Just few words about few binoculars I like and are "not so bad models" (technically and price/quality ratio speaking).
First: Photon (ex-USSR) 7 x 35 mm model with roof prisms (sold about 100 euros in the 80/90). Fine and clear image, low distortion and chromatic aberration.
Second: Helios (Japan made) 8 x 42 mm water resistant mode with phase coated roof prisms (sold just below 300 euros in EU, and 200 £ in GB). Again a fine and clear image, low distortion and chromatic aberration.
Third: Pearl 7 x 50 mm nautical model (of the 90’), with rubber shielded body (but not a true water-resistant model), a very fine and extremely bright (even in low light circumstances) image and also a rather wide field of view.
Four: (ex-USSR) 20 x 60 mm (sold about 100 euros in the 80/90). Well, a correct image, with medium distortion and chromatic aberration, and a "not so neutral" rendition (rather yellow/green), however for the price...
There is also the 20 x 80 mm triplet objective TS binocular with rubber shielded body (but not a true water-resistant model), sold about 150 euros (a very low price, isn’t it!), and weighting about 2 kg. This time the chromatic aberration is very present. As this is an astronomical deep sky instrument used for faint items observation, this is not very important (because your eyes in such a case are working with their rods in B&W, eliminating most of the chromatic aberration effect). In birding job, this model may be interesting for crepuscular and all other low light level observation (high power of x 20 and also a 4 mm ocular exit). As in the astronomical case, you will not be very disturbed due to the chromatic aberration and you will be able to see (from far away) night birds and other shy wildlife even in very dark areas. N.B.: for the absolute low light performances the good 7 x 50 mm models are among the best (and light) tools to "see at night and through the night" (electronic devices being put apart).