Description

[Focal length] 320 mm (iHR320), 550 nm (iHR550)
[Aperture] f/4.1 (iHR320), f/6.4 (iHR550)
[Spectral Range] 150 – 1,500 nm (at 1,200 gr/mm grating)
[Spectral Dispersion] 2.35 nm/mm at 435 nm, 1,200 gr/mm (iHR320),
1.34 nm/mm at 435 nm, 1,200 gr/mm (iHR550)