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Forum: Pentax K-3 & K-3 II
08-09-2016, 06:50 AM
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The micro lens array and filter stack are something laid on top of the silicon sensor, after the silicon chip is finished and ready. Its the silicon sensor part that is extremely expensive to change and thus requires large production series to be economical. The filter stack and micro lens array are a lot cheaper to change according to a customers wish. Even for relatively small series (a few thousands of cameras). This is the reason we see a lot of sensors with the same pixel count and size, but with various features like optimizations for different register distances, color filters (some H-a sensitive astro cameras or even monochrome variants), different on sensor PDAF numbers, with or without AA-filter and so on.
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Forum: Pentax K-3 & K-3 II
08-09-2016, 05:38 AM
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Regarding high ISO noise. There are physical limits to how low the noise can be (shot noise), and modern sensors are quite close to that limit. There is little (read noise) left to improve. Yes, there are still some small improvements that can be made, but the main high ISO noise "improvement" are faking ISO numbers. For example ISO 1024000 may actually be ISO 2048000. This is legally possible since the ISO standard don't define ISO good enough. This is the main reason some new cameras can claim to have extremely high ISOs. These improvements are mainly done at very high ISOs and show little to no effect at low ISOs.
I don't mind having extreme ISO numbers, but I prefer them to be real. I also don't care about noise at claimed ISO, i care about noise at real ISO.
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Forum: Pentax K-3 & K-3 II
08-08-2016, 01:45 PM
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Pentax usually buys sensors from Sony and their A6300 sensor might be on sale. Of course with Pentax tweaks. The silicon chip is of course not hardware adjustable, just software configurable, but the color filters, whole sensor filters and partially blocked pixels (PDAF-pixels) is possible to tweak according to what Pentax wants. If Pentax want different filters or no PDAF-pixels, the same silicon may be used. The main advantage this chip has over earlier ones are speed. Som might say 8,3 fps is enough, but speed are more then that. Speed also means 60 fps 1080p, 30 fps 4K, and faster pixel shift sequence. Video will also get less rolling shutter effect.
I didn't find out who made the sensor in Nikon D500, but that might be Sony as well. This sensor, with Pentax tweaks, may also be a candidate for Pentax K-3III. This sensor have slightly fewer pixels (20,9M) and much of the same speed properties as A6300 which are good for both video, pixel shift, and if anyone cares, sports too.
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Forum: Pentax K-3 & K-3 II
08-07-2016, 05:03 AM
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There are many ways Ricoh may take the K-3 line. Here are some of my thoughts on what Ricoh may choose to do. Pick your guesses.
- New sensor. Pixel count may increase for higher resolution or decrease for higher speed.
- PDAF on sensor
- Fast hybrid focusing (combining on and off sensor PDAF focusing) optimized for KAF4
- 4K video
- Video AF
- Vari-angle screen like its big brother
- Body lighting
- Return of video SR
- Both flash and GPS
- New body shape
- New control wheel (for consistency with K-1)
- Bumping the burst speed. Possibly introducing mirror lock up live view high speed mode.
- Better Wifi features
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