When you use this lens, the focus ring will stick and get stuck making it almost impossible to use. Shortly thereafter, the front half of the lens fell out completely. I sent the lens back to Rokinon for repair or replacement under warranty and they told me I should have contacted them sooner and the damage was my fault, although it was clearly an internal manufacturing defect and they offered me an additional payment of $300. to a new lens after paying >$400 for the defective one. Less than a month later, another lens I bought from the same company (24mm) also broke when the lens completely detached from the mounting ring without warning. I contacted Rokinon straight away and they then told me that they had seen this before and that it was extremely unlikely (how could it be both?) and it was also not covered by the guarantee, although they pretended it was just one Problem with loosening screws from the mounting ring. How can such a simple problem not be covered under warranty? Do not buy Rokinon lenses
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