كرة إرسال F/7.1 - 4 بوصة - موجة 1/10، PV.

I was a little skeptical about spending this much on a transmission sphere, but the 4-inch aperture and F/7.1 spec made it perfect for my interferometer setup. The wavefront error is remarkably low—it's definitely delivering clean, repeatable measurements.

The 1/10 wave PV accuracy gives me confidence in my interferometry results, and the 4-inch aperture is a solid fit for my bench setup. Only gripe is the protective case doesn’t latch as snugly as I’d like, but the glass itself is flawless.

The F/7.1 is a solid workhorse for the lab—the 1/10 wave PV tolerance held up nicely across our interferometry tests. Only minor gripe is the 4" aperture feels a bit unwieldy when swapping between setups, but the results are clean and repeatable.