| Meade-ETX90 (90mm) Mak-Cass 1250mmFL @f/13.8 |
| 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" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Plössl | 40 | 43 | 1¼" | 31.3 | 2.9 | 1.2 | 64.8 | 62.5 | 62.5 | 78.1 | 93.8 | 125.0 | 156.3 |
| Plössl | 32 | 50 | 1¼" | 39.1 | 2.3 | 1.2 | 64.8 | 78.1 | 78.1 | 97.7 | 117.2 | 156.3 | 195.3 |
| Plössl | 25 | 50 | 1¼" | 50.0 | 1.8 | 1.0 | 50.9 | 100.0 | 100.0 | 125.0 | 150.0 | 200.0 | 250.0 |
| Plössl | 20 | 50 | 1¼" | 62.5 | 1.4 | 0.8 | 41.0 | 125.0 | 125.0 | 156.3 | 187.5 | 250.0 | 312.5 |
| Plössl | 15 | 50 | 1¼" | 83.3 | 1.1 | 0.6 | 30.2 | 166.7 | 166.7 | 208.3 | 250.0 | 333.3 | 416.7 |
| Plössl | 11 | 50 | 1¼" | 113.6 | 0.8 | 0.4 | 21.8 | 227.3 | 227.3 | 284.1 | 340.9 | 454.5 | 568.2 |
| Plössl | 8 | 50 | 1¼" | 156.3 | 0.6 | 0.3 | 15.6 | 312.5 | 312.5 | 390.6 | 468.8 | 625.0 | 781.3 |
| Radian | 18 | 60 | 1¼" | 69.4 | 1.3 | 0.8 | 43.9 | 138.9 | 138.9 | 173.6 | 208.3 | 277.8 | 347.2 |
| Radian | 14 | 60 | 1¼" | 89.3 | 1.0 | 0.7 | 34.6 | 178.6 | 178.6 | 223.2 | 267.9 | 357.1 | 446.4 |
| Radian | 12 | 60 | 1¼" | 104.2 | 0.9 | 0.6 | 30.2 | 208.3 | 208.3 | 260.4 | 312.5 | 416.7 | 520.8 |
| Radian | 10 | 60 | 1¼" | 125.0 | 0.7 | 0.5 | 25.2 | 250.0 | 250.0 | 312.5 | 375.0 | 500.0 | 625.0 |
| Radian | 8 | 60 | 1¼" | 156.3 | 0.6 | 0.4 | 19.9 | 312.5 | 312.5 | 390.6 | 468.8 | 625.0 | 781.3 |
| Radian | 6 | 60 | 1¼" | 208.3 | 0.4 | 0.3 | 15.1 | 416.7 | 416.7 | 520.8 | 625.0 | 833.3 | 1,041.7 |
| Radian | 5 | 60 | 1¼" | 250.0 | 0.4 | 0.2 | 12.7 | 500.0 | 500.0 | 625.0 | 750.0 | 1,000.0 | 1,250.0 |
| Radian | 4 | 60 | 1¼" | 312.5 | 0.3 | 0.2 | 10.1 | 625.0 | 625.0 | 781.3 | 937.5 | 1,250.0 | 1,562.5 |
| Radian | 3 | 60 | 1¼" | 416.7 | 0.2 | 0.2 | 7.9 | 833.3 | 833.3 | 1,041.7 | 1,250.0 | 1,666.7 | 2,083.3 |
| Panoptic | 41 | 68 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Panoptic | 35 | 68 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Panoptic | 27 | 68 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Panoptic | 24 | 68 | 1¼" | 52.1 | 1.7 | 1.2 | 64.8 | 104.2 | 104.2 | 130.2 | 156.3 | 208.3 | 260.4 |
| Panoptic | 22 | 68 | 2" & 1¼" | 56.8 | 1.6 | 1.1 | 60.0 | 113.6 | 113.6 | 142.0 | 170.5 | 227.3 | 284.1 |
| Panoptic | 19 | 68 | 1¼" | 65.8 | 1.4 | 1.0 | 51.1 | 131.6 | 131.6 | 164.5 | 197.4 | 263.2 | 328.9 |
| Panoptic | 15 | 68 | 1¼" | 83.3 | 1.1 | 0.8 | 41.0 | 166.7 | 166.7 | 208.3 | 250.0 | 333.3 | 416.7 |
| Nagler 5 | 31 | 82 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Nagler 5 | 26 | 82 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Nagler 4 | 22 | 82 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Nagler 5 | 20 | 82 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Nagler 4 | 17 | 82 | 2" | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Nagler 5 | 16 | 82 | 1¼" | 78.1 | 1.2 | 1.0 | 53.0 | 156.3 | 156.3 | 195.3 | 234.4 | 312.5 | 390.6 |
| Nagler 6 | 13 | 82 | 1¼" | 96.2 | 0.9 | 0.8 | 42.2 | 192.3 | 192.3 | 240.4 | 288.5 | 384.6 | 480.8 |
| Nagler 4 | 12 | 82 | 2" & 1¼" | 104.2 | 0.9 | 0.8 | 41.0 | 208.3 | 208.3 | 260.4 | 312.5 | 416.7 | 520.8 |
| Nagler 6 | 11 | 82 | 1¼" | 113.6 | 0.8 | 0.7 | 35.8 | 227.3 | 227.3 | 284.1 | 340.9 | 454.5 | 568.2 |
| Nagler 6 | 9 | 82 | 1¼" | 138.9 | 0.6 | 0.6 | 29.8 | 277.8 | 277.8 | 347.2 | 416.7 | 555.6 | 694.4 |
| Nagler 6 | 7 | 82 | 1¼" | 178.6 | 0.5 | 0.4 | 23.3 | 357.1 | 357.1 | 446.4 | 535.7 | 714.3 | 892.9 |
| Nagler 6 | 5 | 82 | 1¼" | 250.0 | 0.4 | 0.3 | 16.8 | 500.0 | 500.0 | 625.0 | 750.0 | 1,000.0 | 1,250.0 |
| Nagler | 4.8 | 82 | 1¼" | 260.4 | 0.3 | 0.3 | 15.8 | 520.8 | 520.8 | 651.0 | 781.3 | 1,041.7 | 1,302.1 |
| Nagler 6 | 3.5 | 82 | 1¼" | 357.1 | 0.3 | 0.2 | 11.5 | 714.3 | 714.3 | 892.9 | 1,071.4 | 1,428.6 | 1,785.7 |
| Nagler 6 | 2.5 | 82 | 1¼" | 500.0 | 0.2 | 0.2 | 8.2 | 1,000.0 | 1,000.0 | 1,250.0 | 1,500.0 | 2,000.0 | 2,500.0 |
| Nagler | 7 | 82 | 1¼" | 178.6 | 0.5 | 0.4 | 22.6 | 357.1 | 357.1 | 446.4 | 535.7 | 714.3 | 892.9 |
| Nagler Zoom | 2 - 4 | 50 | 1¼" | 625.0 - 312.5 | 0.1 - 0.3 | 0.1 - 0.2 | 4.1 - 7.9 | 1,250.0 - 625.0 | 1,250.0 - 625.0 | 1,562.5 - 781.3 | 1,875.0 - 937.5 | 2,500.0 - 1,250.0 | 3,125.0 - 1,562.5 |
| Nagler Zoom | 3 - 6 | 50 | 1¼" | 416.7 - 208.3 | 0.2 - 0.4 | 0.1 - 0.2 | 6.2 - 12.2 | 833.3 - 416.7 | 833.3 - 416.7 | 1,041.7 - 520.8 | 1,250.0 - 625.0 | 1,666.7 - 833.3 | 2,083.3 - 1,041.7 |
| Click Stop Zoom | 8 - 24 | 55 - 40 | 1¼" | 156.3 - 52.1 | 0.6 - 1.7 | 0.3 - 0.8 | 18.2 - 40.1 | 312.5 - 104.2 | 312.5 - 104.2 | 390.6 - 130.2 | 468.8 - 156.3 | 625.0 - 208.3 | 781.3 - 260.4 |