Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works perfectly

Obviously, this is made to fit perfectly with the Elinchrom 8 1/4 inch 50 degree monolight reflector. I use both and it's a match made in heaven. I did have to cut my gels to fit but that took all of but 1 or 2 minutes to do. No light escapes onto the background and it does its job well!