SVBONY SV226 M42 Magnetic Filter Drawer (1.25″ and 2″)

Product Overview

The SVBONY SV226 is a 21 mm filter drawer for imaging trains, CNC-machined from aluminium as one integrated, light-tight piece. Its telescope side is M48 x 0.75 female and its camera side M42 x 0.75 male, and the sliders take 2″ filters directly or 1.25″ filters through the supplied adapter. Two pairs of magnets hold the slider in place, and a side lock screw removes any play. SVBONY lists the net weight as 400 g.

Who It's For

This is a good match if you image with a dedicated astronomy camera and want to change filters at the telescope without removing the camera, keeping focus and framing where you set them, in broadband or narrowband.

Key Features & Design

• Integrated anti-light-leak design: a sealed path for long exposures.
• Double pair of magnets: a firmer hold than screw retention, with easier installation and removal.
• 1.25″ and 2″ in one drawer: 2″ sliders plus a 2″-to-1.25″ adapter.
• 21 mm thickness: a fixed figure for your backfocus total; the side lock screw adjusts tension.
• M42-M48 adapter included: resolves thread differences between camera and filter mount.

Mechanical Design

Machining the frame as one piece keeps the faces parallel and the light path sealed. The filter mounts are threaded M48 x 0.75 and M28.5 x 0.6, so standard 2″ and 1.25″ filters thread in directly, and at 21 mm the drawer fits into most 55 mm corrector budgets alongside a camera and spacers.

Recommended Uses

• Narrowband imaging with H-alpha, OIII and SII filters in separate sliders.
• Broadband and LRGB imaging with quick changes between filters.
• Light-pollution and dual-band filters swapped in and out as conditions change.

Compatibility and Accessory Notes

• Position in the train: between the telescope or focal reducer and the camera.
• Listed by SVBONY for: the SV550 and SV503 OTAs and the F9198F and F9198K cameras.
• Extra sliders and adapters: SVBONY sells spare 2″ sliders and 2″-to-1.25″ adapters for this M42 drawer.
• OAG builds: for the SV238 off-axis guider, SVBONY's SV226P is the drawer with the matching mounting holes.

Send us your telescope, reducer and camera and we will work out the spacing around the 21 mm drawer with you.

What's in the Box

• Drawer frame x1
• 2″ filter slider x2
• 2″-1.25″ filter adapter x1
• M42F-M48M adapter x1
• Plastic case x1

Good to Know Before You Order

• Filters sold separately.
• 21 mm of backfocus: the drawer counts toward your corrector's spacing figure.
• Imaging accessory: it has no application in a visual train.

Frequently Asked Questions

Is it difficult to set up?

No. Thread the drawer between your telescope or reducer and the camera, mount each filter in a slider and slide it in; the magnets locate it.

Can I use 1.25″ and 2″ filters?

Yes. The sliders take 2″ filters and the supplied adapter takes 1.25″.

Does it attach to the SV238 OAG?

The SV226P is the version SVBONY makes for the SV238; this drawer threads inline instead.

Bottom Line

In short: a 21 mm, 400 g magnetic filter drawer with M48 and M42 threads, two 2″ sliders, a 1.25″ adapter and an M42-M48 adapter, for fast filter changes behind the telescope.