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ZWO 8 position 1.25"/31mm Electronic Filter Wheel - ZWO-EFW-8x1.25

In Stock - Ships Today if Ordered by 3pm! (Tues - Fri)

FedEx Ground Order Cutoff is 11am

Filter Wheel

We will price-match Canadian astronomy dealer pricing

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ZWO's latest EFW (Electronic Filter Wheel), larger than the previous version but still low on weight. Only 400 grams (14 oz)!

The body is CNC milled from an aircraft graded aluminum block.
We decided to make it thinner - it measures only 20 mm thick on the wheel body.

The heart of our EFW comes from NPM, Japan, who is the manufacturer for the high quality stepper motor. Guaranteed long life.

This filter wheel has 8 positions, 1.25″ or 31mm filters  (with the included filter masks)

The Electronic Filter wheel can be rotated in both counter clockwise or clockwise direction for filter selection.

There is no need for multiple cables to power this wheel up, just one USB cable does the trick. The power consumption of this EFW is approximately 120mAh @ 5V, which can be operated from the cooled CCD USB hub.

The distance between the filter and sensor is around 10mm when you connect it to an ASI1600.

1.25″ filters won’t have vignetting up to an F5 focal ratio scope and 31mm filters won’t have vignetting up to F2

Our new LRGB filters are recommended to work with the ASI1600; they will offer nearly 1:1:1 RGB color balance.

What`s in the box?

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

Items that have been opened, damaged or are otherwise unsaleable will be subject to a minimum 10% restocking fee, to be assessed by Telescopes Canada upon receipt of the returned goods

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Typographical Errors and Order Cancellations

Telescopes Canada reserves the right to cancel an order due to an error in pricing by Telescopes Canada or one of our suppliers, equipment being no longer obtainable, or other events which are out of our control.

Client-Initiated Cancellations

Client-initiated order cancellations are accepted prior to delivery of the equipment to the customer, thereafter it is a return.

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