The Swan eyepieces are super wide angle designs with a 72° apparent
field of view. They use simple but sophisticated five-lens optical
systems for generally higher contrast than the more complicated optical
designs used in some other super wide angle eyepieces that use up to
eight lenses. All lenses are fully multicoated for high light
transmission. Lens edges and internal field stops are blackened to
reduce internal reflections and improve contrast. The eyepiece rubber
grip ring is useful for safer handling of the heavier 2” eyepieces in
cold weather when wearing gloves. The eyepieces have soft roll down
rubber eyecups for eyeglass use. They can be used for all types of
observing, with all telescope types, but they are recommended for use
with focal ratios up to f/6 and above. Dust caps are provided for both
ends of each eyepiece. A soft protective drawstring-equipped velvet
storage bag is standard equipment with each.
With any focal length telescope, this great 25mm all-around eyepiece will not let you down! The incredibly wide 72 deg. FOV makes it perfect for low-power rich-field viewing.
A great optical achievement!
Spectacular Images!
• Outstanding super-wide field of view: 72 deg. FOV
• Fully Multicoated lenses for excellent transmittance.
• Outstanding chromatic aberration correction.
• Sharp and well contrasted.
Great Contrast
• Internally fully blackened (lens edges and internal spacers).
• No internal reflections
• No flaring or ghosting on high-contrast objects.
• Parfocal.
Light and Easy
• Soft rubber eyecup.
• Extremely long eye-relief: 25 mm.
• No internal reflections Terrific Fit and Finish
• High-resistance anodized black barrel.
• Smooth design for no hook up in your focuser.
• Threaded for 2” filters.
| Model | SWAN 25 |
| Focal Length | 25mm |
| Lens Structure (#Elements/#Groups) | 5/3 |
| Field of View | 72° |
| Eye Relief | 21mm |
| Barrel | 2" |
| Coating | FMC
|
| Parfocal | Yes |
| Weight | 330g |
If you have any comments or reviews you'd like to share with us, please email us. Thank you. |
