Let me play the devil's advocate.
Looking for a smartphone to capture videos, as per title.
With the following minimum specifications:
(1) Minimum aperture f/29, max shutter speed 1/8000
Ans:
Is it feasible to use f29 even if it is possible when for all intents and purposes the lens will be a wide angle where the depth of field is a given. As for 1/8000th shutter, this will be implemented electronically scanning line/row by line but subject to the processing power of cpu. Any good processor is capable to 1/16000th. sec. Where phone give option to select speed is another question. You want to minimise rolling shutter effects?
(2) Dynamic IS, 5 Axis image stabilization.
Ans: without resorting to a gimbal?
You are in luck as oppo has announced model Oppo Find X5 Pro.
(3) At least 60fps in full HD 1080p
Ans: Easily doable on most good phones by now.
(4) Decent clean motion image quality in low light
Ans: I think you know that it is quite a challenge for a tiny sensor but you also want 60 FPS. In general all your requirements can be met if you shoot in bright light. Indoors depends on the noise reduction implemented by the software and if it let's you have control or options to choose what kind of noise reduction or disabling it. Bear in mind the more noise reduction image sharpness suffers and noise artifacts appear. Best is to import to video editing software where it has better noise image processing than let phone do everything. Yes more work for you.
(5) Physical dimension about 16.5cm x 8cm x 1cm max (i need to fit it on a rig, so the measurements limit)
Ans: most 6 inch phones are of this size.
(6) Price is the last consideration, if the above specifications are met i may consider paying.
Ans: Amazon.sg selling oppo find 5 pro for S $1250, only 1 left in stock. ( At time of this post. )
Ans: I think it is priced competitively.
The pros and cons when it comes to recording video on phones.
Smartphone manufacturers have generally settled on having 30 or 60 fps available for video recordings, but some are pushing the boundaries, offering 120 or even 240 fps. Are they viable or just a marketing trick to make us buy more expensive and advanced, but not necessarily more useful...
www.digitalcitizen.life
Your target phone, is it available now?
The Oppo Find X5 Pro has plenty to prove if it wants to make people part with their money and we think it might have what it takes to get our Editor's Choice stamp of approval.
www.hardwarezone.com.sg
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Why you should avoid using f18 to F40 but this applies to larger sensors?
Sometimes a deep depth of field is desired for your images, but what disadvantage does shooting at f/22 and smaller apertures come with? Read and find out!
digital-photography-school.com