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Forum: Pentax SLR Lens Discussion
09-10-2015, 03:24 PM
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I can see the situations where a faster zoom is very helpful, and also understand some users, particularly some professional shooters don't mind carrying big, heavy and expensive gear with them for the best IQ they can get.
But I still think most people don't need a super fast zoom lens that has corner to corner sharpness at largest aperture, which camera/lens makes are trying to make us believe we all need.
For example, when shooting concert in a really dark environment, I believe only the performers have light on them and the background is much much darker, usually. A fast lens has sharp center is good enough for that. corners are black or just have some light spots. We don't need good solution here.
same for shooting wide open for landscapes in low light: I guess most of these photos were taken at wide end, and in most case the upper corners are just sky with good color, and lower corners are dark ground. Most of these photos are good because of composing and color, not for its details in the corners.
Don't get me wrong, I think lenses that are sharp at largest aperture is useful and valuable, I just hope camera/lens makers don't forget the other side: sometime we need smaller lens even it is not optically perfect when wide-open.
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Forum: Pentax SLR Lens Discussion
09-10-2015, 08:40 AM
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I only wish, when camera maker producing such cameras, they still make some camera that has lower resolution, so we can buy and use.
To be honest, I still don't get it why so many people want to buy 36 or even higher megapixel cameras. Some commercial photographers need high MP, but 95% regular users, including professional photographers, don't really need that high number. Well, this topic has been discussed for many years, and I never won.
---------- Post added 09-10-15 at 10:54 AM ----------
It really depends what you want: A faster 1.4 lens has good enough center resolution and low line counts in the corner can give you: 1) brighter viewfinder 2) shallow DOV 3) faster shutter speed 4) creamer bokeh. 2&4 helps emphasizing the subject.
If these are not what you want, and you want corner to corner sharpness, F2 lenses makes great sense. That is why members here might have >10 50mm lenses. You pick the one can get the job done.
But my point is: in reality, I never found I need corner sharpness when I shoot F 1.4 or 1.8. In most case, item in the corner of a frame is not on the focal plane, unless it is a macro photograph. Macro lenses are so expensive for good reasons: good corner to corner sharpness, and flat focal plane.
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Forum: Pentax SLR Lens Discussion
09-10-2015, 06:49 AM
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That is right. fast lenses use to be "dreamy" when wide open. Good ones are sharp in the center and resolution does not have to be very good in corners when wide open, even shooting with film. Who need corner sharpness if you shoot f1.4? Best sharpness usually comes at F 5.6-8.
But now, people like to "test" lenses on 36mp sensor, because testing is free. So new lenses have to be sharp from F 1.4, which means a lot more glasses to adjust all kinds of aberrations. The result is what we see, monsters.
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