Hi Colin, Doug... I wanted to post a link to one of your previous blog documents on another forum (SB) to help with an imaging artefact issue but the link is now broken (error 404). http://diffractionlimited.com/flat-fields-stray-light-amateur-telescopes/ Looking at the blogs page the '404' error occurs also if you try to access page 2 http://diffractionlimited.com/blog/ Regards. William.
There was something not quite right in the server's settings for that article. I adjusted some settings and it should be visible now. Page 2... I'll ask @Adam Robichaud to have a look a that.