Sharpness - Z vs F

Started 3 months ago | Questions thread
FingerPainter Forum Pro • Posts: 10,375
Re: Sharpness - Z vs F

LivingPicture wrote:

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Soon, I´ll be the owner of a new Z7ii (had the D750)

Sharpness question: Z 24-200mm f/4-6.3 on a Z7ii vs Tamron SP 70-200mm F/2.8 Di VC USD G2 on a D750 ?

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You'd need to find some reputable review site that has measured the sharpness of both camera/lens combinations, using the same methodology on both.

Ir wouldn't be too unreasonable to guess that the 70-200mm is sharper than the 24-200mm. But it is a lock that a 46MP sensor produces a sharper image than a 24MP sensor. Only if the 70-200mm is more than about 40% sharper than the 24-200mm will the Tamron/D750 combo be noticeably sharper, but I don't have any data on that.

What I can tell you for sure is that the 24-200mm lens is always sharper from 24-67mm, and the 70-200m is always sharper from f/2.8 to f3.5.

ephotozine.com has reviewed both lenses, but the Tamron was measured on a Canon 5DS R so the sharpness results will be rather higher than on a D750. Also the same focal lengths were not used for both lenses. It shows the 24-200 to be sharper in the centre at 50mm than the 70-200 is at 70mm at all apertures they have in common and sharper at the edges at f/8 and larger f-numbers. Comparing 100mm on the Tamron to 105mm on the Nikkor, the Tamron measures ~10% sharper at f/5.6 and f/8 than the Nikkor at f/6.3 and f/8 in the centre and edges, except, at edges wide open, the Nikkor is significantly worse. By f/11 the Nikkor has caught the Tamron. Measurements at 150mm on the Nikkor and 135mm on the Tamron show similar results to at 100mm and 105mm. The Tamron's edge performance is closer to its centre performance, but the Nikkor is actually sharper in the centre from f/11. Once you account for the higher resolution of the 5DS R, the Nikkor on a Z7II probably beats the Tamron on a D750 everywhere but at the edges wide open. At 200mm, the Nikkor is sharper than the Tamron in the centre from f/8 up. At the edges, the Tamron is consistently better, but perhaps not by enough to be better on a D750 at f/11 and above.

Ir wouldn't be unreasonable to guess from this that the 24-200 on a Z7II is sharper overall than the Tamron 70-200 on a D750 except wide open at the edges at about 135mm and longer.

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