4" F/10.7 transmissiebol - 1/10 golf

I’ve been using this transmission sphere for final alignment checks on large optics, and the 1/10 wave accuracy makes the fringes rock steady. It paired well with my existing interferometer setup and the F/10.7 aperture gave me the working distance I needed. A bit pricey, but the performance is exac

Used this for testing a 12-inch flat, and the 1/10 wave accuracy made the fringe pattern crystal clear. The 4-inch aperture covers my smaller optics perfectly without any beam clipping.

Setup took me about an hour with the 1/10 wave PV spec, but the fringes were dead quiet once I aligned it—exactly what I needed for my interferometer’s null test. The 4-inch aperture covered my sample without vignetting, and the F/10.7 cone gave me plenty of working distance.