21 STEP SENSITIVITY GUIDE
This all purpose precision exposure guide can be used on all stencil types to determine and standardize proper exposure accurately and quickly.
Directions:
Place the Saati 21-step guide on the screen. Optimize your exposure so that when washing out the image, you are left with 7 solid steps. If you see only 5 steps, you can run the risk of pinholes or premature breakdown, and you should double the exposure time. If you see 9 steps, you will have lost finer detail in the image, and you should halve the exposure time.
To Increase Step Guide by... | Multiply Original Exposure time By... |
1 step | 1.4 |
2 Steps | 2.0 |
3 Steps | 2.8 |
4 Steps | 4.0 |
To Decrease Step Guide By... | Multiply Original Exposure time By... |
1 Step | .70 |
2 Step | .50 |
3 Step | .35 |
4 Step | .25 |