61 Cygni, a famous long-period binary star, has orange components 28 seconds apart. NGC 869 and 884 make up the double cluster in Perseus. Rated as the finest open clusters for small telescopes. Contrasting colors are discernible in larger scopes. Eridani's components are yellow and blue-green, separated by about 7 seconds.
Colour contrast is vivid in medium to larger scopes.
Lambda Orionis is a 5.5- second pair of white stars. M37 is the finest of the great open clusters in Auriga. It is rich and has an orange star near its center. M35, a large, uniform, and bright star cluster, needs at least a 30-minute field. 12 Lyncis is a triple system, nice in a 6-inch. Castor.