| TeleVue Pronto (70mm) Refractor 480mmFL @f/6.8 |
| Design | Focal Length (mm) |
Apparent Field (°) |
Barrel Size |
Mag. (x) |
Exit Pupil (mm) |
True Field (°) |
True Field @1000 yards (feet) |
Mag.
w/2x Barlow |
Mag.
w/2x Big Barlow or Powermate |
Mag. w/2.5x Powermate |
Mag. w/3x Barlow |
Mag. w/4x Powermate |
Mag. w/5x Powermate |
| Plössl | 55 | 50 | 2" | 8.7 | 8.0 | 5.5 | 287.5 | -- | 17.5 | -- | -- | 34.9 | -- |
| Plössl | 40 | 43 | 1¼" | 12.0 | 5.8 | 3.2 | 168.8 | 24.0 | 24.0 | 30.0 | 36.0 | 48.0 | 60.0 |
| Plössl | 32 | 50 | 1¼" | 15.0 | 4.7 | 3.2 | 168.8 | 30.0 | 30.0 | 37.5 | 45.0 | 60.0 | 75.0 |
| Plössl | 25 | 50 | 1¼" | 19.2 | 3.6 | 2.5 | 132.5 | 38.4 | 38.4 | 48.0 | 57.6 | 76.8 | 96.0 |
| Plössl | 20 | 50 | 1¼" | 24.0 | 2.9 | 2.0 | 106.9 | 48.0 | 48.0 | 60.0 | 72.0 | 96.0 | 120.0 |
| Plössl | 15 | 50 | 1¼" | 32.0 | 2.2 | 1.5 | 78.8 | 64.0 | 64.0 | 80.0 | 96.0 | 128.0 | 160.0 |
| Plössl | 11 | 50 | 1¼" | 43.6 | 1.6 | 1.1 | 56.9 | 87.3 | 87.3 | 109.1 | 130.9 | 174.5 | 218.2 |
| Plössl | 8 | 50 | 1¼" | 60.0 | 1.2 | 0.8 | 40.6 | 120.0 | 120.0 | 150.0 | 180.0 | 240.0 | 300.0 |
| Radian | 18 | 60 | 1¼" | 26.7 | 2.6 | 2.2 | 114.4 | 53.3 | 53.3 | 66.7 | 80.0 | 106.7 | 133.3 |
| Radian | 14 | 60 | 1¼" | 34.3 | 2.0 | 1.7 | 90.0 | 68.6 | 68.6 | 85.7 | 102.9 | 137.1 | 171.4 |
| Radian | 12 | 60 | 1¼" | 40.0 | 1.8 | 1.5 | 78.8 | 80.0 | 80.0 | 100.0 | 120.0 | 160.0 | 200.0 |
| Radian | 10 | 60 | 1¼" | 48.0 | 1.5 | 1.3 | 65.6 | 96.0 | 96.0 | 120.0 | 144.0 | 192.0 | 240.0 |
| Radian | 8 | 60 | 1¼" | 60.0 | 1.2 | 1.0 | 51.9 | 120.0 | 120.0 | 150.0 | 180.0 | 240.0 | 300.0 |
| Radian | 6 | 60 | 1¼" | 80.0 | 0.9 | 0.8 | 39.4 | 160.0 | 160.0 | 200.0 | 240.0 | 320.0 | 400.0 |
| Radian | 5 | 60 | 1¼" | 96.0 | 0.7 | 0.6 | 33.1 | 192.0 | 192.0 | 240.0 | 288.0 | 384.0 | 480.0 |
| Radian | 4 | 60 | 1¼" | 120.0 | 0.6 | 0.5 | 26.3 | 240.0 | 240.0 | 300.0 | 360.0 | 480.0 | 600.0 |
| Radian | 3 | 60 | 1¼" | 160.0 | 0.4 | 0.4 | 20.6 | 320.0 | 320.0 | 400.0 | 480.0 | 640.0 | 800.0 |
| Panoptic | 41 | 68 | 2" | 11.7 | 6.0 | 5.5 | 287.5 | -- | 23.4 | -- | -- | 46.8 | -- |
| Panoptic | 35 | 68 | 2" | 13.7 | 5.1 | 4.6 | 241.9 | -- | 27.4 | -- | -- | 54.9 | -- |
| Panoptic | 27 | 68 | 2" | 17.8 | 3.9 | 3.6 | 190.6 | -- | 35.6 | -- | -- | 71.1 | -- |
| Panoptic | 24 | 68 | 1¼" | 20.0 | 3.5 | 3.2 | 168.8 | 40.0 | 40.0 | 50.0 | 60.0 | 80.0 | 100.0 |
| Panoptic | 22 | 68 | 2" & 1¼" | 21.8 | 3.2 | 3.0 | 156.3 | 43.6 | 43.6 | 54.5 | 65.5 | 87.3 | 109.1 |
| Panoptic | 19 | 68 | 1¼" | 25.3 | 2.8 | 2.5 | 133.1 | 50.5 | 50.5 | 63.2 | 75.8 | 101.1 | 126.3 |
| Panoptic | 15 | 68 | 1¼" | 32.0 | 2.2 | 2.0 | 106.9 | 64.0 | 64.0 | 80.0 | 96.0 | 128.0 | 160.0 |
| Nagler 5 | 31 | 82 | 2" | 15.5 | 4.5 | 5.0 | 262.5 | -- | 31.0 | -- | -- | 61.9 | -- |
| Nagler 5 | 26 | 82 | 2" | 18.5 | 3.8 | 4.2 | 218.8 | -- | 36.9 | -- | -- | 73.8 | -- |
| Nagler 4 | 22 | 82 | 2" | 21.8 | 3.2 | 3.7 | 194.4 | -- | 43.6 | -- | -- | 87.3 | -- |
| Nagler 5 | 20 | 82 | 2" | 24.0 | 2.9 | 3.3 | 171.3 | -- | 48.0 | -- | -- | 96.0 | -- |
| Nagler 4 | 17 | 82 | 2" | 28.2 | 2.5 | 2.9 | 151.9 | -- | 56.5 | -- | -- | 112.9 | -- |
| Nagler 5 | 16 | 82 | 1¼" | 30.0 | 2.3 | 2.6 | 138.1 | 60.0 | 60.0 | 75.0 | 90.0 | 120.0 | 150.0 |
| Nagler 6 | 13 | 82 | 1¼" | 36.9 | 1.9 | 2.1 | 110.0 | 73.8 | 73.8 | 92.3 | 110.8 | 147.7 | 184.6 |
| Nagler 4 | 12 | 82 | 2" & 1¼" | 40.0 | 1.8 | 2.0 | 106.9 | 80.0 | 80.0 | 100.0 | 120.0 | 160.0 | 200.0 |
| Nagler 6 | 11 | 82 | 1¼" | 43.6 | 1.6 | 1.8 | 93.1 | 87.3 | 87.3 | 109.1 | 130.9 | 174.5 | 218.2 |
| Nagler 6 | 9 | 82 | 1¼" | 53.3 | 1.3 | 1.5 | 77.5 | 106.7 | 106.7 | 133.3 | 160.0 | 213.3 | 266.7 |
| Nagler 6 | 7 | 82 | 1¼" | 68.6 | 1.0 | 1.2 | 60.6 | 137.1 | 137.1 | 171.4 | 205.7 | 274.3 | 342.9 |
| Nagler 6 | 5 | 82 | 1¼" | 96.0 | 0.7 | 0.8 | 43.8 | 192.0 | 192.0 | 240.0 | 288.0 | 384.0 | 480.0 |
| Nagler | 4.8 | 82 | 1¼" | 100.0 | 0.7 | 0.8 | 41.3 | 200.0 | 200.0 | 250.0 | 300.0 | 400.0 | 500.0 |
| Nagler 6 | 3.5 | 82 | 1¼" | 137.1 | 0.5 | 0.6 | 30.0 | 274.3 | 274.3 | 342.9 | 411.4 | 548.6 | 685.7 |
| Nagler 6 | 2.5 | 82 | 1¼" | 192.0 | 0.4 | 0.4 | 21.3 | 384.0 | 384.0 | 480.0 | 576.0 | 768.0 | 960.0 |
| Nagler | 7 | 82 | 1¼" | 68.6 | 1.0 | 1.1 | 58.8 | 137.1 | 137.1 | 171.4 | 205.7 | 274.3 | 342.9 |
| Nagler Zoom | 2 - 4 | 50 | 1¼" | 240.0 - 120.0 | 0.3 - 0.6 | 0.2 - 0.4 | 10.6 - 20.6 | 480.0 - 240.0 | 480.0 - 240.0 | 600.0 - 300.0 | 720.0 - 360.0 | 960.0 - 480.0 | 1,200.0 - 600.0 |
| Nagler Zoom | 3 - 6 | 50 | 1¼" | 160.0 - 80.0 | 0.4 - 0.9 | 0.3 - 0.6 | 16.3 - 31.9 | 320.0 - 160.0 | 320.0 - 160.0 | 400.0 - 200.0 | 480.0 - 240.0 | 640.0 - 320.0 | 800.0 - 400.0 |
| Click Stop Zoom | 8 - 24 | 55 - 40 | 1¼" | 60.0 - 20.0 | 1.2 - 3.5 | 0.9 - 2.0 | 47.5 - 104.4 | 120.0 - 40.0 | 120.0 - 40.0 | 150.0 - 50.0 | 180.0 - 60.0 | 240.0 - 80.0 | 300.0 - 100.0 |