They have to decide between a good performing lens at a little lower price point or a very high performing lens at a significantly higher price point. Lens manufacturers are often caught between a rock and a hard place. I love what Roger shared in his articles about lens variation. With other products it can be more meaningful. With some products those variations are so negligible they really do not matter. Whatever the reason for the variation, there is going to be some in the results of every manufacturing process.
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These variances can be the result of cost cutting measures, or the result of technical limitations where we simply do know how to do it any better. Yet, as amazing as modern manufacturing processes are, they have been deliberately built to allow for small variations in the final product. I think it is a miracle that the cameras and lenses we have work at all. I am thoroughly amazed at modern manufacturing processes. The science and data really takes the controversy right out of the topic. I will similarly point to this post when I see this come up in forums and groups going forward. Roger starts off his first article by saying he wants to answer the “ seventh most common forum war the ‘lens variation is a big problem!’ vs ‘I don’t believe it exists!’ argument”. He works for and has an amazing amount of experience and unbiased opinions backed up by science and data. Due to this bias, I am glad there is someone like Roger who can speak to this as more of an expert than almost anyone else on the planet. Great quality at a very reasonable price! Speaks right to my nerdy hobbyist heart. I know I am personally biased towards Tamron.
Difference Between Sample Variation and Bad Copies Part 2 Why Lens Variance vs Bad Copy?.Difference Between Sample Variation and Bad Copies Part 1.
This post was heavily influenced by and will reference an excellent two part article that the great Roger Cicala published at in 2020.
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