For example, if they predict that a new lens will be released, which will make a lot of money, or have a slightly positive impact on the war, then Canon will definitely launch a new lens.
If a competitor, such as Sigma, introduces a 50mm lens with similar price and superior performance, no one will buy Canon 50F 1.4. Rich people buy 50L, poor people buy small spittoons, and those who can afford thousands of dollars buy suitable horses. Can Canon bear it? Therefore, there is still a market for 50F 1.4, and its performance can keep up, so there is no need to introduce a new one.
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The new lens needs research and development. Obviously, whether a shot needs to be updated is not the main factor to be considered. But whether its performance meets the needs of people at present and the factors of competitors.
In 2007, it was reported that 16-35F2.8L II was likely to be released in the third generation, which is only eight years now. Obviously, this is not because of time.
Personally, I guess that the next generation of 50mm F 1.4 USM may be above 4000.