Ronchi eyepiece (10 L/mm)
(Astronomik: Ronchi)
49.90 EUR
Ronchi eyepiece for photography (10 L/mm)
(Astronomik: RonchiPH)
54.90 EUR
telescope test: Interferometric measurement on axis with Twyman-Green interferometer, and comprehensive documentation of results along with original interferograms.
(-Lacerta: TelTest-3)
249.00 EUR