This iPhone dSLR mount from PhotoJoJo allows you to connect any Canon EOS or Nikon SLR lense to your iPhone 4. The pitch is that you don't have to pay for an expensive dSLR camera body, instead, just connect your iPhone 4 to this $250 kit and attach just about any modern SLR lens on the market. Boom, real depth of field and manual focus. There's even loopholes so you can hang it around your neck, you know, like a real camera.
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