Reasoning
Four sources were considered as separate opinions (two DigitalCameraWorld pages, Space.com, OscarLiang). For DigitalCameraWorld, the highest source confidence was used (0.95). A weighted average of the values 2, 6, 6, and 4 with confidences 0.95, 0.90, 0.90, and 0.90 yields approximately 4.47, which rounds to 4. This approach respects the instruction to treat each source as a single perspective and weigh by confidence.