Hi,

I am new to this forum or should I say I am new to everthing regarding to photography. Nikon 5700 is my first prosummer camera and I pretty much learned everything about it (hopefully).

I am trying to figure out if something is wrong with the new lens (Bower .42x) I bought or it's just the way it supposed to be or I just don't know how to use it. So I have a bunch of questions to ask:

1. The macro lens is part of of the whole lens. I assume that just leave them attached and use them for both wide and macro shot. I am right?

2. After screwin on the lens, the tube adapter and set the menu to proper type of lens, I see a black circle around the image until I zoom in a little. Is that normal? If that is, isn't it kind of defeats the purpose of getting a fisheye lens?

3. The pictures turned out fine except for the corners. They are blurry. Is this normal when using wide lens? if not what did I miss. The instruction said to keep the lens opening as little as possible and set focus to infinity. Does "keep the lens opening as little as possible" means I have to zoom in? I noticed with the wide lens installed, I can't zoom in much, else the camera will say something like "faulty lens setting" and lock up.

4. I bought this lens for cheap ($45) as I've also seen others with this price range. Why these lens are so cheap compared to the others that are much larger and cost from $500 to thousands. May be these expensive lens are for SLRs only?

Thanks in advance.