Have you gone through the tutorial yet: 
http://hugin.sourceforge.net/tutorials/calibration/en.shtml and/or 
http://wiki.panotools.org/Calibrate_lens_gui

The image doesn't have to be anything special, just go outside and take 
a picture of something with known straight lines.  In my case I just 
took a picture of the security bars on one of my windows.

You can also make a grid or star burst pattern with the GIMP and then 
take a picture of your screen.

Brian

On 08/08/2016 12:23 PM, Michael wrote:
> To calibrate a lens Hugin wants a picture with straight lines. Cool; I 
> fed it one and it found two on X and one on Y.  believe it would be 
> better to have more. I want an image of a starburst that radiates to 
> the edges of the paper. I spent about half an hour looking but the 
> webpages that had one I liked wanted you to sign up for something. 
> Does anyone have something I am talking about>?
>
> -- 
> :-)~MIKE~(-:
>
>
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