Giant 70mm objectives gather a serious amount of light (twice as much as 50mm objectives)- so these are ideal for astronomy. Available in your choice of either 11x or 15x magnification.
List of products by brand Oberwerk
Oberwerk XL 100 SD
Oberwerk 25×100 Deluxe IF (individual focus). Fully broadband multi-coated, waterproof and nitrogen-filled.