My Numbers
Calculations of magnification and FOV of my scopes and eyepieces.
Celestron C8-SGT (XLT)
| Focal Length: |
2032 mm |
| Aperture: |
203 mm (8 inches) |
| f Ratio: |
f/10 |
| Eye Piece |
Magnification |
AFOV |
FOV |
| William Optics 33mm SWAN |
61x |
72 degrees |
1.18 degrees |
| APM 26mm SWAN |
78x |
70 degrees |
0.89 degrees |
| Celestron 25mm E-lux Plossl |
81x |
50 degrees |
0.61 degrees |
| Televue 22mm Panoptic |
92x |
68 degrees |
0.74 degrees |
| Televue 13mm Nagler Type 1 |
156x |
82 degrees |
0.52 degrees |
| Televue 9mm Nagler Type 1 |
225x |
82 degrees |
0.36 degrees |
| Televue 7mm Nagler Type 6 |
290x |
82 degrees |
0.28 degrees |
——————————————————————
Celestron C6-SGT (XLT)
| Focal Length: |
1500 mm |
| Aperture: |
150 mm (6 inches) |
| f Ratio: |
f/10 |
| Eye Piece |
Magnification |
AFOV |
FOV |
| William Optics 33mm SWAN |
45x |
72 degrees |
1.6 degrees |
| APM 26mm SWAN |
58x |
70 degrees |
1.2 degrees |
| Celestron 25mm E-lux Plossl |
60x |
50 degrees |
0.83 degrees |
| Televue 22mm Panoptic |
68x |
68 degrees |
1 degree |
| Televue 13mm Nagler Type 1 |
115x |
82 degrees |
0.71 degrees |
| Televue 9mm Nagler Type 1 |
167x |
82 degrees |
0.49 degrees |
| Televue 7mm Nagler |
214x |
82 degrees |
0.38 degrees |
| Televue 4mm Radian |
375x |
60 degrees |
0.16 degrees |
——————————————————————
Stellarvue 80BV
| Focal Length: |
750 mm |
| Aperture: |
80 mm (3 inches) |
| f Ratio: |
f/9.4 |
| Eye Piece |
Magnification |
AFOV |
FOV |
| Celestron 25mm E-lux Plossl |
30x |
50 degrees |
1.67 degrees |
| Televue 22mm Panoptic |
37.5x |
68 degrees |
1.81 degrees |
| Televue 13mm Nagler Type 1 |
57x |
82 degrees |
1.44 degrees |
| Televue 9mm Nagler |
83x |
82 degrees |
0.98 degrees |
| Televue 7mm Nagler |
107x |
82 degrees |
0.766 degrees |
| Televue 4mm Radian |
187x |
60 degrees |
0.32 degrees |
——————————————————————
Astro-Tech AT66ED
| Focal Length: |
400 mm |
| Aperture: |
66 mm (2.5 inches) |
| f Ratio: |
f/6 |
| Eye Piece |
Magnification |
AFOV |
FOV |
| Celestron 25mm E-lux Plossl |
16x |
50 degrees |
3.13 degrees |
| AT Series 6 – 17 mm WF |
23.5x |
65 degrees |
2.8 degrees |
| AT Series 6 – 12 mm WF |
33x |
60 degrees |
1.8 degrees |
| AT Series 6 – 8 mm WF |
50x |
60 degrees |
1.2 degrees |
| Televue 7mm Nagler |
57x |
82 degrees |
1.43 degrees |
| Televue 4mm Radian |
100x |
60 degrees |
0.6 degrees |
——————————————————————
Stellarvue SV50 Finderscope
| Focal Length: |
200 mm |
| Aperture: |
50 mm |
| f Ratio: |
f/4 |
| Eye Piece |
Magnification |
AFOV |
FOV |
| 23mm Illuminated Reticle |
9x |
50 degrees |
5.55 degrees |
