If you don't have a lightbox, a long exposure (15-30 seconds, might need a very small f-stop or ND filter) and waving an LED torch around the PCB is almost as g

If you don't have a lightbox, a long exposure (15-30 seconds, might need a very small f-stop or ND filter) and waving an LED torch around the PCB is almost as good at removing all the shadows, but less consistent.