I've got a Holga turret lens for my Nikon D3000 (http://www.amazon.co.uk/Holga-Turret-Nikon-D7000-D5200/dp/B00ABGNDAM/ref=sr_1_1?s=electronics&ie=UTF8&qid=1358686248&sr=1-1) and I've attached it all correctly and put it into manual mode because otherwise the screen shows that there is 'no lens attached'.
However, when I look through the viewfinder I can't see anything, it will take images but they come out completely black. There is nothing to obscure the front of the camera.
What can I do so that I can get my new lens to work?
Added (1). It doesn't matter how much i fiddle with the exposure/shutter speed, images are always coming out black
>>> Help with holga turret camera lens?