Long Perng 1.25" 80º Wide Angle Lanthanum Eyepiece - 4mm
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.
- Wide-field 4mm focal length with an 80-degree apparent field of view for immersive and panoramic views of the night sky
- Includes a high-index and low-dispersion lanthanum glass element to minimize chromatic aberration and improve image color
- Long 20mm eye relief and large 30.5mm eye lens for a comfortable viewing experience
- Rubber-coated aluminum body with 1.25" tapered barrel and fully multi-coated optics
The Long Perng 4mm 80-degree Lanthanum eyepiece delivers an immersive and panoramic visual observing experience. With 8 elements in 5 groups including a premium lanthanum glass element, this ocular offers an wide and flat field of view along with superb correction of chromatic and spherical aberration. All glass in this eyepiece is fully multi-coated to ensure you enjoy high contrast, image clarity, and natural color rendering. It’s ideal for high-magnification deep-sky observing and is suitable for planetary and lunar observing as well.
This wide-angle lanthanum eyepiece features a long 20mm eye relief, large enough even if you wear eyeglasses while observing. And with a large 30.5mm-diameter eye lens, it’s easy and enjoyable to use this eyepiece with minimal eye strain during long observing sessions. The attractive red-and-black housing is made of aluminum coated with rubber to make it easy and comfortable to handle. It also features a tapered barrel to minimize the chance of slippage when not completely secure in the focuser.
Note: The barrel of the 1.25” Long Perng Wide Angle Lanthanum eyepieces are threaded for M28.6x0.6 filters sold by Orion – in most cases, they should be compatible with standard 1.25” filter threads from other manufacturers. The 2” version of these eyepieces are threaded for M48x0.6 and will only accept Orion 2” filters - they will NOT accept most other 2” filters on the market.
| Manufacturer | Long Perng |
|---|---|
| Product Banner Type | sale |
| Free Shipping Graphic | Free US Shipping |
| Eyepiece Series | 80º Wide Angle Lanthanum |
| Focal Length | 4mm |
| Barrel Size | 1.25" (31.7mm) |
| Apparent Field of View (Mfg Specified) | 80° |
| Eye Relief (Designed) | 20mm |
| Filter Threads | 1.25" Filter Thread (M28.6 x 0.6) |
| Coatings | Fully Multi-Coated |
| Lens Elements | 8 |
| Lens Groups | 5 |
| Blackened Lens Edges | Yes |
| Protective Plastic Storage Container | Yes - Manufacturer Supplied |
| Protective Plastic Storage Container Size | Replacement: Agena 65x120mm |
| Height (With Eyeguard Extended) | 165mm |
| Maximum Width | 60.2mm |
| Eye Lens Diameter | 30.5mm |
| Field Stop Diameter | 33.4mm |
| Rubber Eye Guard | Yes |
| Weight | 544 g / 19.2 oz |
| Misc. Information |
|
| Hide Found a better Shipped Price on Frontend? | No |
- Wide-field 4mm focal length with an 80-degree apparent field of view for immersive and panoramic views of the night sky
- Includes a high-index and low-dispersion lanthanum glass element to minimize chromatic aberration and improve image color
- Long 20mm eye relief and large 30.5mm eye lens for a comfortable viewing experience
- Rubber-coated aluminum body with 1.25" tapered barrel and fully multi-coated optics
The Long Perng 4mm 80-degree Lanthanum eyepiece delivers an immersive and panoramic visual observing experience. With 8 elements in 5 groups including a premium lanthanum glass element, this ocular offers an wide and flat field of view along with superb correction of chromatic and spherical aberration. All glass in this eyepiece is fully multi-coated to ensure you enjoy high contrast, image clarity, and natural color rendering. It’s ideal for high-magnification deep-sky observing and is suitable for planetary and lunar observing as well.
This wide-angle lanthanum eyepiece features a long 20mm eye relief, large enough even if you wear eyeglasses while observing. And with a large 30.5mm-diameter eye lens, it’s easy and enjoyable to use this eyepiece with minimal eye strain during long observing sessions. The attractive red-and-black housing is made of aluminum coated with rubber to make it easy and comfortable to handle. It also features a tapered barrel to minimize the chance of slippage when not completely secure in the focuser.
Note: The barrel of the 1.25” Long Perng Wide Angle Lanthanum eyepieces are threaded for M28.6x0.6 filters sold by Orion – in most cases, they should be compatible with standard 1.25” filter threads from other manufacturers. The 2” version of these eyepieces are threaded for M48x0.6 and will only accept Orion 2” filters - they will NOT accept most other 2” filters on the market.
| Manufacturer | Long Perng |
|---|---|
| Product Banner Type | sale |
| Free Shipping Graphic | Free US Shipping |
| Eyepiece Series | 80º Wide Angle Lanthanum |
| Focal Length | 4mm |
| Barrel Size | 1.25" (31.7mm) |
| Apparent Field of View (Mfg Specified) | 80° |
| Eye Relief (Designed) | 20mm |
| Filter Threads | 1.25" Filter Thread (M28.6 x 0.6) |
| Coatings | Fully Multi-Coated |
| Lens Elements | 8 |
| Lens Groups | 5 |
| Blackened Lens Edges | Yes |
| Protective Plastic Storage Container | Yes - Manufacturer Supplied |
| Protective Plastic Storage Container Size | Replacement: Agena 65x120mm |
| Height (With Eyeguard Extended) | 165mm |
| Maximum Width | 60.2mm |
| Eye Lens Diameter | 30.5mm |
| Field Stop Diameter | 33.4mm |
| Rubber Eye Guard | Yes |
| Weight | 544 g / 19.2 oz |
| Misc. Information |
|
| Hide Found a better Shipped Price on Frontend? | No |
Long Perng 1.25" 80º Wide Angle Lanthanum Eyepiece - 4mm # E4W-CU01