Blue Fireball 1.25" Spacer Ring with 0.5" Extension
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 (account login required).
- This item is out of stock.
- Sign up for back-in-stock alerts to be notified when this item becomes available (account login required).
Contiguous US / Lower 48:
Free shipping applies to orders over $50 using our chosen carrier/method. Faster paid options are available at checkout.
Alaska, Hawaii & US Territories:
Free shipping applies to many—but not all—products. Enter your ZIP code in cart or upon checkout to confirm options and costs.
International:
International orders do not qualify for free shipping. Shipping, duties, brokerage, tariffs, and taxes are the customer’s responsibility. Some items may be restricted due to export, size, or manufacturer limitations.
New version with longer threads
Description/Uses:
- 1.25" extension ring/barrel spacer
- Provides 0.5" (12.7mm) of spacing
- Allows you to securely set or vary the spacing between 1.25" components
- Useful for making eyepieces parfocal or to change the reduction factor of focal reducers
- Has standard 1.25" filter threads (male on one side and female on the other)
Features:
- Precision machined from aluminum and black anodized
- Threaded to accept standard 1.25" astronomy filters
Specifications:
- Total Length = 0.62" (15.7mm)
- Extension Provided = 0.5" (12.7mm)
- Length of External Male Thread = 0.12" (3mm)
- Thread Specification (External Thread) = M28.5x0.6 Male
- Length of Internal Female Thread = 0.39" (10mm)
- Thread Specification (Internal Thread) = M28.5x0.6 Female
- Maximum Outer Diameter = 1.25" (31.7mm)
- Weight = 0.2oz (6g)
Other Information
- Country of Manufacture: China
New version with longer threads
Description/Uses:
- 1.25" extension ring/barrel spacer
- Provides 0.5" (12.7mm) of spacing
- Allows you to securely set or vary the spacing between 1.25" components
- Useful for making eyepieces parfocal or to change the reduction factor of focal reducers
- Has standard 1.25" filter threads (male on one side and female on the other)
Features:
- Precision machined from aluminum and black anodized
- Threaded to accept standard 1.25" astronomy filters
Specifications:
- Total Length = 0.62" (15.7mm)
- Extension Provided = 0.5" (12.7mm)
- Length of External Male Thread = 0.12" (3mm)
- Thread Specification (External Thread) = M28.5x0.6 Male
- Length of Internal Female Thread = 0.39" (10mm)
- Thread Specification (Internal Thread) = M28.5x0.6 Female
- Maximum Outer Diameter = 1.25" (31.7mm)
- Weight = 0.2oz (6g)
New version with longer threads
Description/Uses:
- 1.25" extension ring/barrel spacer
- Provides 0.5" (12.7mm) of spacing
- Allows you to securely set or vary the spacing between 1.25" components
- Useful for making eyepieces parfocal or to change the reduction factor of focal reducers
- Has standard 1.25" filter threads (male on one side and female on the other)
Features:
- Precision machined from aluminum and black anodized
- Threaded to accept standard 1.25" astronomy filters
Specifications:
- Total Length = 0.62" (15.7mm)
- Extension Provided = 0.5" (12.7mm)
- Length of External Male Thread = 0.12" (3mm)
- Thread Specification (External Thread) = M28.5x0.6 Male
- Length of Internal Female Thread = 0.39" (10mm)
- Thread Specification (Internal Thread) = M28.5x0.6 Female
- Maximum Outer Diameter = 1.25" (31.7mm)
- Weight = 0.2oz (6g)
Other Information
- Country of Manufacture: China
Blue Fireball 1.25" Spacer Ring with 0.5" Extension