Camera lens for the 6-m Russian telescope fiber-optic magnetometer

Abstract

We have designed and produced a speed camera lens for fiber-optic magnetometer of the prime focus of the 6-m Russian telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. Resolution of the developed lens obtained during test observations corresponds to the calculated value. The transmission of the lens was measured at three wavelength ranges. It is equal to 78% at a wavelength of 6328 Å, 80% at λ 5320 Å, and 19% at λ 4050 Å. A transmission cutoff for wavelengths shorter than 430 nm is outside the operational range of the spectrograph of the fiber-optic magnetometer which is 430–690 nm.