Camellia Leaf Browning

Hard to tell. Could be salts in the soil or poor drainage. Are there drainage holes in the this pot? If so, leach the soil by watering heavy and allowing the water to drain out completely. If it is in a saucer, do not allow plant to sit in a water-filled container. Here’s some info from UC that may help: http://www.ipm.ucdavis.edu/PMG/GARDEN/PLANTS/camellia.html
A local nursery may also be able to help. Also feed your Camellia with an acid fertilizer formulated for Camellias during it’s growth period which is now and feed one more time toward the end of summer or beginning of autumn before it forms flower buds. Once the flower buds form the plant is dormant and should not be fed until after the flowers are spent. We hope you get blooms in the winter or early spring!