ZWO EFW 8 x 1.25"/31mm Filter Wheel
ZWO
ZWO EFW 8 x 1.25-inch or 31mm automates filter changes for mono imaging with 1.25-inch filters.
Best Current Offer
Specifications
Mechanical
- Wheel type
- Electronic filter wheel
- Capacity
- 8 positions
- Weight
- 530 g
Filter
- Filter size
- 31 mm
Electronics
- Interface
- Electronic computer control
Use
- Primary use
- Automated LRGB and narrowband filter changes for mono imaging
Power
- Power
- 120 mA at 5 V
Astrophotography Fit
Best for mono rigs that need repeatable LRGB and narrowband filter sequencing.
ZWO EFW 8 x 1.25-inch or 31mm turns a monochrome camera into a practical imaging system by automating filter changes. The right wheel depends on sensor size, filter size, back-focus budget, and how many channels you want loaded at once.
Choose filter diameter conservatively. Undersized filters vignette; oversized filters cost more but protect future camera upgrades.
Best paired with
- Monochrome cooled cameras and matched LRGB/narrowband filter sets
- Autofocus routines with filter offsets
- Rigid threaded imaging trains with known back focus
Not recommended for
- One-shot color-only workflows
- Camera sensors larger than the filter size can illuminate cleanly
- Ultra-minimal travel rigs where weight and back focus are tight
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.
| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Agena AstroProducts Agena AstroProducts | $299.00 | In stock Updated 5/15/2026 | View Offer - $299.00 |
| Astronomics Astronomics | $299.00 | In stock Updated 5/14/2026 | View Offer - $299.00 |
| Cloud Break Optics Cloud Break Optics | $299.00 | In stock Updated 5/10/2026 | View Offer - $299.00 |
| High Point Scientific High Point Scientific | $299.00 | In stock Updated 5/15/2026 | View Offer - $299.00 |
| Mile High Astronomy Mile High Astronomy | $299.00 | In stock Updated 5/13/2026 | View Offer - $299.00 |
| Starizona Starizona | $299.00 | In stock Updated 5/15/2026 | View Offer - $299.00 |
| Telescopes.net Telescopes.net | $299.00 | In stock Updated 5/13/2026 | View Offer - $299.00 |
| ZWO USA ZWO USA | $299.00 | In stock Updated 5/15/2026 | View Offer - $299.00 |
Price History
Chronological retailer pricing with out-of-stock points shown at reduced opacity.