Optolong クリアスカイフィルター - 77mm 丸型マウント - CS-77

The 77mm size fit perfectly on my telescope, and the difference in contrast on nebulae was immediately obvious. Faint DSOs I struggled with before now show clear detail even from my suburban backyard.

I was skeptical about light pollution filters, but this one cut through the orange glow so clearly that I could finally see the Orion Nebula's faint details from my backyard. The 77mm threads fit my setup perfectly without any adapter fuss.

The first night out with this filter, the background sky looked noticeably darker, letting the faint nebula details pop through without the usual orange haze. I was impressed how little exposure time I needed to adjust for the light cut, and it threaded onto my 77mm lens perfectly out of the box.