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<TITLE>The ef wavefront reduction package. -- 2 Getting started.</TITLE>
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    <A HREF="doc_19.html"><IMG ALT="Next" SRC="next.gif"></A><BR><B>Go backward to </B><A HREF="doc_4.html">1 Introduction.</A><BR><B>Go up to </B><A HREF="doc.html">Top</A><BR><B>Go forward to </B><A HREF="doc_19.html">3 The GUI interface</A><BR><HR >
<H1>2 Getting started.</H1>
By way of introduction we will describe the program features that
are required for the simple data reduction process.
If you follow through this chapter, you should be able to
produce wavefront measurement from your own images with little difficulty.
If you are using the software at a new site you will need to define the
optical system you are using, this will probably require some research
on your part.
In our experience problems with <B>ef </B>can usually be traced back to
the use of optical system parameters which are slightly in error, or
images which are insufficiently defocussed. 
Laplacian Optics Inc. would be happy to review example extra-focal images from your system,
and determine if the optical parameters match the images.
If you have access to an anonymous FTP site, please place the images on this
site and contact us by mail at laplace@laplacian.com. 
If you do not have access to an anonymous FTP site please
<A HREF="http://laplacian.com/support.html">visit our web site</A>
for instructions on downloading images to Laplacian Optics Inc. .
<P>We supply <B>ef </B>with a pair of example extra-focal images which can
be found in the documentation directory in the sub-directory <EM>example</EM>.
In the following section we give step by step instructions for obtaining 
wavefronts from this data. The example data are computer generated 
extra-focal images assuming 0.5" seeing with the following 
wavefront errors.
<TABLE BORDER><TR><TD COLSPAN="1" ALIGN="LEFT">

Zernike name	</TD><TD COLSPAN="1" ALIGN="LEFT">Zernike Number	</TD><TD COLSPAN="1" ALIGN="LEFT">Amplitude (RMS nm) </TD></TR>
<TR><TD COLSPAN="1" ALIGN="LEFT">
Focus		</TD><TD COLSPAN="1" ALIGN="LEFT">4		</TD><TD COLSPAN="1" ALIGN="LEFT">1000		</TD></TR>
<TR><TD COLSPAN="1" ALIGN="LEFT">
Astigmatism	</TD><TD COLSPAN="1" ALIGN="LEFT">5		</TD><TD COLSPAN="1" ALIGN="LEFT">330		</TD></TR>
<TR><TD COLSPAN="1" ALIGN="LEFT">
Coma		</TD><TD COLSPAN="1" ALIGN="LEFT">8		</TD><TD COLSPAN="1" ALIGN="LEFT">-220		</TD></TR>
<TR><TD COLSPAN="1" ALIGN="LEFT">
Trefoil		</TD><TD COLSPAN="1" ALIGN="LEFT">9		</TD><TD COLSPAN="1" ALIGN="LEFT">-220		</TD></TR>
<TR><TD COLSPAN="1" ALIGN="LEFT">
Spherical	</TD><TD COLSPAN="1" ALIGN="LEFT">11		</TD><TD COLSPAN="1" ALIGN="LEFT">220		</TD></TR>
<TR><TD COLSPAN="1" ALIGN="LEFT">
High order coma	</TD><TD COLSPAN="1" ALIGN="LEFT">17		</TD><TD COLSPAN="1" ALIGN="LEFT">100		</TD></TR>
<TR><TD COLSPAN="1" ALIGN="LEFT">
</TD></TR></TABLE>

<P>On the original distribution CD, you will find a directory named
examples, which contains many other example images.
<P><A NAME="1">
In</A> the following tutorial it is assumed that the extra-focal images 
being reduced will be in standard FITS format. 
It is further assumed that there is a separate file containing each 
extra-focal image. 
The program can also unformatted image files containing no header 
information, provided the file name follows a convention
which allows the program to determine the image type and size. See
<A HREF="doc_36.html#1">reading an image file</A>
for more details.
<P><A NAME="2">
The</A> program remembers most of its settings, optical and data reduction
configurations and sub-window positions from invocation to invocation.
<A HREF="section:gun:properties">For more details</A>
.
<MENU>
<LI><A HREF="doc_10.html">2.1 Running the program.</A>
<LI><A HREF="doc_11.html">2.2 Bottom toolbar.</A>
<LI><A HREF="doc_12.html">2.3 Choosing an optical configuration.</A>
<LI><A HREF="doc_13.html">2.4 Loading the extra-focal images.</A>
<LI><A HREF="doc_14.html">2.5 Observing the program operation.</A>
<LI><A HREF="doc_15.html">2.6 Running the data reduction.</A>
<LI><A HREF="doc_16.html">2.7 Outputting the results.</A>
<LI><A HREF="doc_17.html">2.8 Controlling the display.</A>
<LI><A HREF="doc_18.html">2.9 Reviewing the calculation.</A>
</MENU>
<HR ><ADDRESS>Laplacian Optics Inc.&nbsp;&nbsp;&nbsp;&nbsp;  Email:&nbsp;&nbsp; laplace@laplacian.com</ADDRESS><BR>
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