MLAstro 72mm F/3.4 compound lens

Our state-of-the-art compound lens has been meticulously engineered for use in spectroheliographs, ensuring optimal performance in solar observation. Featuring precisely crafted 6 elements, this lens achieves an ideal flat field, significantly reducing optical aberrations and minimizing field curvature on a field up to 16mm in diameter, more than enough to accommodate the 12mm long slit and support scope up to 1300mm in focal length.

This lens offer the ultimate sharpness in both center and edge of the 1" image sensor so you can use 1" image sensor with this lens and still experiencing pin sharp detail at the very edge of the frame. (IMX183, IMX533)

Comparing the center sharpness of the MLAstro 72mm f/3.4 with a high quality 25.4mm dia, 80mm fl doublet

Edge sharpness on MLAstro 72mm F/3.4 and a high quality 25.4mm dia, 80mm FL doublet on IMX178. The MLAstro compound lens offers significantly better sharpness and focus at the very edge of the frame.

The lens came with a 10-blade iris aperture so you can stop down the lens and physically reduce the exposure time. The lens is optimized for the Visual range (400-700nm) but has good sharpness and transmission toward near IR and retains decent sharpness toward CaK (393nm)

You'll need 2 of these lenses for each SHG optical build.