# Examples of diffraction limited optics calculations.

(c) Imageval Consulting, LLC, 2012

## Contents

```ieInit
```

## Create a point array scene

```scene = sceneCreate('point array');
scene = sceneSet(scene,'h fov',2);    % Degrees
``` ## Compute the irradiance

```oi = oiCreate;
oi = oiCompute(oi,scene);
oi = oiSet(oi,'name','Default f/#');
oiWindow;
``` ## Create diffraction limited optics with f/# of 12

```% Current f number
oiGet(oi,'optics f number')

% The larger f/# blurs the image more
% It has larger depth of field, however, because the aperture is smaller.
oi = oiSet(oi,'optics fnumber',12);
oi = oiSet(oi,'name','Large f/#');
oi = oiCompute(oi,scene);

oiWindow;
```
```ans =

4

``` ## Check the inter-related parameters

```p = oiGet(oi,'optics pupil diameter','mm')
f = oiGet(oi,'optics focal length','mm')
f/p
```
```p =

0.3219

f =

3.8628

ans =

12

```

## Show the diffraction-limited blur dependence on wavelength

```vcNewGraphWin;
uData = oiPlot(oi,'ls wavelength');
title(sprintf('F/# = %.0d',oiGet(oi,'optics f number')))
```  ## Look at the data structure returned by oiPlot

```uData
```
```uData =

x: [1x41 double]
wavelength: [31x1 double]
lsWave: [31x41 double]

```