The Quick-Release Lens Tube Filter Holder provided by LBTEK is suitable for filters or other optical components with a diameter of 25.4 mm (1 inch) and a thickness of 0–3.5 mm or 3.5–6.5 mm. The entire holder consists of two parts: the slotted lens tube QTFM3.5-B and the filter holder QTFMXX-A, which are quickly detached via magnetic attachment. The slotted lens tube features SM1 external and internal threads, compatible with SM1 lens tube, and includes an SM1NR locking ring to secure it in a specific rotational direction. Multiple filter holders can also be stacked for use. Note: When using, press the QTFMXX-A stainless steel nut with your right finger in the direction of the arrow, while gently pressing the center of the internal magnetic component with your left thumb and simultaneously pushing it in the direction of the arrow to open the spring-loaded clamp. Then, release your left thumb to insert the optical component, ensuring it is tangent to the two cylindrical pins, before releasing the stainless steel nut.

The Slotted Lens Tube QTFM3.5-B provided by LBTEK is for filter holders QTFM3.5-A and QTFM6.3-A. Featuring SM1 internal and external threads, it can be used in a stacked configuration. The product consists of a lens tube and an SM1NR locking ring, allowing flexible adjustment of the position and rotation angle of connected components along the optical axis. The SM1NR is used to secure the position of connected components.