If youre on the go and would rather post your pictures to 500px without running them through Light Room first, the photo-sharing apps latest iOS update addresses just that. You can now upload iPhone shots directly from the application, and all you need to share DSLR pictures without a PC are an iPad and its SD-card reader. Theres a step-by-step guide on the developers website should you need it, but the entire process is pretty straightforward.