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.
The 40mm is a huge-lens rich-field eyepiece at a very reasonable price!
Fully multicoated advanced design for breathtaking 72 deg. FOV providing jaw-dropping views.
Try it out on the Milky Way!
A True Spacewalker!
• Marvelous 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 flaring or ghosting on high-contrast objects.
• Parfocal.
Ease of Use
• Soft rubber eyecup.
• Extremely long eye-relief: 28 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 40 |
| Focal Length | 40mm |
| Lens Structure (#Elements/#Groups) | 5/3 |
| Field of View | 72° |
| Eye Relief | 28mm |
| Barrel | 2" |
| Coating | FMC
|
| Parfocal | Yes |
| Weight | 570g |
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