Need help on collimator lens

So the first time I ordered from tcss I ordered one of eatch of the Collimator lenses so I could try itch one out, so the ine I settled with was compleley flat on top and gives a very tight beam, and has a tight diamond shaped beam when pointing it at things,can someone help me identify which lens I am using because I want to get more, I ordered some 5 deg lenses but I don't think they are the same, they are not smooth on the face of the lens they have divot grooved out

The smooth top is the ten degree

Ok cool, so how do I tell the diff between the 5 deg lens and the lux rebel 8.7 degree

I don't know as I have never used the rebel lenses.

sorry.

The Rebel 8.7 degree lens should have a taller tab on it.

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