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Hi everyone, I am looking to purchase this filter wheel from ZWO and these filters from Astronomik. The details for the filter wheel says it accepts the use of 8 x1.25″ mounted or 31mm unmounted filters. I emphasised the unmounted part of that as that is where my confusion is, as the filters details say 31mm round mounted. I have tried searching all over the place but cannot find any solid information as to whether or not those filters will fit in that filter wheel. All other filter sets of the same 31mm size that I have seen say unmounted. Does anybody know if those filters will fit in that filter wheel? Thanks! |
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Hi AstroPhil, 31mm mounted will not work with you. if you want mounted filters, you're left only with 1.25. if you really need the 31mm version, you'll have to look for unmounted. |
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I think the ones from the link you posted should work. Usually 31 mm filters are named as '1.25" filters' when they are mounted in a threaded cell and as '31mm filters' when they have only a protective plastic edge or, in some cases, when they are only glass. In the description of one of the astronomik filters is written: - The H-alpha 6 nm CCD Filter, size 31 mm (1.25-inch) Mounted in Low Profile Non-Threaded Cell by Astronomik -. Maybe is that 'Mounted' in the sentence that caused the confusion, because to me they looks exactly the same things other manufacturies put on their 31mm unmounted filters. Also from the picture I would say they looks exactly like the 31mm unmounted Astrodon for example. Anyway to dispel any doubt the best would be contact Astronomik and ask for measurements. |
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Phil, No expert here, but if they are 31mm mounted and don't fit, simply remove the filters from the mount. I have a ZWO filter wheel that takes 1.25" mounted or 31mm unmounted filters. To use the unmounted filters, there are screws that hold the unmounted filters in place. Ron |
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Hey everyone, thanks for the replies really appreciate it. There is still confusing/conflicting information so as VuurEnVlam said I'll be contacting Astronomik to be 100% sure before I pull the trigger on them. I'll update once I have the answer  Thanks, Phil |
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| I know this is old but what was the answer? I am having this issue now. |
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| My experience with the EFW for ASI1600mm confirms that you could use both 31mm (true unmounted or 31mm mounted) and 1.25 mounted filters at the same time. No problem at all. |
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Min Xie: My problem is the included M2 screws are not long enough to do this. I'm having this issue right at the moment. The problem is not combining them it is fitting 31mm mounted filters in the EFW Mini (with filter masks + zwo M2 screws). |
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Brian, No worries. You could purchase different lengths of the M2 screws from Amazon at a very low price. I replaced all my ZWO factory screws with longer version. -Min |
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| What screws did you use then? 6mm length? |
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| I bought a box (around 10 bucks?) with different sizes from 4mm to 10mm. |
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Here is a virtual buffet of M2 screws for $13, including 4, 6, 8, 10, 12mm and more. https://www.amazon.com/DYWISHKEY-Pieces-Socket-Screws-Wrench/dp/B07W5J19Y5/ref=sr_1_5?crid=CY47P72DW5I6&dchild=1&keywords=m2+screw+kit&qid=1620394956&sprefix=m2+screw%2Caps%2C172&sr=8-5 |
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