Originally posted by bdery The IQ of zooms have improved, but so has the IQ of primes...
The IQ of zooms has improved exponentially more so than the IQ of primes in these last 10 years--no contest.
Quote: bdery: Primes are also smaller, can be faster and make you shoot differently.
Yes, everyone knows primes are smaller and lighter, but the OP asked about IQ.
Quote: normhead I wonder about you guys saying you are more creative with a prime. If you have a zoom, you can still pick the focal length you think suits the shot, mess around all you want, then change focal lengths and do it again. The difference between primes and zooms is, with zooms, you don't have to take the lens off the camera to do that. As for lens quality, the only Pentax prime in it's range that has a chance of out performing the 60-250 in it's range would be the 77 1.8. The 200mm isn't close. At least that's what the numbers on photozone say. I agree different lenses have different characteristics and that there's more than image resolution to a lens. But I'd suggest that primes have no intrinsic advantage in that regard.
Agreed, wholeheartedly. The days of primes are past their prime. Some zooms are outperforming primes these days.
Quote: JHD: In every hobby there are value packed high performance alternatives that seem to defy the law of diminishing returns. The DA16-45 is such a product. Don’t let anyone have you believe otherwise.
Yes indeedy!
Quote: GeneV: Agree. On the other hand, the IQ of good zooms has increased so much that it seems to me that almost all the lenses are capable of IQ that is as good as I need. Pentax primes are usually smaller and are often faster, though. I still prefer them.
But the OP is focused upon IQ, not size & weight. The only real advantage of a prime is if you absolutely, positively have to have very large apertures for shoots. Portraits, with shallow DOF, come to mind here, otherwise, the incredible ISO performance of recent digital bodies reduce the need for large aperture lenses--Again,
unless you have to have shallow DOF. Even then, from what I hear, some software is getting good at mimicking the shallow DOF look.
Quote: sjwaldron From photozone.de
DA 15 F4:
Barrel distortion: 1.5%
Vignetting @ F4: 1.3 EV - 0.33
MTF @ F4: 2308 - 1580
MTF @ F5.6: 2352 - 1716
Chromatic Aberrations: 0.69 - 0.8
DA 16-45mm @ 16mm:
Barrel distortion: 2.5%
Vignetting @ F4: 1.17 EV - 0.59
MTF @ F4: 2281 - 1741
MTF @ F5.6: 2321 - 1863
Chromatic Aberrations: 2.3 - 0.52
Yes, there can be distortion gains in a prime as well, but you have taken the 16-45, at its weakest link, 16mm, and presented its performance here. What about 17, 18, 19, 20........up to 45mm--what about a performance comparison here to the 15?
What is amazing, even at this weak link of the 16-45, is the 16-45 is actually a little better on the MTF scores than the 15 limited.