Thanks I went to google first of all. They seem to be really good but run only once or twice a year and not for specific dates. I am now looking at your second suggestion of just scoping out my own "tour". When I asked the question in the OP I wasn't sure how Yosemite "worked". I shall be investing more time into this via google research.Google shows a few companies that do photo tours.
Depending on what you have in mind a photo tour may not be necessary, Yosemite is quite easy to get around and even the tours that they have onsite take you to a lot of the classic spots.
thanks are there really that many "sights" that would fill up a card in a day (plan on taking the editing machine too)Seconded on easy to navigate. Lots of signs pointing you to the classic locations, and when I went (2006) - pretty much anywhere we stopped the car you could just get out and get amazing images. Take lots of cards though!
are there really that many "sights" that would fill up a card in a day