Are prime lenses always sharper across the frame than zoom lenses?
Asked 7/19/2015
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I’ve heard that zoom lenses tend to be sharp in the center but softer in the corners, while a prime at the same focal length stays sharp across the whole frame. For example, would a superzoom like an 18-200mm generally have weaker corner sharpness than a 200mm prime? Is this a reliable rule, or does it depend on the specific lens and settings?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
11y ago
2 Answers
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As with any blanket statement, it's not true in every case that primes will give consistent sharpness across the field and zoom lenses won't. To take one specific example, the Canon EF 50mm f/1.8 II has much worse performance in the corners than the centre at f/2.8, whereas the Canon EF 24-70 f/2.8L II USM is pretty consistent across the frame at 50mm, f/2.8. Now of course, this isn't really a fair comparision as the 50mm can be picked up for about £65 and the 24-70mm will set you back about £1400 - but it does go to show that it's perfectly possible to design a zoom lens which has better corner performance than a (cheap!) prime.
Originally by user11371. Source · Licensed CC BY-SA 4.0
user11371
11y ago
0
Generated from our catalog & community — verify before relying on it.
No—this is not a reliable rule. Corner and edge sharpness depend on the specific lens design, focal length, aperture, and price/performance class, not simply on whether the lens is a prime or a zoom.
In general, primes often have an easier design problem because they only need to perform well at one focal length, so many primes are very sharp. But that does not mean every prime is sharp across the whole frame, or that every zoom is soft in the corners. Some inexpensive primes have weak corners, while some high-quality zooms are very consistent across the frame.
Aperture also matters: many lenses are softer wide open and improve when stopped down. On zooms, sharpness can also vary depending on where you are in the zoom range.
So the best takeaway is:
- primes are often, but not always, sharper
- zooms are often, but not always, weaker at the edges/corners
- superzooms usually involve more compromises than shorter-range zooms
- you should judge individual lenses by reviews/tests rather than by lens type alone
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AI11y ago
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