ZWO EFW 5×2" Filter Wheel
When will I receive it?
Products marked In stock are dispatched promptly — the exact delivery estimate for your address is shown at checkout, before you confirm the order.
For international shipments, delivery times depend on the destination and are always displayed at checkout before payment.
Products marked Available on order require 5–15 business days for processing. Our team will keep you updated promptly if anything changes.
What are the warranty terms?
Shop with confidence: all our products include a 24-month legal warranty for conformity defects, managed directly by our team.
Many brands also offer extended warranty coverage beyond 24 months — contact us to find out the specific terms for the product you're interested in.
Click here for more information.
Can I return a product?
Yes: you have 14 days from delivery to return any product and receive a full refund — see our Refund Policy for full details.
Items must be returned in their original condition and packaging. Return shipping costs are the customer's responsibility.
Not sure which product is right for you? Contact us before buying — we'll help you find the perfect instrument so you won't need to return anything.
Sei un'azienda? Compila il modulo per la fatturazione
Clicca sul pulsante qui sotto per inserire i tuoi dati aziendali:
Vai al moduloThe ZWO EFW 5×2" (Electronic Filter Wheel) is a 5-position motorised filter wheel designed for astrophotography with 2" filters — the most widely used format among amateur and semi-professional astrophotographers. With 5 slots for 2" filters (M48×0.75) or unmounted 50 mm filters, it enables automatic switching through a complete LRGB or narrowband sequence (Ha, SII, OIII) without touching the optics and without losing focus. Powered and controlled directly via the built-in USB-C hub of the ASI camera.
2" filters: the universal format for astrophotography
The EFW 5×2" is the natural choice for standard 2" filters with M48×0.75 thread — narrowband Ha, SII, OIII or LRGB — thanks to the widest market availability. The precision stepper motor reaches each position repeatably and silently. Filters sit only 10 mm from the sensor, eliminating vignetting even with fast telescopes.
T2 connection and native ASIAIR integration
Both connections are T2 (M42×0.75). The EFW 5×2" integrates natively with ASIAIR Mini, ASIAIR Plus and ASIAIR Pro for fully automated filter sequences. Optical length: 20 mm. T2 adapter included.
CNC aluminium body, ideal weight-to-rigidity ratio
CNC-machined aluminium body for structural rigidity and thermal stability. Weight 540 g, power draw 120 mA via USB-C — compatible with any hub or power bank.
Technical specifications
| Filter positions | 5 |
|---|---|
| Filter format | 2" (M48×0.75) / 50 mm unmounted |
| Telescope-side connection | T2 (M42×0.75) |
| Camera-side connection | T2 (M42×0.75) |
| Optical length | 20 mm |
| Filter-to-sensor distance | 10 mm |
| Power supply | USB-C (ASI camera hub) |
| Power consumption | 120 mA |
| Motor type | Stepper motor |
| Material | Aluminium |
| Weight | 540 g |
| Manufacturer | ZWO (Suzhou ZWO Co., Ltd.) |