There is a great little 18% reflectance / white balance 'pop-up' from Lastolite that will help you get more consistent exposures and colour control when shooting under different lighting conditions. The mid grey 18% helps you to set or correct the balance of neutral colours. Place in a shot and point it towards your principal light source, then take an exposure reading from it. Repeat for consistent exposure. The white side reflects about 90% of the light. Approximate diameter is 12" / 30cm.

Lastolite Ezybalance £18 + vat.

from Prokit

Lastolite