Magnifyr.len - A conventional 5X magnifier

Magnifyr.len - A conventional 5X magnifier

This lens is an ordinary 50mm focal length singlet, 31mm diameter, set up as it would be for use as a visual magnifier. The eye relief has been assumed to be 250mm, and the pupil diameter has been taken as 10mm to provide freedom of eye movement.

This lens has been included in the demo library mainly for comparison to the Fresnel diffractive magnifier (magfrenl.len). A great deal of caution needs to be exercised in interpreting the ray analysis for a visual instrument such as a magnifier, because the eye is neither in a fixed position, nor at a fixed focus. The eye (particularly a single eye) can tolerate rather poor imagery, but tends to be intolerant of imagery that changes rapidly with eye position.

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