Having spent most of the morning yesterday at Nikon’s PR Event in Covent Garden, London for the D5100 product launch, I couldn’t help but compare all the ‘special effects’ mentioned with some of the incredible iPhone photography apps available. It is amazing that despite a 16.2 megapixel CMOS sensor and 1080p video recording mode plus Nikon’s incredible build quality that that’s not enough these days. Even Nikon are recognising that themselves and have packed out their latest DSLR with special effects, including monochrome night vision, HDR, tilt-shift etc. We’re not suggesting that the iPhone is a match for a DSLR but as we all know the best camera is the…