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中空回射器由組裝為角錐稜鏡的三個第一表面反射鏡構成。此結構產生對位置與移動完全不敏感的輕量級「中空角錐稜鏡」。因此會將平行入射光以極高準確度反射回光源，不論入射角多大，都是如此。由於光程在空氣中，因此該組態可消除實心玻璃稜鏡類型回射器中存在的材料吸收與色像差。較大外罩的背板上有多種安裝孔。
The specified beam deviation value of each Hollow Retroreflector is the maximum deviation from parallelism of any single return beam from any of the six sub-apertures, when the retoreflector is fully illuminated. Exiting wavefront is the resultant peak-to-valley wavefront deformation from a fully illuminated retroreflector, which is listed in factors of λ (where λ = 633nm). The unique, patented cushion mounting makes these Hollow Retroreflectors extremely resistant to shock.
| Clear Aperture (CA) | Diameter | L1 | L2 | A | B | C |
| 6.4mm | 8.1mm | 8.1mm * | — | — | — | — |
| 12.7mm | 14.6mm | 19.1mm * | — | — | — | M3 x 0.5 |
| 25.4mm | 41.3mm | 36.5mm | 49.2mm | 44.5mm | 50.8mm | ¼-20 |
| 50.8mm | 76.2mm | 62.0mm | 79.5mm | 78.7mm | 94.2mm | ¼-20 ** |
| 63.5mm | 89.4mm | 61.5mm | 79.0mm | 92.3mm | 101.6mm | ¼-20 ** |
| 127.0mm | 166.7mm | 125.5mm | 150.8mm | 171.5mm | 221.9mm | ¼-20 ** |
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*Does not have back plate
**Additional 8 mounting holes on 50.8mm and larger Dia: (4) M6 x 1.0 at 90° and (4) ¼-20 at 90° on 2" Bolt Circle
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