Solution To Focus Problem For Arecont Dome

Ran upon a new problem and wondered if this is common and how others have overcome the issue. I had a unique situation where I was installing (3) AV2456DN-S Arecont cameras and putting an 8mm lens on them. The picture was perfect UNTIL I put the cover on the camera. The curvature of the cover distorted the picture and clarity. Even the focus was off. If I took the cover off, the picture was perfect, cover on, picture aweful... I thought that maybe this was just a defective cover, but it happened on all the cameras with the 8mm lens. Camera works great with 2.8 to 4mm lens and the cover on. Anyone else ever have this issue? I'm assuming Arecont covers are not compatible with the full selection of their lens???

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