ZOOM LENS QUICK REFERENCE
 
| Zoom Ratio | Part Number (Degrees) | Focal Length | General Drawing/Data | Transmittance Graph | Notes | 
| 9X | 9X121 | 12.1 mm - 120.0 mm |     |     | A compact lens with very good resolution, inherent boresight retention, and durability. | 
| 9X182 | 18.2 mm - 180.0 mm | 
| 9X242 | 24.2 mm - 240.0 mm | 
| 20X (A) | 20XA600 | 6.0 mm - 121.0 mm |     |     | Compact lens with very good resolution, inherent boresight retention, and durability. | 
| 20XA900 | 9.0 mm - 180.0 mm | 
| 20XA120 | 12.0 mm - 242.0 mm | 
| 20X (B) | 20XB150 | 15.0 mm - 300.0 mm |     |     | Very compact lens with very good resolution, inherent boresight retention, and durability. | 
| 20XB300 | 30.0 mm - 600.0 mm | 
| 28X | 28X940 | 9.4 mm - 255.0 mm |     |     | Long FL in a relatively compact package. Many thousands sold with excellent inherent traits. | 
| 28X141 | 14.1 mm - 382.50 mm | 
| 28X189 | 18.9 mm - 510.00 mm | 
| 30X | 30X102 | 10.2 mm - 310.0 mm |     |     | Long FL, large aperture, very good resolution, and modular mechanical design. | 
| 30X153 | 15.3 mm - 460.0 mm | 
| 30X204 | 20.4 mm - 620.0 mm | 
| 32X | 32XA156 | 15.6mm - 500.0mm |     |     | Superb resolution and long FL make it an excellent candidate for medium/long range surveillance. | 
| 32XA312 | 31.2mm - 1000.0mm | 
| 34X | 34X102 | 10.2 mm - 350.0 mm |     |     | Long FL, large aperture, very good resolution, and modular mechanical design. | 
| 34X153 | 15.3 mm - 520.0 mm | 
| 34X204 | 20.4 mm - 700.0 mm | 
| 59X | 59X130 | 13.0 mm - 775.0 mm |     |     | Fast, good resolution. Economy price! Excellent candidate for border surveillance. | 
| 59X195 | 19.5 mm - 1162.0 mm | 
| 59X260 | 26.0 mm - 1555.0 mm | 
| 63X | 63X163 | 16.3 mm - 1028.0mm |     |     | Superb resolution and long FL make it an excellent candidate for long range surveillance. |