Did you know the Magic Lantern firmware update for the EOS 5D Mark III delivers a 3x crop factor and that it doesn’t come at the cost of a loss in image quality?
Photographer and filmmaker Luke Miller shot “Sun Moon London” using the EOS 5D Mark III along with a Sigma 150-600mm f/5-6.3 lens, installed Magic Lantern, and finally used a Sigma 1.4x teleconverter. You can easily do the math: 3x crop factor makes the 600mm of the Sigma become 1800mm, plus the 1.4x converter and here are the 2520mm.
Says Luke Miller:
I was always curious just how far this effect could be pushed and then I discovered there was a feature within Magic Lantern that gave a 3x crop factor without any loss of quality […] Suddenly my 600mm became 1800mm and I felt that this could possibly make for something visually interesting.
Yeah, it’s definitely visually interesting. Kudos!PetaPixel]