The Monarch series from the Japanese concern Nikon used to consist of three roof-prism models with 42 mm objective lens diameter and 8,10 and 12x magnification. These sets of binoculars, costing about 300 USD, were quite praised and recommended by ornithologists.
sharp image almost to the very edge of the field; well corrected astigmatism; slight coma although still noticeable at the edge of the field; solid casing; very comfortable to hold; high quality BaK-4 prisms; nice and not truncated exit pupils
significant chromatic aberration; especially visible at the edge of the field of view; for a night pair of binoculars the transmission could have been better (but it is not so easy in the case of a roof-prism instrument