二手 - 可調式 Bahtinov 對焦遮罩 8"-11"

The three-pronged adjustment on this used mask is surprisingly smooth, and it grips my 11-inch reflector perfectly without any wobble. I had a sharp diffraction pattern on my first test star within minutes.

I was worried about fit on my 10-inch SCT, but the adjustable rings gripped perfectly and the Bahtinov pattern is crisp for focusing. Worked first time out of the box with no issues.

The fit on my 10-inch SCT is perfect, and the Bahtinov pattern it produces for focusing is crisp and easy to read. I was relieved that the used condition was barely noticeable for the price.