Bryan Randall died aged 57 after being diagnosed three years ago with amyotrophic lateral sclerosis (ALS).
In a statement, Randall's family said they were "immensely grateful to the tireless doctors who navigated the landscape of this illness".
Bullock was also praised for her care by her sister Gesine Bullock-Brado in a tribute she posted on Instagram.
"ALS is a cruel disease," she wrote, "but there is some comfort in knowing he had the best of caretakers in my amazing sister and the band of nurses she assembled who helped her look after him in their home."
"I'm convinced that Bry has found the best fishing spot in heaven and is already casting his lure into rushing rivers teaming [sic] with salmon."
Randall's death was first announced in a statement his family released to People.
The family said the photographer "chose early to keep his journey with ALS private", adding: "Those of us who cared for him did our best to honour his request."
ALS is the most common form of motor neurone disease (MND).
The family's statement continued: "We are immensely grateful to the tireless doctors who navigated the landscape of this illness with us and to the astounding nurses who became our roommates, often sacrificing their own families to be with ours.
"At this time we ask for privacy to grieve and to come to terms with the impossibility of saying goodbye to Bryan."
Sandra Bullock is best-known for films such as Speed, Gravity and Miss Congeniality, and won an Oscar in 2010 for her performance in The Blind Side.