Filters - worth replacing or not

[neilallison (Neil)]

So, I have acquired a 7 position ZWO filter wheel with 36mm LRGBSHO filters installed.
The trouble is, I am not 100% sure which filters are installed in which slot nor am I 100% that they're installed the correct way.
The filters look like they need a good clean, too.

Is there a way to determine which filter is which and which way they should be installed or do I just bite the bullet and buy new filters?

[Addos (Adam)]

No leftover packaging hey? Good deals always come at some cost


Have you tried comparing your filters with photos of ones on the internet? ZWO's a pretty popular brand....


Have you tried visually inspecting the filters? If you shine a torch through each one onto a white background, what colours do you see?


Have you tried taking some test photos with them? Could that help figure out which ones are the broadband, and which are the narrowband? Could said test photo's then be compared with an analogous spectrum image on the internets?


Bullets can be bitten, but taking that route everytime in this hobby will get expensive quickly.

[ChrisV (Chris)]

Just look through each filter at the sky during the day. RGB will be obvious and much brighter than the NB filters. Oiii will be greeny/blue and darker than G or B. Ha will be red, darker than R. Sii will be a bit like Ha but darker. You can't go wrong ...

As far as the correct direction. I don't know about zwo filters but my baaders have a little arrow on the side. Maybe follow this?
https://www.cloudynights.com/topic/6...r-orientation/