ZWO EFW 8 x 1.25″/31mm

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$299.00

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Product Description

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

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

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The heart of our EFW comes from NPM, Japan, whose the manufactor for the stepmotor and the quality is trustful and reliable. Guaranteed long life.

06The Electronic Filter wheel can be rotated in both counter clockwise or clockwise direction for filter selection.

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There are 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’s USB hub.

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

So 1.25″ filters won’t have vignetting up to F5 focal ratio scope and 31mm filter won’t have vignetting up to F2 lens.

Our new RGBL filters are recommended to work with ASI1600, it will offer nearly 1:1:1 RGB color balance.

What’s in the box?

  1. 8*31mm EFW body
  2. 1.25″ cover
  3. T2 nosepiece
  4. 1.25″ holder(with cover and 2 screws)
  5. T2-T2 adapter(male)
  6. A bag of filter masks
  7. USB2.0 2m cable
  8. Phillips screwdriver
  9. A bag of M2 screws

配件-英文

How to install the filter?

1.25″ filters required to be: threaded  shorter than 3mm in length,  without threads less than 7mm in height

  1. Take the back cover off
  2. Lay the wheel down flat
  3. Screw-in the filters up
  4. Put the back cover on

Take the EFWmini for an example:

Wheel-Filter

31mm and 36mm filter requires: a set of M2 screws and washers needed to fix the filters are included in the package .

  1. Take the back cover off. Lay the wheel down flat
  2. Hold the filter by the very edges and lay them in to the recess for each position
  3. Attach the washers,put in the screws
  4. Put the back cover on

Take the EFWmini for an example:

Wheel-31mmFilter

How to connect with the camera and telescope?

Connect-camera-with-EFW

How to use it?

you just need to plugin the EFW with USB2.0 cable and install the   ASCOM driver

There are  ZWO Filter Wheel(1) and ZWO Filter Wheel(2) to select,  you can use either one of them

There are 2 ASCOM is for controling 2 EFW in one software.

Mechanical Diagram

 企业微信截图_16184655475039

Q & A

1. My EFW tries to move but gets stuck and cannot arrive at the right position.

1) Filter is too thick: Filters (not including the threads) must be less than 7mm in thickness and threadsmust be less than 3mm in thickness.

2) The M2 screw used to secure the filter is too long and causes the wheel to jam.

3) The M42 thread of the scope or the camera is too long and protrudes into the filter wheel, hitting the filter or wheel, causing it to jam.

2. My EFW spins but never stops, or stops at the wrong position.

ZWO EFW uses an infrared sensor to check wheel position.  If the sensor malfunctions, you can usually resolve by recalibrating the EFW in the ASCOM driver. Simply click “ReCalibrate” in ASCOM driver interface. It can take up to 60 seconds to perform this action.

ASCOM Driver

3. I use 7-position EFW, normally I had slots 1, 2, 3, 4 filled and slots 5, 6, 7 empty, but then I got the error below and the EFW stopped working. I checked the carousel. It was not too tight or loose.

EFW-error

When using the filter wheel it is very important to keep its internal balance. The weight and distribution of the filters will affect balance. Thus we recommend you space the filters out and evenly distribute them. In this case, install them in slots 1, 3, 5 and 7, then the EFW will work again.

Shipping & Delivery

Fast Shipping: we will choose DHL, UPS, FedEx etc to deliver it. Usually you will get your package within 15-20 days.

  • Fast Shipping(amount ≧ 199USD) for free
  • Fast Shipping(amount < 199USD) : $30.00 (We do not provide free shipping from now on.)

Introduction

  1. It will take around 60-90 days for shipment via ePacket/China Post Registered Air Mail/EMS, which can’t be guaranteed due to force majeure. If you can’t get the air mail package after 2months, please let us know ASAP: info@zwoptical.com
  2. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  3. Customers from Russia need to provide the complete English name with three words as well as the English shipping address.

Tracking site

DGM: http://webtrack.dhlglobalmail.com/?locale=en-US

China air mail: http://www.17track.net/en

 

Tax

  • 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 from local dealers.

 

Warranty & Return

1. ZWO hereby declares that it will provide customers with a warranty period of 2 years for ZWO branded products (excluding APO), as per this policy. APO products will be covered by a 1-year free warranty service, starting from the day following the receipt of the product by the customer. For ASIAIR Plus users, the warranty period will commence from the day of device activation.

2. If a User encounters the following Dead on Arrival (DOA) and contacts ZWO within the corresponding time limit to issue the Product purchase invoice and relevant evidence, ZWO will provide door-to-door pick-up service and, as appropriate, after-sale replacement (or partial replacement), repair or return (or partial return) service for the following Products:
1) Product quality problem
Provided that a User detects a quality problem and contacts ZWO within 30 days after receipt of the Products, and ZWO support team confirms that the Products indeed have a quality problem or defect after their inspection, ZWO will provide free replacement service towards such Products;
2) Product transportation problem
Provided that a User finds obvious signs of bubbling, serious overstocking, or deformation on the outer package of the Products upon receipt of the Products, and provides ZWO with pictures of the outer package and proof of receipt within 3 days after receipt of such Products, ZWO support team will verify the actual shipper and determine the responsible party for such transportation problem. In the event that ZWO is the actual shipper, ZWO will be responsible for providing the relevant return or replacement service, however, if the Products are directly sold or transported to the User by an agent of ZWO, the agent will be responsible for providing the relevant return or replacement service.

3. If the Products are under the following circumstances, they are not within the scope of warranty service, ZWO may provide maintenance services to the Users:
1) The Warranty Period of the Products has expired; or
2) The Products are injected into liquid or affected by moisture or corrosion; or
3) The Products are damaged by an external force (such as the broken of the camera protection window glass, the deformation of the product shell, the broken of the USB port, etc.); or
4) Disassembling, repairing by a third party, refurbishment of the Products (such as downloading erroneous firmware) without the written authorization of ZWO; or
5) The product system is modified, or the maintenance notice is lost or changed; or
6) Product quality problem caused by installation not following the requirements or instructions for the Products; or
7) Physical damage or failure of the Products caused by the force majeure (such as strong vibration or extrusion such as flood, fire, earthquake, or thunder stroke); or
8)Damage caused by the improper User operation during the period of shooting or use, such as using without the equipment protection or direct shooting of the sun; or
9) No valid purchase invoice or warranty certificate; or
10) The Products are second-hand products.
Any quality problem with the accessories or other parts of the Products is not a condition for the return or change of the Products, and the User may solely request to replace the accessories with new ones, which shall be handled after verification by ZWO support team.
If the issue with your ZWO product was caused by certain damage (such as severe damage not covered by the 2-year warranty), you might have to pay the replacement value.

4. For the normal repair or replacement of the Products during the Warranty Period, the User will bear the return cost. When returning the Products, Users shall specify the actual reasons for the damage to the Products, and shall provide the corresponding valid certificates, such as pictures or videos, etc.
For the Products that need to be replaced after being confirmed by ZWO in writing, the User shall return the Products with the complete package, together with all accessories, manuals, etc., to the address designated by ZWO.
By sending back the product to ZWO, the User agrees to pay out-of-warranty fees that may arise during the repair process of the product. ZWO will send back the product after charging.

5. If a User encounters any problem during the use of ZWO Products, you may at any time contact ZWO for technical support via ZWO Support.

For the Products that need to be returned for after-sales service, ZWO will provide the corresponding RMA code for reference.
ZWO will not accept any products having no RMA code that have been returned privately without ZWO written confirmation.

6. If a User purchases the ZWO Products from a ZWO agent, the User may contact the ZWO agent directly for the relevant after-sales service.

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

  1. Avatar

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    In order to achieve the 55mm back focus required by the ASI294MM pro. This filter wheel will be replacing the 21mm spacer that comes with the camera?

    Thank you




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    Hi,
    I bought the EFW and installed the 31mm filters. Unfortunately, I have to less M2 screws, could you please send me the spec of the screws so that I can order additional ones from my local dealer?
    Best regards,
    Heiko




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      Where did you buy this EFW? If you buy it from a dealer you can contact the dealer for help, if you buy it from us please send an email to info@zwoptical.com




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  3. Avatar

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    Hi. I have some Doubts about the weel electrical connection.
    Really I dont understand where I Have to connect the USD plug… If I to Connect to Camera (as you say), How do I move the weel ??… Or if I connect to PC (without using ASCOM PLEASE) How Do I move??
    Thanks By Help!




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      The wheel is controlled by software on the computer, not move the wheel by hand.




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    Maybe already somewhere answered – so sorry for repeat question: 31mm filter mounted …..can it be used in the EFW or must I have 31mm unmounted or 1,25″ screw mount?




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      The 31mm unmounted filters can be used in the EFW. You could refer to the description “How to install the filter?” on the website.




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    For the ASI 183 would the 7X36 MM be appropriate size?

    Thanks,




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      7*36MM can be used with ASI183, but for this camera, 1.25″ filter is enough.




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    I purchased a used EFW (for 1.25” filters) and ASI1600mm several months ago, as well as some Baader filters. I installed the filters and tested the EFW connected to the camera using both ASICAP and AstroImager and the filter wheel appeared to work just fine. This weekend I finally had time to connect this combo to a camera lens for daytime testing. Everything worked well for while but then the EFW began to act up, Filters would only change part way, not lining up with the EFW holes. Or they wouldn’t move at all when I tried to switch filters. When they did moved it seemed noisy and the movement was intermittent. I was using an Orion Dynamo Pro for power and thought maybe it was losing its charge, so switched to a fully charged 12v battery, but it made no difference. Has my EFW gone bad? How noisy should it be when changing filters?




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      Please make sure the height of your filter is lower than 7.5mm, and the depth of the thread is lower than 2.5mm.
      And you can clean the light sensor inside the EFW.




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    Hi. What is the maximum thickness of filter that can be installed in the 7x 36 mm version? Are 5 mm thick filters OK?




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      5mm thick filters can be fixed with longer screws.




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  8. Avatar

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    What is the current draw of the filterwheel?




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      There are 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’s USB hub.




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  9. Avatar

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    Can the EFW-8 attach to the ASI294MC PRO? (Yes, I understand some of the issues combining additional optical filters with the Bayer matrix; I am questioning the mechanical attachment and operation.) Thanks for your time.




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    How repeatable are the filter positions? Should flat-field exposures be taken before switching filters, or can the acquisition of flats wait to the end of the night?




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      Usually the position will not change.
      You can take the flat field at any time.
      We recommend you to clean the dust on the filters.




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  11. Avatar

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    I am using ASI071MC Pro camera, does 7 x 36mm filter wheel work for this camera?




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      Yes, it does.




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  12. Avatar

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    So I have to buy entire new filter wheel if I want to change from 31mm filters to 36mm?




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      We recommend you to buy a new EFW.
      Because different version will have compatibility issue.
      After doing the changing operation, it may have unexpected problems.




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  13. Avatar

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    If I changed the carousel from 8 x 1.25inch/31mm to 7 x 36mm, will the filter wheel automatically identify the new carousal and act accordingly or will it need some internal micro-controller reprogramming?

    How can I order the carousel separately?

    Thank you




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      Sorry to tell you that we do not support this service.:(




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    Hello, I have a SW Quattro 250 f4 Telescope. Should I use 36mm filters in EFW for my ASI1600MM to avoid vignetting or 31mm filters?




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      31mm is big enough to avoid vignetting. 36mm will be better.




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  15. Avatar

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    Hi,

    I am posting here so others can benefit.
    I got really confused because documentation lists #6 – spacers and then instructs to screw filters with washers. I noticed that the spacers had three holes matching the ones on the wheel around filters. But when I tried them they were overlapping a bit, so I thought it was wrong.

    To summarize, washers are no longer included since beginning of 2018. They are replaced by masks (#6 – spacers on the parts list). Those masks are meant to eliminate reflection issues with unmounted narrow band filters. Overlapping is normal in current design.

    If you want to update your documentation you can use the picture I sent to support by email. I hereby give you all rights to use it.

    Thanks for your help and great products!




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      Thank you, some images, we need to update.




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    I have there are none




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      pardon me.




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  17. Avatar

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    Hi,

    I have received the filter wheel. Mounted the filters but they move as I didn’t wan’t to tighten screws on glass too much.
    There were no washers, is it normal?

    Thanks




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      No washers? please check the bottom of the box.




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  18. Avatar

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    Hi,

    Which extender exactly is it I would need for the 2″ telescope interface?

    Thanks




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  19. Avatar

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    Hi,
    I just ordered the 8-whole EWF and the ASI1600MM Pro mono. In your description it says the distance between the filter and the sensor for the ASI1600MM Pro mono is about 10mm and the EWF body is 20mm. I need 55mm backfocus for a reducer/flattener. I want to get a Baader VariLock 29 or 46. Question:

    Do I need to space the difference between 55mm and 10mm or between 55m and 20mm?

    Thank you!

    Roman




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  20. Avatar

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    No, Sam. I’m not talking about the wheel. I know the camera goes on the motor side. I’m talking about the actual filters. It’s difficult to know the coated side from the other and so they might be placed in the wheel in reverse. Is there a way to tell … better than the picture on your website?




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      Hi Clayton
      Sorry. The way on our website is the best way we can tell. color and reflection.




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