Tele Vue 48mm Filter Adapter for 2.4"

A Secure, Large-Format 2.4" Connection

Unlike standard 2-inch accessories that use slip-fit barrels and compression rings, the AFT-1105 threads directly onto the drawtube of Tele Vue's 2.4-inch focusers. This creates a solid, tilt-free connection that becomes part of the telescope itself. The benefit for an imager is the elimination of a potential source of flexure, ensuring your camera and filters remain perfectly orthogonal to the light path throughout an imaging session.

Universal M48 Filter Compatibility

The male threading on the adapter is a standard M48x0.75, which is the universal specification for 2-inch mounted astronomical filters. This ensures compatibility with your entire collection of filters, from broadband light pollution models to the narrowest of narrowband filters. You can easily switch between a Hydrogen-alpha filter for nebulae and a UV/IR cut filter for broadband targets without changing your core setup.

Engineered to Preserve Back Focus

Every millimeter of back focus is critical in a modern imaging train. The AFT-1105 is designed with an ultra-low 6.4mm profile to add the least possible optical length to your system. Its function is to hold a filter, not act as a spacer. This lean design is a key advantage, as it leaves maximum room for other essential components like off-axis guiders, rotators, and camera-specific adapters.

The primary trade-off for this streamlined design is its singular purpose. This adapter is not a spacer and is intended for one filter at a time. For imagers who need to switch between multiple filters automatically, a filter wheel would be the more appropriate, albeit more back-focus-intensive, solution.

Durable, Anti-Reflection Construction

Machined from a single piece of aluminum and finished with a matte black anodization, the adapter is both lightweight and durable. The internal surfaces are treated to prevent reflections from stray light. This attention to detail helps maintain the high-contrast performance of your Tele Vue refractor by ensuring that no stray light bounces off the adapter and into your camera sensor, which could reduce the faint details in your images.

The Imager's Choice for Simplicity and Stability

This adapter is the right choice for an imager with a Tele Vue 2.4" system who primarily uses one filter per session, such as when capturing a single narrowband channel or shooting LRGB data over multiple nights. When you place your 7nm H-alpha filter in the AFT-1105 to capture the sprawling Cygnus Loop, you have confidence that the connection is rigid and the optical path is as short as possible. It delivers a simple, stable, and efficient way to integrate essential filters into a high-performance imaging setup.