Masuyama 2" Eyepiece with 53° AFOV - 45mm
Stock count is accurate & shown in real time.
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available.
- This item is out of stock.
- We have no ETA from the manufacturer at this time.
- Sign up for back-in-stock alerts to be notified when this item becomes available.
Lower 48 States:
Orders over $50 ship free within the Lower 48 using a carrier and service we select based on your items and delivery location. Faster shipping options may be available at checkout.
U.S. Outside the Lower 48 (AK, HI, PR):
Free shipping on orders over $50 applies to many—but not all—items. Add items to your cart and enter your ZIP code to see available shipping options and any costs.
International Orders:
Free shipping does not apply to international orders. You’ll see available shipping options and costs during checkout. Some items can’t be shipped internationally due to size or manufacturer restrictions. Duties, taxes, brokerage fees, and tariffs are not included and are the customer’s responsibility.
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 45mm 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 45mm 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
- 128 mm long and weighs 508g (1 lb - 1.9 oz)
Other Information
- Country of Manufacture: Japan
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 45mm 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 45mm 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
- 128 mm long and weighs 508g (1 lb - 1.9 oz)
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 45mm 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 45mm 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
- 128 mm long and weighs 508g (1 lb - 1.9 oz)
Other Information
- Country of Manufacture: Japan
| Free Shipping Graphic | Free US Shipping |
|---|---|
| Eyepiece Series | Masuyama 46°-53° |
| Focal Length | 45mm |
| Barrel Size | 2" (50.8mm) |
| Apparent Field of View (Mfg Specified) | 53° |
| Eye Relief (Designed) | 32mm |
| 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) | 128mm |
| Maximum Width | 71mm with rubber grip; 60mm without it |
| End Caps | 2 |
| Field Stop Diameter | 40mm |
| Rubber Eye Guard | Yes |
| Warranty | One year |
| Weight | 17.9 oz / 508 g |
| Country of Manufacture | Japan |
| Hide Found a better Shipped Price on Frontend? | No |
Masuyama 2" Eyepiece with 53° AFOV - 45mm