By Matt Kirk
In the summertime of 2013, Matt Kirk did what not anyone earlier than him had but to complete: with no the aid of a committed team, he backpacked the total 2,185-mile Appalachian path from Maine to Georgia in below 60 days. this can be his tale.
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Extra resources for Fast, Light and Free on the Appalachian Trail
Porro-Abbe system (4 R) – a variation of the Porro system where the sequence of reflections is changed. Pechan-roof prism (6 R) – a roof is added to a Pechan prism. This prism is used in compact binoculars and provides a straight-through line of sight. fm Page 42 Wednesday, December 17, 2003 4:51 PM 42 Geometrical Optics Plane Parallel Plates A ray passing through a plane parallel plate is displaced but not deviated; the input and output rays are parallel. 1 – sin2 θD = t sin θ 1 – ------------------------n2 – sin2 θ –1 ------------- D ≈ tθ n n (in air) An image formed through a plane parallel plate is longitudinally displaced, but its magnification is unchanged.
This roof mirror can replace any flat mirror to insert an additional reflection or parity change. An equivalent plane mirror is formed at the dihedral line. All rays through the roof mirror have the same optical path. The dihedral line is often in the plane of the drawing, and the presence of a roof mirror is indicated by a “V” at the equivalent mirror or dihedral line. fm Page 39 Wednesday, December 17, 2003 4:51 PM Optical Systems 39 Prism Systems Prism systems can be considered systems of plane mirrors.
A field stop can be placed at the intermediate image plane to restrict the system FOV. This aperture serves to limit the field to a well-corrected or non-vignetted region. Reticles and graticles provide alignment and measurement fiducial marks, and they are placed in the intermediate image plane to be superimposed on the image. Since both the reticle and the image are in focus, reticles must be clean and defect free. Two special eyepiece configurations displace the field lens from the intermediate image plane.