Now you can search your own Flickr photos by camera model. Strangely, Flickr has had the ability to search public photos by camera model, but not your own private photos by camera model.
So, I have created a little tool that does the work for you at: http://benjf.com/flickr_searchr/. Simply fill out the form and it populates a link for you, as you type. Just click the link and you will be taken to the Flickr page with the photos you are looking for.
You must be logged in to Flickr for the link to show your photos.