Originally posted by zoolander No, I believe that the Pentax AF system is precise, its just not super-quick. But if its all over the place, then that doesn't sound right. Your screw drive lenses should be perfect as far as I am aware. I asked the forum a while back about my sigma 10-20 f4-5.6 which would back focus only at f4 (it was fine on the other apertures). I gave it to Sigma to fix, and they also wanted my K-5 to calibrate it to the lens, but I didn't give the K-5.
In my thread, folks talked about having problems like you describe, and stating that that was the severe case of the AF system going haywire, and in need of repair.
In my case of my Sigma lens, what is needed is USB connectivity to the lens, so's that the ROM chip in the lens can have its firmware updated. Thats why I believe all these products SHOULD have USB connectivity, like flashes and lenses.
If I were you, I would create a new thread describing what is happening with your camera, and people will tell you if you've got a problem and how to address it.
My simple test is to put the camera on a tripod, set the lens to infinity (set the aperture), and see where the focus ring ends up. I then switch it to live, set the lens to infinity, and see if the focus ring ends up in the same spot, and also whether both the image are in focus. The live view auto focus is very accurate, the phase detect AF works off a separate sensor. If the phase detect sensor is messing up, its either the phase detect system going bonkers and it needs to be fixed or re-calibrated, or the firmware needs to be updated in your camera. Maybe also the firmware in the lens itself - regardless of whether the lens is screw drive or has an internal focus motor.
I do not think the phase detect sensor being too big as being the problem, I think the problem is that they weren't big enough, and needed more pixels and better programming. The guys writing the firmware for cameras, need to have the camera communicate with every lens. It could be a matter of firmware support - i don't know for sure.
Just post a new thread, and describe those symptoms of your camera.
Thanks. I will have to do some tests... it's been relatively consistent when doing tests, but in the real life I have no clue what the sensor is focusing on... something around the center, but if there are different depths around the center then it could be anywhere... something will be in focus near the center, but who knows what... A precise representation of where the focus sensor is, and how big it is, would help tremendously.
The way I read the Nikon interview they simply are unable to do 4K at this point... he refers to the image processor, and Fujitsu hasn't announced that their Milbeaut does 4K. I guess it's safe to say that it doesn't, and as long as it doesn't, Nikon (and Pentax for that matter) won't be able to deliver it.
That he thinks 4K is too much is foolish, IMHO. Even for content that is not released at 4K it gives big advantages... 1080p is often not really 1080p, it is rather soft on many cameras. 4K, downscaled to 1080p is usually much sharper. Also it allows for crops. Simple example would be an interview or something like that, with the camera mounted on a tripod. To make it visually a bit more interesting you can occasionally crop in, select a different crop, show the full image, etc., without losing quality.
In the end he criticises Fujitsu again... their processors aren't fast enough. I've said it before, and I'll say it again: It's time that cameras get proper processors. Samsung has done that, as they are able to do it. Canon to a certain degree too. It's harder for Pentax and Nikon. Basically Canon has a processor system that is scalable, so if they need more performance they can, to a certain degree, improve it by using several processors. I doubt the Fujiltsu Milbeaut is capable of that. Samsung has based their DRIMe V on their Exynos line of smartphone SoCs, sadly there's not much info around, apart from the ancestry and that it's a quad core CPU. I'd expect something pretty fast. The latest quad core Exynos is the one used in the S5 Mini, which is probably a mid range CPU for smartphones, but compared to a Milbeaut? I guess there's not much competition. Other Exynos CPUs are usually quadcores these days, though they are of the big.LITTLE type, which combines 4 high end cores with 4 lower end ones meant for energy saving. It'd be very curious what a DRIMe V actually is... I have the feeling it is something that is even ahead of their smartphone CPUs. None of the Exynos processors is capable of HEVC/h265 recording, only playback.
Perhaps the solution for Pentax and Nikon could be to go to Qualcomm for a new imaging processor. The Qualcomm Snapdragon series has plenty of oomph (the 801 and 805 basically power every top of the line smartphone out there), and they have an image processor too, which is capable of something like 55 MP sensors IIRC. Maybe combine it with a Milbeaut, maybe replace the Milbeaut, work with Qualcomm to create a version meant for DSLRs...?
Btw.,
Image Sensors World: Samsung APS-C BSI Sensor that's a bit of detail on the 28 MP sensor used in the Samsung NX-1.
http://www.dpreview.com/articles/0661793352/photokina-2014-sony-interview-we...te-more-lenses
The Sony interview, should be interesting too.
"No. From what I’ve heard, in recent years a lot of professional photographers have needed to start creating video as well as stills - doing two jobs. One camera which can do both - like the A7S - is potentially better."
Someone go tell Pentax.