With the eLAB system you can transform your digital camera into an easy to use shade matching system by following this photographic protocol
1. Watch out for dehydration! After exposure to air for more than 2 Min, dehydration sets in and shade images need to be taken some other day.
2. Turn off E-TTL when using polar_eyes! Use the manual mode to set the intensity to 1/1 or 1/2. The image quality should be set to RAW (not JPEG).
3. Always use retractors and make sure they are held firmly by the end of their handles, pulled up and back towards the ears. Matte black retractors are ideal.
4. The optical axis of the camera should be aligned perpendicular to the vertical plane of the white_balance card.
5. Use the Magic Hand Trick to check your working distance which should be between 22 - 28 cm in most cases.
6. Make sure the white_balance card is positioned in the middle of the frame and that it covers the entire image width.
7. Take one cross-polarized image with polar_eyes and with the white_balance card placed slightly below the incisal edges.
8. For reflected images without polar_eyes, the flash intensity needs to be lowered to ~1/4 in the manual mode or you can simply switch to E-TTL.
9. Use the Magic Hand Trick again to check your working distance for the reflected image.