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Hello, I am having problems using an external flash that is automatically triggered by my camera´s flash. The problem is that my D3100´s flash shoots twice. Therefore, the external flash shoots together with the first flash and the not with the second one (the one used to take the photo). How...

Hi, I was wondering whether the focus stays the same if I zoom out. In other words, if I zoom in in order to focus precisely on a object (55mm) and then zoom out and take a photo (18mm). thanks, Ivan