[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?