goldpompon писал(а): Ср авг 02, 2023 16:47
Была в своё время такая старушка, называлась SIGMA SD1. Так вот выдаёт она на гора 46 МП. Видел как то картинки с неё, да такие, что по детлизации никоны нервно в сторонке курят. Недостаток этой камеры низкий ИЗО порог, и это не удивительно при такой кропнутой матрице (23,5 x 15,7 мм), такое количество мегапикселов.
Obviously the Sigma's defining feature is its 15x3MP Foveon sensor. For those of you who haven't come across the technology before, it uses a fundamentally different method for detecting color than any other camera sensor. Almost all other cameras place a pattern of colored filters in front of their sensors so that each individual photo site is only receives either red, green or blue light. To create a full-color pixel in the final image, clever mathematics is applied to estimate the values of the two unmeasured colors, based on the amount of those colors captured by adjacent photos sites.
Foveon's technology doesn't use filters - instead it uses the fact that different colors of light can penetrate silicon to differing extents. Foveon's chip measures the number of photons captured at three different depths corresponding to how well Red, Green and Blue can penetrate the chip. The main advantage of this is that, unlike other digital cameras, the Sigma measures all three colors at every one of its 15 million photo sites, capturing three times as much color data per-pixel as a conventional sensor. (Hence the company's reference to it being a 46MP camera.)
Because the Foveon sensor captures full color data at each pixel location, it's not susceptible to color moiré - false color patterns that are the result of those clever calculations occasionally getting things wrong, for example with finely-woven fabrics. Traditional Bayer-pattern sensors suppress this by using an optical low pass (or anti-aliasing) filter that slightly blurs the image at the pixel level, reducing the camera's resolution. The Foveon sensor doesn't use an AA filter, and is therefore able to resolve substantially more detail than its pixel count alone might suggest - in principle the SD1 has the potential to produce resolution similar to a 30MP Bayer-type sensor.
Вроде недавно Сигма сообщала, что работы над ФФ сенсором Фовеон таки ведутся. Может, когда-нибудь и допилят.
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