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Reticle of Bell & Howell Pocket Comparator
Reticle of Bell & Howell Pocket Comparator
Reticle accessory (PD-8) used in sniper rifles
Reticle accessory (PD-8) used in sniper rifles
The day and low-light reticles of the integral reflex sight used on the FN P90 / PS90 USG models
The day and low-light reticles of the integral reflex sight used on the FN P90 / PS90 USG models
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A collection of different types of eyepieces.
A collection of different types of eyepieces.
A 25 mm Kellner eyepiece
A 25 mm Kellner eyepiece
Simulation of views through a telescope using different eyepieces. The center image uses an eyepiece of the same focal length as the one on the left,
Simulation of views through a telescope using different eyepieces. The center image uses an eyepiece of the same focal length as the one on the left, but has a wider apparent field of view giving a larger image that shows more area. The image on the right has the same apparent field of view as the center eyepiece but has a shorter focal length, giving the same true field of view as the left image but at higher magnification.
The Plössl, an eyepiece with a large apparent field of view
The Plössl, an eyepiece with a large apparent field of view