The illusion 7×50 binoculars are a great choice on a budget for astronomy and low light situations. The large 50mm lens and wide 7mm exit pupil allow a lot of light to reach the eye. Low cost, easy to handle and easy to service make them appealing.
As with many 7x binoculars you get a large depth of field making focusing easy. Also the lower power makes them less prone to hand shake.