Some of the following twelve point cells are defined in Tom Krajci's web page "12 point mirror cell - design ideas that may be helpful". The rest are alternative layouts with different symmetries on the outer rings. By clicking on the images within an individual cell web page, you can download the Plop .gr file for that design.
There are four basic support point layouts: two with a three way symmetry and two with a four way symmetry. All have alternative parts layouts, which leads to the multiple designs presented here. More details on the first five cell designs can be found on Tom's page.
Although the cells all have similar perfomance values, some have better P-V performance while others have better RMS performance. The following table compares the cell performances for a 10in by 1in thick f/6 pyrex mirror:
| RMS | P-V | |
| 12a-b-c | 4.13E-07 | 3.06E-06 |
| 12d-e | 4.94E-07 | 2.97E-06 |
| 12f-g-h | 4.02E-07 | 3.07E-06 |
| 12i-j | 4.35E-07 | 2.43E-06 |
12 point mirror cell - design ideas that may be helpful
Archive of 12 point cell Plop designs [5KB]
Archive of 12 point cells with html and images [240KB]
Best of 18 and Over -- A Collection of Plop Cell Designs