| 摘要 |
An optical device includes an objective and a detector or reticle interacting with the objective via a stop aperture. A decentralizing function for the objective and stop relative to the detector or the reticle is arranged to prevent beams reflected byte surface or surfaces of the detector or reticle from passing back through the stop aperture. By preventing reflection of such beams, little or no reflectance is emitted from the device, thereby making detection of the device more difficult.
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