This eyepiece seems to give mediocre performance, including relatively low image brightness. Note that the eyepiece has a slightly longer focal length than advertised. We recommend using the 26.6 mm eyepiece for unfiltered observing, and the Sirius for mounting filters.
Cahill Rooftop Observatory
Equipment Database - Orion Sirius Plössl 25mm
| Orion Sirius Plössl 25mm | |
|---|---|
| Optical Design | Plössl |
| Barrel Size | 1.25" |
| Threaded for Filters | Yes |
| Focal Length | 26.0 mm |
| Field Stop | 23.0 mm |
| Apparent FOV | 51° |
| Eye Relief | 14 mm |
Usable on:
- Celestron 14-inch
- Celestron 10-inch
- Celestron 8-inch
- Questar
- Galileoscope