OEM lenses are often globally (optical + mechanical) better than thirty party lenses but it rarely translate on the print.
When an OEM lens has an optical flaw, we say it has a « signature ». With a third party lens, we say it has a defect or a weakness.
The spot where having very high resolution matters is when using with a teleconverter.
That's for sure, but just as with lenses there are differences in the optical quality of tele-converters too -- with anywhere from three to seven elements.
Then there was a third party (Vivitar branded?) 28mm lens that was reputed to be excellent and definitely deserved the reputation.
I have had my share of lenses through the years .
Some name brand lenses and some third party lenses that I have owned have been deemed, on the internet, to be substandard.
My experience would suggest that whilst there are some stellar OEM lenses there are many third party lenses of equal or better performance.
What are your experiences ?
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