Let $S$ be an integral Dedekind scheme.

Let $f:X\longrightarrow \mathbf{P}^1_{S}$ be a finite flat surjective morphism, where $X$ is an integral normal scheme. 

Let $\eta$ be the generic point of $S$. Note that $f_\eta:X_\eta\longrightarrow \mathbf{P}^1_{K(S)}$ is a finite morphism of curves over $K(S)$.

Question. Is $f$ the normalization of $\mathbf{P}^1_S$ in the function field of $X_\eta$?


Question: Can a Canon T3 DSLR be used with my TAMRON AF TELE-MACRO 90-300mm lens?
Answer: You can use this lens, with a few trade offs.
1. You will have to buy a lens mount adapter. Try searching the mount it is in "to canon ef" on amazon.
2. Neither autofocus, nor auto exposure will work for this lens. This is because the adapter won't have electrical contacts. Depending on the lens, it may be possible to find an adapter with the contacts, but it will probably cost about ten times as much. 
Despite these trade offs, using an old lens is great! I use an old 50mm with my canon, and using manual focus forces me to be more creative. You also save a lot of money, by not having to buy a new lens.