Masuyama 2" Eyepiece with 53° AFOV - 50mm
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.
Ultra-premium Masuyama eyepieces were offered briefly in the mid-1980s before going out of production a few years later. Since then, these legendary eyepieces have only been available - fleetingly - on the resale market. Now, after nearly 30 years, Masuyama eyepieces are back in production and updated with modern glass and multi-coating technology.
Coveted for their clean, high-contrast views on velvet-black backgrounds, Masuyama eyepieces incorporate a five-element "hybrid Plossl" design. They have much better performance towards the edge of the field and improved color performance compared to Plossls and other competing designs. Masuyama eyepieces achieve high contrast through a much smoother polish than nearly all premium eyepieces and through superior internal baffling in their long bodies.
The eyepieces are the signature design of the renowned optician Dr. Masuyama who designed many of the finest Japanese eyepieces of the 1960s and 1970s. Dr. Masuyama even designed the 100 mm focal-length eyepiece used for visual observing at the historic 60" telescope at Mount Wilson Observatory in California.
This 50mm focal-length Masuyama eyepiece with 2" barrel makes an ideal match for long focal ratio telescopes. With a 53-degree apparent field of view, this eyepiece offers superb contrast for observing the Moon, planets, double stars, and deep-sky objects. When their rubber grips are removed, a pair of these Masuyama eyepieces can also fit in many 2" binoviewers.
- Legendary Masuyama eyepiece with 50mm focal length and 2" barrel
- Incorporates latest glass and multi-coating technology
- Provides ultra-high-contrast views of the Moon, planets, and deep-sky objects
- Ideal for long focal ratio telescopes
- 142 mm long and weighs 570 g (1 lb - 4.3 oz)
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Eyepiece Series | Masuyama 46°-53° |
| Focal Length | 50mm |
| Barrel Size | 2" (50.8mm) |
| Apparent Field of View (Mfg Specified) | 53° |
| Eye Relief (Designed) | 40mm |
| 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 | Smooth sided |
| Protective Plastic Storage Container | Yes - Free Agena Eyepiece Container |
| Protective Plastic Storage Container Size | Agena 85x120mm |
| Height (With Eyeguard Extended) | 142mm |
| Maximum Width | 71mm with rubber grip; 60mm without it |
| End Caps | 2 |
| Field Stop Diameter | 47.0mm |
| Rubber Eye Guard | Yes |
| Warranty | One year |
| Weight | 20.3 oz / 570 g |
| Country of Manufacture | Japan |
| Hide Found a better Shipped Price on Frontend? | No |
Ultra-premium Masuyama eyepieces were offered briefly in the mid-1980s before going out of production a few years later. Since then, these legendary eyepieces have only been available - fleetingly - on the resale market. Now, after nearly 30 years, Masuyama eyepieces are back in production and updated with modern glass and multi-coating technology.
Coveted for their clean, high-contrast views on velvet-black backgrounds, Masuyama eyepieces incorporate a five-element "hybrid Plossl" design. They have much better performance towards the edge of the field and improved color performance compared to Plossls and other competing designs. Masuyama eyepieces achieve high contrast through a much smoother polish than nearly all premium eyepieces and through superior internal baffling in their long bodies.
The eyepieces are the signature design of the renowned optician Dr. Masuyama who designed many of the finest Japanese eyepieces of the 1960s and 1970s. Dr. Masuyama even designed the 100 mm focal-length eyepiece used for visual observing at the historic 60" telescope at Mount Wilson Observatory in California.
This 50mm focal-length Masuyama eyepiece with 2" barrel makes an ideal match for long focal ratio telescopes. With a 53-degree apparent field of view, this eyepiece offers superb contrast for observing the Moon, planets, double stars, and deep-sky objects. When their rubber grips are removed, a pair of these Masuyama eyepieces can also fit in many 2" binoviewers.
- Legendary Masuyama eyepiece with 50mm focal length and 2" barrel
- Incorporates latest glass and multi-coating technology
- Provides ultra-high-contrast views of the Moon, planets, and deep-sky objects
- Ideal for long focal ratio telescopes
- 142 mm long and weighs 570 g (1 lb - 4.3 oz)
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Eyepiece Series | Masuyama 46°-53° |
| Focal Length | 50mm |
| Barrel Size | 2" (50.8mm) |
| Apparent Field of View (Mfg Specified) | 53° |
| Eye Relief (Designed) | 40mm |
| 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 | Smooth sided |
| Protective Plastic Storage Container | Yes - Free Agena Eyepiece Container |
| Protective Plastic Storage Container Size | Agena 85x120mm |
| Height (With Eyeguard Extended) | 142mm |
| Maximum Width | 71mm with rubber grip; 60mm without it |
| End Caps | 2 |
| Field Stop Diameter | 47.0mm |
| Rubber Eye Guard | Yes |
| Warranty | One year |
| Weight | 20.3 oz / 570 g |
| Country of Manufacture | Japan |
| Hide Found a better Shipped Price on Frontend? | No |
Masuyama 2" Eyepiece with 53° AFOV - 50mm # MOP-50