Best 1.25 Eyepiece Extension Tubes for Telescopes and Astrophotography
Exploring the night sky often requires precise spacing between your eyepiece and camera or sensor. A 1.25 inch eyepiece extension tube adds length to the light path, helping achieve proper focus, enhanced framing, and the option to use 1.25″ filters. This guide reviews top 1.25″ extension tubes designed for durability, compatibility, and easy operation.
The following table highlights five featured products chosen for relevance, build quality, and compatibility with standard 1.25″ accessories. Use this quick reference to compare lengths, materials, and key features before selecting the best fit for your setup.
| Product | Brand | Length / Extension | Material | Notes |
|---|---|---|---|---|
| SVBONY SV157 Extension Tube | SVBONY | 70mm total length (40mm optical) | All-metal | Long reach; accepts 1.25″ filters |
| SVBONY SV157 34mm Extension Tube | SVBONY | 34mm optical length | Aluminum | Compact option; threaded for 1.25″ filters |
| Alstar T2-Extension Tube Kit | A ALSTAR | 8mm, 10mm, 20mm, 40mm (T2 threads) | All metal; anodized aluminium | Expandable with multiple pieces |
| Astromania Upgraded Telescope Camera Adapter | Astromania | 34mm scales; variable projection | Anodized aluminum | Focal plane and eyepiece projection capable |
| Farpoint 1.25″ Eyepiece Extension Tube, 2.25″ Long | Farpoint | 2.25″ long | Metal (USA built) | Simple, sturdy extension for eyepiece focus |
SVBONY SV157 Extension Tube 70mm
The SV157 1.25″ extension tube provides a full-metal build designed to maintain alignment and durability. It adds optical length (40mm) and total length (70mm), aiding focused views and enabling use of standard 1.25″ filters. Compatible with typical 1.25″ accessories, this extension tube is ideal for users seeking robust performance and extended focus control.
SVBONY SV157 34mm Extension Tube
This compact 1.25″ extension tube offers a 34mm optical length with an aluminum construction. It threads to accommodate standard 1.25″ filters and includes locking thumbscrews to secure eyepieces or accessories. The design emphasizes ease of use and reliable alignment for routine observing and short-exposure imaging.
Alstar T2-Extension Tube Kit
The Alstar T2-Extension Tube Kit offers modular extension rings at 8mm, 10mm, 20mm, and 40mm lengths with T2 threads on both sides. This all-metal set enables flexible spacing for precise focusing and custom spacing in astrophotography. Anodized aluminum construction enhances longevity for frequent use with cameras and eyepieces.
Astromania Variable Projection Adapter
This 1.25″ extension kit from Astromania is designed for focal plane and eyepiece projection imaging. Featuring anodized aluminum, it provides stable, precise extension with 34mm scale values for accurate focal length adjustments. It suits refractors and reflectors alike, serving beginners and enthusiasts who want immediate imaging capabilities.
Farpoint 1.25″ Eyepiece Extension Tube, 2.25″ Long
Farpoint’s 2.25″ long 1.25″ eyepiece extension tube is made in the USA and designed for straightforward extension of the light path. It enables additional spacing for focusing accuracy and compatibility with standard 1.25″ eyepieces and accessories, delivering dependable performance for observational use and basic imaging setups.
Farpoint 1.25″ Eyepiece Focuser Extension Tube
This 1.25″ extension tube from Farpoint offers a compact, USA-made option (FAV102) for extending the eyepiece-to-focus distance. Known for reliable performance in amateur astronomy kits, it supports standard focuser setups and simple installation for everyday use.
Bloepum 1.25 Inch Extension Tube
Bloepum’s aluminum extension tube with a brass compression ring provides a sturdy 1.25″ extension option. The black anodized finish helps resist wear, while the brass ring reduces marring of telescope optics. It supports 1.25″ eyepieces and filters, offering a durable, cost-effective accessory for entry- to mid-level setups.
Celticbird 1.25″ Universal Camera Adapter Extension
The Celticbird 1.25″ universal camera adapter lets you attach a T-ring equipped DSLR or SLR camera directly to a telescope. It supports prime-focus and eyepiece-projection photography for both refractors and reflectors. The unit slides into a 1.25″ focuser with T-threads for camera attachment, simplifying imaging workflows for novices and seasoned astronomers alike.
Buying Guide
- Compatibility: Check that the tube threads match your focusers and filters (most listed use 1.25″ standard). Confirm T-threads if you plan camera attachments.
- Length options: Shorter tubes help on-tight focusers; longer tubes increase spacing for focus shift, vignetting management, and compatibility with protruding eyepieces.
- Material and build: All-metal and anodized aluminum designs provide durability and consistent performance under night air conditions.
- Filter readiness: If you plan to use 1.25″ filters, ensure the end is threaded to accept standard 1.25″ filters.
- Modularity: Kits with multiple short pieces (like 8/10/20/40mm) allow precise spacing for diverse optical configurations and imaging setups.
- Applicant use case: Prioritize simple focus adjustments for observing; opt for variable projection adapters if you plan eyepiece projection imaging.
- Cost-to-value: Aluminum extension tubes with reliable locking mechanisms offer good longevity; consider a hardened finish for frequent transport and field use.
- Accessory ecosystem: If you anticipate adding a camera, ensure compatibility with T-rings, cameras, and accessories in your kit.
In summary, 1.25″ eyepiece extension tubes improve focusing flexibility, enable filter usage, and support a broader range of astrophotography and observing scenarios. When selecting, evaluate length, build quality, thread compatibility, and whether a modular kit best fits your evolving telescope setup.