Does this fit the 150-500mm lens?
I purchased the lens cap for a Sigma 50-500 mm lens, so I can not say with absolute certainty that it would fit a 150-500 mm. Looking at the specs for the 150-500 shows the same filter size required, so I would think it would fit.
Having the center release tabs is very convenient, especially with the lens hood in place.
I do not have the 150-500 I have the 50-500 but the lens barrel is the same size. I really like this cap because with the inboard release tabs rather than the ones on the edge of the cap you can put on and take it off with the lens hood on, so it's great lens cap and yes 86mm is the size you need.
the 150 to 500 millimeter lens is 95 millimeter.I bought the 86 millimeter cap to fit on a polarizer filter that i use on the lens.I have to use a reduction ring to do this.