William Optics 2" Swan Series Eyepiece - 40mm
Ships by Next Business Day
Contiguous US Customers:
All items we sell ship for free within the Contiguous US. Shipping will be via the cheapest shipping method which will vary depending on the items in your order. During checkout, you may also be shown other optional faster shipping choices.
US Customers in Hawaii and Alaska:
Free shipping applies to almost all products. A few large telescopes and mounts are excluded from this free shipping offer. For these items, please contact us to obtain a shipping quote before you check out using the online shopping cart.
International Customers:
Free shipping does not apply to international orders. During check-out, you will be presented with several shipping choices and costs. However, the export of some items may be restricted outside the US due to size or manufacturer restrictions.
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.
This 5-element super-wide angle 40mm SWAN EP's panoramic views at 72 deg. FOV will leave you speechless! A premium eyepiece at a fraction of the cost its worth!
Super Wide FOV
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 flaring or ghosting on high-contrast objects.
Parfocal.
Light and Easy
Soft rubber eyecup.
Extremely long eye-relief: 28mm.
No internal reflections, kidney beaning or other distracting distortions.
Terrific Fit and Finish
High-resistance anodized black barrel.
Smooth design for no hook up in your focuser.
Threaded for use with 2" filters.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Eyepiece Series | SWAN Series |
| Focal Length | 40mm |
| Barrel Size | 2" (50.8mm) |
| Apparent Field of View (Mfg Specified) | 72° |
| Eye Relief (Designed) | 28mm |
| Filter Threads | Standard 2" Filter Thread (M48 x 0.75) |
| Coatings | Fully Multi-Coated |
| Lens Elements | 5 |
| Lens Groups | 3 |
| Blackened Lens Edges | Yes |
| Barrel Type | Tapered barrel |
| Protective Plastic Storage Container | Yes - Free Agena Eyepiece Container |
| Protective Plastic Storage Container Size | Agena 65x120mm |
| End Caps | 2 |
| Parfocal | Yes |
| Weight | 570 g |
| Hide Found a better Shipped Price on Frontend? | No |
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.
This 5-element super-wide angle 40mm SWAN EP's panoramic views at 72 deg. FOV will leave you speechless! A premium eyepiece at a fraction of the cost its worth!
Super Wide FOV
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 flaring or ghosting on high-contrast objects.
Parfocal.
Light and Easy
Soft rubber eyecup.
Extremely long eye-relief: 28mm.
No internal reflections, kidney beaning or other distracting distortions.
Terrific Fit and Finish
High-resistance anodized black barrel.
Smooth design for no hook up in your focuser.
Threaded for use with 2" filters.
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Eyepiece Series | SWAN Series |
| Focal Length | 40mm |
| Barrel Size | 2" (50.8mm) |
| Apparent Field of View (Mfg Specified) | 72° |
| Eye Relief (Designed) | 28mm |
| Filter Threads | Standard 2" Filter Thread (M48 x 0.75) |
| Coatings | Fully Multi-Coated |
| Lens Elements | 5 |
| Lens Groups | 3 |
| Blackened Lens Edges | Yes |
| Barrel Type | Tapered barrel |
| Protective Plastic Storage Container | Yes - Free Agena Eyepiece Container |
| Protective Plastic Storage Container Size | Agena 65x120mm |
| End Caps | 2 |
| Parfocal | Yes |
| Weight | 570 g |
| Hide Found a better Shipped Price on Frontend? | No |
William Optics 2" Swan Series Eyepiece - 40mm