Ethos 13 mm Tele Vue: focal length 13 mm, apparent field of view 100°, 2-inch and 1.25-inch threads, and 15 mm eye relief. Part number ETH-13.0.
CHF 818.00incl. Swiss VAT
Reference ETH-13.0
The Ethos 13 mm Eyepiece is a 13-mm astronomical eyepiece offering an apparent field of 100°. It has a 2-inch and 1.25-inch thread and provides 15 mm of eye relief. This configuration is worth considering for star clusters, compact deep-sky objects, and general-purpose observing, depending on the focal length of your telescope.
The Ethos series is designed for observers who want a very wide field of view around the subject. The Ethos SX models offer an apparent field of view of 110°, compared to 100° for the other Ethos models. This apparent field of view should not be confused with the actual field of view visible through your telescope.
| Manufacturer reference | ETH-13.0 |
|---|---|
| Family | Ethos |
| Focal length | 13 mm |
| Apparent field | 100° |
| Flow | 2 and 1.25 inches |
| Eye Discharge | 15 mm |
| Field diaphragm | 22.3 mm |
| Weight | 1.3 lb / 20.8 oz |
What is the magnification with this eyepiece?
With a telescope that has a focal length of 1,000 mm, this eyepiece provides approximately 77× magnification. The magnification is calculated by dividing the telescope’s focal length by that of the eyepiece.
Is it compatible with my telescope?
The double slide allows for both of the specified formats. Check the clamping position, the focusing travel, and the clearances with your angle drive or focus adjuster.
Can you observe things with glasses?
The specified eye relief is 15 mm. Comfort when wearing glasses also depends on their shape and the position of the eye; trying them on is always better than relying on a universal guarantee. The Tele Vue chart indicates DIOPTRX compatibility; this astigmatism corrector is optional.
Is the apparent field the field visible in the sky?
No. The apparent field of view of 100° describes the view through the eyepiece. The actual field of view depends on the telescope; the field stop of 22.3 mm is the value to use to calculate it.
Check the focus travel, the focus range, the weight your setup can support, and the compatibility of filters or correctors. The product offered is a Tele Vue Ethos 13 mm eyepiece; the accessories listed are optional. The availability shown reflects our supplier’s status at the time of the last check and does not indicate a reserved quantity.
Features and Compatibility: Tele Vue ETH-13.0 Official Product Sheet.
