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Lack of sharpness at f1.8 on Canon 50mm STM

Started 4 months ago | Discussions thread
John Sheehy Forum Pro • Posts: 26,698
Re: Similar to your story, my Canon 50mm f/1.4 super sharp but not at f/1.4

Tannin wrote:

Note that some lenses are so beautifully made that you can ignore the normal rules. I habitually shoot a Canon 600/4 wide open at f/4 for example, I expect perfect sharpness at f/4, and get it. But it weighs 4 kilograms and cost $15,000.

This is why generalizations are wrong. I read all the time "lenses are sharpest at f/8" or "lenses are sharpest 2 or 3 stops down from open", and I think of my 400/4DO II, which is sharpest wide open, at f/4.

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Beware of correct answers to wrong questions.
John
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