For my current research project I need to take photos in a wind tunnel (A big enclosed rectangular 400cm x 100cm x 70cm). The objects are super tiny seeds that disperse on a white reflective sticky carpet inside the tunnel.
In this tunnel I installed 2 led light strips on upper both sides along its length. The lights are facing the ceiling because it will be super reflective if it’s facing down, towards the sticky carpet. However, with the lights facing towards the ceiling there are still reflections on the carpet.
Because the ceiling is white (actually all part of the wind tunnel is white) I took the initiative to paint black the ceiling, which help reduce the reflection, but now the light is less diffused and darker.
On the camera setting, I used the lowest ISO and aperture, and play only with the shutter (The camera I use is Canon 700D with 16mm lens. With this lens I took 6 photos along the 4m length of the carpet, I can not take more than 6 photos because I will have so many repetitions and will produce a lot of photos if it’s more than 6)
Until now I still get photos with very minimum quality to be analyzed on image processing software. Here I attached the wind tunnel photo (so you can have the idea) and the photo result I have.
Any suggestion to get better quality images (aka we can see more clearly the seeds) will be a huge huge help. Thank you!!