Having a weird issue and I'm sure it's got something to do with the way my script is grabbing the value of the file input field.
I know the controller function works because I've been able to do it by manually submitting the form without using ajax.
I also know the ajax works in sending and receiving the request because I tested it by modifying it to parse a string back and forth which worked.
Additionally I can see that the script is grabbing the file as when I select a file, it shows the selected file in the console.
In my browser I'm getting a 500 error and in Laravel I'm only getting this:
Symfony\Component\Debug\Exception\FatalThrowableError: Call to a member function getClientOriginalExtension() on string in C:\123\app\Http\Controllers\MyController.php:156
I've tried updating the controller to use Request->logo instead with no success.
View:
<form enctype="multipart/form-data" class="form-horizontal" method="POST" action="{{ url('studio/uploadLogo') }}">
    {{ csrf_field() }}
    <div class="form-group{{ $errors->has('studioname') ? ' has-error' : '' }}">            
                <label for="imageInput" class="col-md-4 control-label">Logo</label>
                <div class="col-md-6">
                    <input data-preview="#preview" name="logo" type="file" id="imageInput">
                    <img id="preview" src="" style="display: none"></img>
                    <input class="form-control" type="submit">
                </div>
            </div>
        </form>
Script:
$('#imageInput').change(function (e) {
    e.preventDefault();
    var logo = $('#imageInput').val();
    console.log(logo);
    $.ajax({
        type: "POST",
        url: '/studio/uploadLogo',
        data: {logo: logo},
        success: function( data ) {
            console.log(data);
        }
    });
}); 
Controller:
public function uploadLogo() {
    $file = Input::file('logo')->getRealPath();
    $photoName = str_random(20) . '.' . Input::file('logo')->getClientOriginalExtension();
    Input::get('logo')->move(public_path('avatars'), $photoName);
    $response = array(
        'status' => 'success',
        'data' => $photoName
    );
    return \Response::json($response);
}
Routes:
 Route::post('/studio/uploadLogo', 'MyController@uploadLogo');
 Route::get('/studio/uploadLogo', 'MyController@uploadLogo');