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Forum: Pentax SLR Lens Discussion
11-17-2009, 02:04 AM
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If you are still checking this thread, could you possibly see what the white balance is set to for the pictures? I find that the AWB picks way cooler colors when using old M/K glass, but equalizing white balance gives me fairly similar rendering between old primes and new zooms.
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Forum: Pentax SLR Lens Discussion
08-24-2009, 04:54 AM
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An entirely unscientific poll, with a small sample size of 4, shows that my acquaintances with a casual interest in photography all own a fast prime.
Two Canon owners both with the kit lens + 50/1.8.
A Nikon owner with kit lens + 35/1.8.
One Konica Minolta owner with a wide-angle zoom and a 50/1.4.
I think it just makes business sense to have a cheap fast prime in the lens lineup. When new buyers realize that their kit lens is not a low light monster, or when they see images with a totally OOF background, they will want to buy a cheap fast lens. Such a lens is of course also a very useful tool for more advanced photographers.
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Forum: Photographic Technique
08-13-2009, 12:44 AM
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My most common mistake is probably forgetting to turn off bracketing. I use one-touch bracketing, and it probably makes me look like a fool when the camera is still snapping pictures while Im lowering it.
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Forum: Pentax DSLR Discussion
08-09-2009, 09:48 AM
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Nikon does not overstate the ISO of their cameras, they just have a different distribution between shadow SR and highlight DR in their JPEG engine (the gray point is lower). Using the same lens, aperture, shutter and ISO, the D90 and K20D will both give perfectly well exposed shots, with middle gray objects having the same exposure. The K20D will actually have recorded slightly more light used to give more detailed shadows, while the D90 will have more highlight detail.
The DxO measure of ISO does not take proper exposure into consideration. Their ISO values are based on the light needed to saturate the sensor. If a camera maker adds one more stop of highlight dynamic range, DxO will consider the ISOs of that camera to be one stop overstated. This is obvious with the Fuji S5 that has incredible dynamic range, made possible by having 50% photosites with 4 stops less sensitivity. This sensor needs much more light to saturate, and as such, DxO considered this sensor to be ISO cheating by several stops. DxO has however made an exception for this camera, in the listings there is a "special info" button where you can read more.
The DxO way of measuring does make sense, kind of, when looking only at RAW files (where gray point and dynamic range distribution is up to the user). If Nikon were to use those results (and relabel their ISO 1600 as 1200, or whatever), the camera would not give a properly exposed (JPEG) image when used together with a light meter.
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