Override sitewide default layout for Blog posts only?

Hi, Thanks for the help with putting the title over the header image - it is looking great. I have run into something else I am hoping you can give me a solution to. For the site in general I have Theme Options > Layout Option > Default Layout set to No Sidebar (Content Width) which works well for everything except Single Blog Posts. I have specific sidebar content that should only appear in the blog section and was hoping you might be able to provide the correct code for me to override the site default for the Post content type so that authors don't always have to open and set it in the Full Frame options when they blog. I was thinking it might be as easy as adding a conditional statement to my child theme function.php or sidebar.php? Let me know if you think this is possible and how to go about it. Thanks! heather