If you need powerful acceleration, it is a great car.
If the acceleration is good, I will buy it.
If the camera was robust, I would buy it.
If the camera had been robust, I would have bought it.

If you don't enjoy this film, then you just don't like action movies.
Even if the camera had had good battery life, I would not have bought it.
If the camera was not so expensive, I would buy it.