A:AnswerMaybe. This is a very lightweight tripod. It is better for smaller crop sensor cameras. If you are using a smaller lens, then maybe. If using a longer lens, then probably not.
A:AnswerThis will work with any camera that uses a standard tripod mount. However, this is a lightweight tripod, and should not be used with cameras over 4.4 pounds.
A:AnswerThe camera adapter uses common 1/4-20" thread. If your Sony has that, then it should work. I suggest taking the camera with you to the store and ask for assistance from store personnel.
A:AnswerProbably, but it most likely will not able to hold the weight of the iPad unfortunately. Can't speak from experience, but used it with a compact camcorder, and it didn't feel stable even with that.
A:AnswerAssuming your t3 has the standard bottom that allows for a screw from the tripod to attach itself to your camera, then I expect that the t3 can be used. But I would check on the weight of your t3, and remember to also include the weight of your heaviest lens. I no longer have the box, but the tripod is only recommended for cameras up to a certain weight. My Olympus camera was underweight, but once I was using the tripod I worried that a long, heavy lens would not be stable on this tripd since it is so very light weight. Of course the makes it nice to carry in your backpack. If you do use a long lens, be *sure* you line up one tripod leg directly under the long lens. This should improve the tripod stability.