Does a pretty good job at simulating different f-stops. My main issue is that when you take a photo withe the app, it doesnt save a working copy. I spent about 10 minutes meticulously selecting the area I wanted to keep in focus. I then went to save the photo and it crashed. When I restarted the app, the photo was gone. Very frustrating.
Until they fix this I would suggest taking photos with the iPhone camera, then loading it into Big Lens.
I would also like to see a little bit more accuracy around auto-masking, just for handiness.
Still worth checking out.
Hemant Naidu about Big Lens, v1.0.1502.1