Svbony SV226 filter drawer, 21mm thickness

This compact filter drawer adapts a telescope to accept 1.25" and 2" filters quickly and securely, making it easier to switch between narrowband and broadband imaging during a night of deep sky work. Designed to plug between a focal reducer and the camera, this accessory helps manage filter swaps without repeated thread mounting, which can save time when capturing faint nebulae.

Key Points

The drawer uses a double pair of magnets for a quick, tool-free hold that replaces traditional screw rotation, according to the manufacturer. It accepts both 1.25" and 2" filter holders so existing filter collections can be reused, reducing additional expense for different sizes. CNC integrated moulding aims to give dimensional precision and consistent performance, which matters when maintaining optical alignment. A locking screw lets you adjust tension to eliminate play, adding a secondary mechanical safety. Note that the drawer thickness influences back focus, and this can limit some accessories or modify the optical path for certain camera and reducer combinations. 🛰️

Technical Specifications

• Name: SVBONY SV226
• Filter holder sizes: 1.25" and 2"
• Thread adapter: M42 to M48, male camera side and female filter side
• Drawer thickness: 21 mm
• Mounting: magnetic latch with locking screw

Benefits

Because the unit supports two common filter diameters, astrophotography setups gain flexibility and lower ongoing costs, especially for beginners building their first filter set. The magnetic system simplifies handling in low-light conditions, making filter changes faster and less fiddly. Precision CNC construction reduces the risk of misalignment between filters and imaging sensors, which helps preserve image sharpness across frames. The adapter thread options expand compatibility with a variety of cameras and reducers, so you can reconfigure your imaging train without buying many bespoke adapters. 🔭

Usage Recommendations

Install the drawer between your focal reducer and camera, ensuring the M42-M48 adapter matches the camera thread. Tighten the locking screw to remove any lateral play after fitting a filter, and check that the overall back focus meets the focal reducer and camera sensor requirements. Consider that the 21 mm thickness will add to optical path length, so test focus and field illumination before a long imaging session. If you use additional accessories such as flattener or extenders, verify combined spacing to avoid vignetting and to preserve image scale.