Is this amount of internal dust enough to have an effect on photos? It's visible clearly through the aperture from both sides of the lens. : r/AskPhotography
What To Do With Dust Inside Lens
A Guide to Cleaning Lenses and Camera Sensors
How to Minimise and Clean Camera Sensor Dust | Iceland Photo Tours
VisibleDust Zee Pro Sensor-Cleaning Bulb Blower 19112366 B&H