reference

Symptoms

The sentence near the bottom of page 32 (41) in the hardcopy version (electronic version) of the OSLO 6.1 Optics Reference reads: Since the f-number is -1/2*PU (when the object is at infinity) the desired value for PU is -.05.

Solution

This sentence should read: Since the f-number is -1/(2*PU) (when the object is at infinity) the desired value for PU is -.05. This will be corrected in the next update of the Optics Reference manual.