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Storing and Handling Optical Components
TM-9-254 Gearcase Transfer M548 M548A1 (
Figure 9-26.  Marking a Single Prism
TM 9-254 9-5. Marking Optical Components. a. Lenses.  The primary purpose for marking lenses upon disassembly is to establish a reference, so the lenses can be assembled in their original positions in the instrument.  This mark should consist of a V drawn on the unpolished surface (edge) across all the elements of a compound lens as shown in figure 9-25.  The point of the V should be pointing towards the objective end of the instrument.  All lenses of an instrument will be marked in this manner, thereby eliminating the possibility of assembling them incorrectly.  The marking of lenses can usually be done with a pencil or a magic marker. In addition to the directional marking, the lenses will also be numbered to indicate the sequence in which they are placed in the instrument.  For example: eye lenses should be marked 1, field lenses 2, first erector 3, and so on (fig. 9-25).  The numbering  system  aids  in  preventing  improper  placement  of  the  lenses  which  are  similar  in  appearance  and  easily mistaken for each other.  In some instruments, such as the binocular, the field lens has a very thin edge which is difficult to mark.  In such cases  it  is  necessary  to  note,  when  disassembling  the  instrument,  whether  the  side  of  greater  curvature faces the objective lens or the eye lens, and then assemble accordingly.  It is also advantageous to draw a rough sketch of the optical system of the instrument being repaired, showing the position and relative curvature of all optical components. This may be done as each lens is removed from the optical system.  When assembling the optical components, the sketch can be referred to for proper positioning, thus eliminating guesswork. Figure 9-25.  Lens Marking System b. Prisms.  All markings on prisms are placed on the unpolished surfaces.  In marking prisms used individually, such as an amici or a right-angle prism, mark an arrow pointing toward the objective end of the instrument (fig. 9-26).  The marking of prisms used in pairs (fig. 9-27) such as those in binoculars is a more complex process.  These prisms have certain deviations and variations of light travel, and prism must first be marked to indicate whether it is located in the right or left telescope of the binocular.  Identify such locations by placing an R or L on each prism.  Immediately after the R or L mark and E or O.  The E indicates that the prism is first in the light path of the eyepiece , whereas the O indicates that the prism is first in the light path of the objective lens.  A prism marked LE belongs in the left telescope and is first in the light path  of  the  eyepiece.    To  prevent  the  prisms  from  being  assembled  in  a  reversed  position,  an  arrow  should  be  drawn pointing toward the end of the prisms where they meet on the prism assembly. Change 2  9-18

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