Several places in FamilySearch.org display a photo icon or thumbnail. It means you can see an image of the original document online if you click the icon.
Begining November 2, 2015, users of the FamilySearch Catalog viewing an indexed film with unrestricted images will be able to use this feature to
1) jump to the indexed records on that film,
2) jump to a gallery of images from the film,
3) jump to microfilm ordering.
FamilySearch has a plan for the future that includes digitizing and publishing all the aviable microfilm in the Granite Mountain Record Vault. When done, the published rolls of microfilm will no longer be copied and circulated. They will become 'digital microfilm.'