ZWO EFW (5 x 2″/7 x 2″)



Product Description

ZWO EFW (5 x 2″or 7 x 2″)

Product weight:EFW 5 x 2″=500g / EFW 7 x 2″=650g

Power supply:USB2.0

Control Mode: ASCOM and SDK

Driver:Free of driver


The filter wheel body is CNC milled from an aircraft graded aluminum block.

Excellent craftsmanship, very thin and light with only 20mm thickness.

The core part of our EFW is the stepper motor which has reliable performance and quality that comes from NPM, Japan.

We have two specifications for EFW2”:

  2″ Thread-In Filters or

50.4mm ±0.5mm Unmounted Filters can be used 

The 2” Electronic Filter Wheel can be rotated in both counter clockwise and clockwise direction for filter selection.

EFW2-2 EFW2-3

There is no need of multiple cables to power this wheel up, just one USB cable does the trick.The maximum power supply of this EFW is approximately 120mAh @ 5V, which can be operated from the Cooled CCD’s USB2.0 port.

When connected to ASI6200, the distance from the filter to the sensor is about 18mm

Our 2″ RGBL filters are recommended to work with ASI6200MM Pro camera, it will offer nearly 1:1:1 RGB color balance.

Below requirements must be met while using the 2” filter from third-party.



What’s in the box?

1. EFW2*5 or FW2*7 body
2. USB2.0 – 2m cable
3. A bag of M2.5*6 screws (6pcs/ bag)
4. A bag of filter masks for 50mm filters (7pcs/ bag)
5. Phillips screwdriver
6. A bag of M2*4 flat screws (23pcs/ bag)
7. M54M-M48F adapter
8. M54M-M42F adapter

5寸EFW配件(1) 7寸EFW配件(1)

Mechanical drawing

EFW2X5-Mechanical drawing(1) EFW2X7-Mechanical drawing(1)

Usage guider:

Connection methods of ASI6200MM Pro, 2” EFW and M68 OAG to get the best back-focus-length-solutions-55mm:

Before first usage of this product read manuals and install correct drivers and software.


  • Fast Shipping(amount ≧ 299USD) for free
  • Fast Shipping(amount < 299USD) : $20.00
  • Free Shipping(amount < 299USD) (Air Mail, 3-4 weeks) (Free)

If you can’t get the air mail package after 4 weeks, please let us know ASAP:


  1. Fast Shipping: we will choose DHL, UPS, TNT, EMS etc to deliver it. Usually you will get your package in one week. We provide free fast shipping for order ≧ $299 or charge extra $20 for order < $299.
  2. Free Shipping: we will ship via DGM or China Post Registered Air Mail. It usually costs 2-3 weeks to reach US or Europe and costs 3-4 weeks to reach far places.
  3. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  4. Customers from Russia need to provide the name of your company.

Tracking site:


China air mail:


  • The price list on our website is USD without tax.
  • Please note that buyers are liable to pay tax involved, such as Import tax, VAT , customs handling fee, etc. The additional fees may be collected at time of delivery by courier.
  • For best local service we advise customers buy our cameras form local dealers.

Warranty and Return Policy

  • We provide 2-year warranty for our products, we will offer the repair service for free within warranty period. After the warranty period, we will continue to provide repair support and service on a charged basis. We do not provide any replacement unless ZWO confirmed the product is DOA (Dead On Arrival).
  • This warranty does not apply to damage that occurred as a result of abuse or misuse, or caused by a fall or any other transportation failures after purchase.
  • Customer must pay for shipping when shipping the camera back for repair or replacement. If we confirm you can get a replacement, goods must be returned with all accessories, instructions, etc and must be suitably packed.
  • If you get a faulty camera, please contact us as soon as possible though email: Please describe the problem in detail and we will do our best to help you solve the problem. Most instances perceived problems are simply bad driver install or software configuration.
  • We will provide you RMA number if your camera requires warranty repair. We refuse any return without RMA number!
  • For customers who bought the camera from our dealer, dealer is responsible for the customer service for you.


Do you have question, answer or comment? Post here!

  1. Avatar

    (verified owner):

    One side is fixed with screws you said, but the screws don’t work for the asi294mc pro, so i use the thread. Both sides have threads…. the telescope side also has threads where i connect the spacers and comacorrector. So how do i fix that side with screws if you don’t own an OAG? Since the adapter rings turn freely in the thread on the telescope side?


    • Avatar


      Sorry about that.
      Yes there is thread on both side. You will need a adapter that converts M54 to M42.
      Also you can choose 36mm filter for ASI294MC Pro.


  2. Avatar

    (verified owner):

    On the camera side the camera stops when it hits the filterwheel, but how about the other side? My adapter rings (on a T2-T2 ring) and spacers can turn freely until inside the filterwheel. How do i stop it from fully inserting in the filterwheel?



    • Avatar


      In one side it provide M54*0.75 thread and in the other side it is fixed by screws.


  3. Avatar


    Is there a way to attach the ASI1600mm with its m 42 threads to this wheel with the provided adapters and maintain backfocus? I see there are m42 female adapters


    • Avatar


      Sorry no.
      ASI1600 does not need 2″ filters.


  4. Avatar


    I understand that at one end of the filter wheel we have M54 male and at the other end M54 female.
    Am I correct?



    • Avatar


      One side is M54*0.75 female and the other side is fixed with screws.



Add new

Recommended Accessories