Tele Vue Plössl 40 mm: focal length 40 mm, apparent field of view 43°, 1.25-inch thread, and eye relief 28 mm. Part number EPL-40.0.
CHF 208.00incl. Swiss VAT
Part Number EPL-40.0
The 40 mm Plössl Eyepiece is a 40-mm astronomical eyepiece offering an apparent field of 43°. It mounts on a 1.25-inch barrel and has an eye relief of 28 mm. This configuration is worth considering for star fields and extended deep-sky objects, depending on your telescope’s focal length.
The Plössl formula provides a way to design a range of magnifications without seeking an extreme apparent field of view. Pay particular attention to the eye relief: it varies with the focal length and determines the position of the eye.
| Manufacturer reference | EPL-40.0 |
|---|---|
| Family | Plössl |
| Focal length | 40 mm |
| Apparent field | 43° |
| Flow | 1.25 inches |
| Eye Discharge | 28 mm |
| Field diaphragm | 27 mm |
| Weight | 0.41 lb / 6.6 oz |
What is the magnification with this eyepiece?
With a telescope that has a focal length of 1,000 mm, this eyepiece provides approximately 25× magnification. The magnification is calculated by dividing the telescope’s focal length by that of the eyepiece.
Is it compatible with my telescope?
It uses a 1.25-inch mount. In a 2-inch eyepiece holder, a suitable adapter is required. The ability to focus also depends on the optical path of the accessories.
Can you observe things with glasses?
The advertised eye relief is 28 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 one-size-fits-all 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 43° describes the view through the eyepiece. The actual field of view depends on the telescope; the 27-mm field stop is the value to use to calculate it.
Check the focus travel, the focus adjustment range, the weight your mount can support, and the compatibility of filters or correctors. The product offered is a Tele Vue Plössl 40 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: Official Tele Vue EPL-40.0 Specifications Sheet.
