Scientists designed a compact long-slit spectrometer for hyperspectral remote sensing. They compared two types of spectrometers and found that the Wynne-Offner design is better for long slits. The new spectrometer works in the 0.5–1.0 µm wavelength range with high resolution and a 61.44 mm slit length. The prototype showed high imaging quality with minimal distortions, making it suitable for remote sensing missions needing wide coverage in a small size.