Quote:
Originally Posted by Peter.M
In the end there is only going to be 2 different ways to know for sure. The first one is to go down there and read what is on the side of the filter. The second if the guy who sold it to you had a full set, which seems likely. Why not contact him and see which one he still has. If he only bought 2 then it would most likely be HA, because I cant think of a reason to get SII and OIII.
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Believe me I have contacted him and he doesn't know, he bought both ha and SII and both were supposed to be in the fw but only 1 was. Also the filters are unmounted, just glass edges like this
https://www.optcorp.com/ba-fsiin-rd5...unmounted.html
So I will need to deduce it. I also took an image of m83 last night thinking that ha regions would show up clearly and almost no detail was showing which makes me agree that it is an SII filter, I will post that pic tonight along with an image of the running chicken neb