chris_mcnulty2

<p>Thanks Jim. You are quite right. Fat fingers on my part. <br> I take the point on the image circle data. It might not be useful to everyone. I have included it as the vignette effect can desirable.<br> Have I left anything out that might be useful.<br> Obliged<br> Chris</p>

<p>I have been writing a guide building pinhole cameras on my website. I hope this is of some interest or help. <br> If any of my figures seem crooked I'd appreciate a pointer also willing to take any questions or suggestions.<br> Cheers<br> Chris</p> <p>http://papercamera.co.uk/what-size-should-a-pinhole-be/</p>