EFW - jams with astrodon filters !?!?!?

Sam@ZWO

sorry, we have to keep the EFW thickness is 20mm

so there is a requirement of the thickness with the filter

Support@ZWO

7 position EFW is 36mm unmounted filter wheel. I don't understand unmounted filter will stuck by something? the thickness of unmounted filter is really thin. Could you send us some pictures of your EFW?

Support@ZWO

OK, and you use 1.25" mounted filters of astrodon, right?

jamesskibum

I have the ZWO Electronic Filter Wheel 8.

The AstroDon 1.25 inch filters are too thick and hit the casing cover.

Is there any solution?

Can I add very thin washers between the wheel body and cover plate?

Support@ZWO

I think you can use the nagetive side of front piece, turn around it and lock up with screws. it will provide 1-2mm extra distance.

jamesskibum

Yes, this is a good solution

Thank you, Jim Richmond

Support@ZWO

You are welcome!

james1ca

I use Astrodon filters in my ZWO 8-position filter wheel (at least for Ha, OIII, and SII) and haven't noticed any problems. However, make certain that the male end of any t-thread adapter or extension tube that you are using does not extend into the filter wheel housing itself.

In any case, it would be useful if someone made thin washers that fit 1.25" filters so that filters that had deep male threads didn't extend past the rear of the filter wheel.

Support@ZWO

james1ca wrote:
I use Astrodon filters in my ZWO 8-position filter wheel (at least for Ha, OIII, and SII) and haven't noticed any problems. However, make certain that the male end of any t-thread adapter or extension tube that you are using does not extend into the filter wheel housing itself.

In any case, it would be useful if someone made thin washers that fit 1.25" filters so that filters that had deep male threads didn't extend past the rear of the filter wheel.

Thanks for share your experience!

m44dsw

So I thought I would post my experience as I have just received the 8 position filter wheel and a set of LRGB, Ha, OIII and SII Astrodon filters. The narrowband filters are not a problem, nor in my case was the Luminance filter, but the R,G,B filters were catching on the front case. As you say Turing over the front case fixes the issue.

Shown here is the outer case with the side that needs to go on outside in my situation.

C49D3736-6246-4222-867E-2E6ABECFA53C.jpeg

Here is my set of filters in the wheel

CA9E9B8A-8ABF-478B-8E3A-AA974E77D0CD.jpeg

Support@ZWO

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