Computation with a true central obstruction of 75mm, allowing for refocus shift

Contents

Central obstruction: 75mm

By taking into account only the diameter of the secondary mirror (minor axis), the most optimistic values are generated. This does however not guarantee a fully illuminated field.

A better approach is to simulate with an effective central obstruction, computed as the real central obstruction minus the largest possible field stop (2"). If this yields a negative value, then compute with zero central obstruction.

The values in the following simulations have been computed while allowing for defocus compensation. This means that the computed designs will allow a different focus when pointed near horizon or near the zenit. Practically this means that you will need to refocus when aiming at different heights.

6 Points Cell: p6_1_5

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p6_1_5.gr (text file) Output of PLOP: Parameter r: 0.666667 Visible P-V Error: 3.39547e-05 mm Visible RMS Error: 7.5111e-06 mm Refocus change in focal length: -0.0869295 mm Cell parts: Part 1 Part 2 Part 3

6 Points Cell: p6_1_5_45

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p6_1_5.gr (text file) Output of PLOP: Parameter r: 0.666667 Visible P-V Error: 3.34746e-05 mm Visible RMS Error: 7.43428e-06 mm Refocus change in focal length: -0.0869291 mm Cell parts: Part 1 Part 2 Part 3

6 Points Cell (with PLOP's autocell): p6_autocell

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p6_autocell.gr (text file) Output of PLOP: Parameter rel-support-radii[0]: 0.5926 Visible P-V Error: 2.25765e-05 mm Visible RMS Error: 4.01092e-06 mm Refocus change in focal length: -0.0922544 mm Cell parts: Part 1

7 Points Cell: p7_1_6

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p7_1_6.gr (text file) Output of PLOP: Parameter r: 0.693695 Visual P-V Error: 1.72667e-05 mm Visual RMS Error: 3.98066e-06 mm Refocus change in focal length: -0.0562624 mm Cell parts: Part 1 Part 2 Part 3

Cell p8_1_7

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p8_1_7.gr (text file) Output of PLOP: r: 0.691869 mm err: 2.27135e-06 mm Visible P-V Error: 1.09646e-05 mm Visible RMS Error: 2.27135e-06 mm Refocus change in focal length: -0.0506169 mm Cell parts: Part 1 Part 2 Part 3

9 Points Cell: p9_1_8

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p9_1_8.gr (text file) Output of PLOP: Parameter r: 0.682219 Visual P-V Error: 1.02138e-05 mm Visual RMS Error: 1.62526e-06 mm Refocus change in focal length: -0.0531049 mm Cell parts: Part 1 Part 2 Part 3

9 Points Cell (with PLOP's autocell): p9_autocell

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p9_autocell.gr (text file) Output of PLOP: Parameter r_inner: 0.333333 Parameter r_outer: 0.777788 Visual P-V Error: 2.55425e-05 mm Visual RMS Error: 5.46643e-06 mm Refocus change in focal length: -0.0393259 mm Cell parts: Part 1

11 Points Cell: p11_1_10

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p11.gr (text file) Output of PLOP: Parameter rel-support-radii[1]: 0.661798 Parameter rel-support-radii[2]: 0.661803 Parameter support-angle[1]: 41.3794 Parameter support-angle[2]: 77.3789 Visible P-V Error: 6.92579e-06 mm Visible RMS Error: 1.35013e-06 mm Refocus change in focal length: -0.0625679 mm Cell parts: Part 1 Part 2 Part 3 Part 4 Part 5 Part 6 Part 7

12 Points Cell: p12b

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p12b.gr (text file) Output of PLOP: Parameter r0: 0.334088 Parameter r1: 0.743573 Parameter r2: 0.766565 Parameter a1: 42.2921 Visible P-V Error: 1.06872e-05 mm Visible RMS Error: 1.76924e-06 mm Refocus change in focal length: -0.0326522 mm Cell parts: Part 1 Part 2 Part 3

12 Points Cell: p12c

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p12c.gr (text file) Output of PLOP: Parameter r0: 0.334088 Parameter r1: 0.743573 Parameter r2: 0.766565 Parameter a1: 42.2921 Visible P-V Error: 1.06872e-05 mm Visible RMS Error: 1.76924e-06 mm Refocus change in focal length: -0.0326521 mm Cell parts: Part 1 Part 2 Part 3

12 Points Cell: p12d

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p12d.gr (text file) Output of PLOP: Parameter r0: 0.398838 Parameter r1: 0.763845 Parameter r2: 0.789815 Visible P-V Error: 1.03615e-05 mm Visible RMS Error: 2.10656e-06 mm Refocus change in focal length: -0.0313384 mm Cell parts: Part 1 Part 2

12 Points Cell: p12e

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p12e.gr (text file) Output of PLOP: Parameter r0: 0.398842 Parameter r1: 0.763828 Parameter r2: 0.789803 Visible P-V Error: 1.03621e-05 mm Visible RMS Error: 2.10656e-06 mm Refocus change in focal length: -0.0313465 mm Cell parts: Part 1 Part 2 Part 3 Part 4 Part 5 Part 6

12 Points Cell: p12f

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p12f.gr (text file) Output of PLOP: Parameter r0: 0.337615 Parameter r1: 0.757378 Parameter r2: 0.731176 Parameter a1: 22.1532 Visible P-V Error: 1.03911e-05 mm Visible RMS Error: 1.69952e-06 mm Refocus change in focal length: -0.0339263 mm Cell parts: Part 1 Part 2 Part 3

12 Points Cell: p12i

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p12i.gr (text file) Output of PLOP: Parameter r0: 0.409088 Parameter r1: 0.7627 Parameter a1: 23.6154 Visible P-V Error: 9.73386e-06 mm Visible RMS Error: 1.81218e-06 mm Refocus change in focal length: -0.0374393 mm Cell parts: Part 1 Part 2

18 Points Cell (with PLOP's autocell): p18_autocell

Color plot	Cell overview	Support points
Contour plot	PLOP data
	Input file for PLOP: p18_autocell.gr (text file) Output of PLOP: Parameter rel-support-radii[0]: 0.396199 Parameter rel-support-radii[1]: 0.797285 Visible P-V Error: 4.35824e-06 mm Visible RMS Error: 7.29162e-07 mm Refocus change in focal length: -0.0191484 mm Cell parts: Part 1 Part 2