Is this the best lens to use with the a7R for low light situations? http://amzn.to/2lExqnH

You didn't mention what sort of photography you wanted to use it for, so, in general terms a 50mm is a good starting point for general photography. IF you are planning on doing a lot of general low light shooting then save up your money and get a faster 50mm f1.4 lens which let's in approximately twice as much light. There are even faster lenses but are much more money or not as good optically. If you buy a 50mm lens, and want to stick with prime lenses, meaning no zoom lenses, then for future lens choices consider looking at lenses with focal length that are half or double your 50mm. In other words something like a 24mm wide angle and 100mm Telephoto lens. The 24mm would be good for taking photos of landscapes, architecture, or groups of people. The 100mm, or 105mm, would be good for portraits. Again, this is speaking in general terms and what was considered the rule of thumb prior to the 70's and the introduction of affordable zooms with good optics. Nowadays zoom lenses seem to be the norm with people starting out with a camera that came with a inexpensive "kit" lens or two. Some if those can be a good deal for beginners but they sacrifice light gathering ability for versatility of zoom. Even the professional zoom lens costing a thousand dollar, often much more, are limited to a maximum aperture of f2.8, fast for a zoom, but slower than a prime, or fixed focal length lens. Your first step should be to stop and consider exactly what you want to photograph, now and in the future, next your budget, then look at what is available. If you're undecided which lens to go with consider renting a lens first. In fact if you're only going to need a particular lens once or twice, say for a vacation, then renting is an option to consider.

When will Sony offer an uncompressed RAW format, so as to adress the image quality problems resulting from its current compression algorithm?

EDIT: It's just been announced Sony will be offering 14bit on new cameras and updating a7rii. Original post:I wouldn't worry about it. I've never had a problem with Sony's lossy RAW and I'm a professional photographer. If you're shooting RAW then you're most likely using Lightroom which supposedly compensates for Sony's 11+7 compression algorithm anyway.

Does it have overheating issue?

The problem plagues mirrorless Sony cameras in particular. It is rare on Canon DSLR cameras but when it happens the camera turns off without any warning message. (T3i is a great model if you have a good enough lens, and is extremely fast at writing to even low-class memory cards, which is insane how the DIGIC processor seems really robust.) Overheating issues are not on Panasonic cameras such as GH4. You probably want that camera for 4K if Sony gives you this problem, and I think that if videography is more important over photography on a budget, you probably want the Sony RX10 II. It is a lot better than the RX100 IV (its JPEG images are not very good even at low ISO--the lens is smaller than the RX10 II, which does play a role on a larger sensor camera). Maybe if you do not want a small camera and better battery life on a budget with greater zoom, Panasonic FZ1000 is probably the best choice. It takes really good ISO 6400 shots and very clean 4K video (remember that it is really UHD) in good to dim lighting. I cannot seem to achieve good ISO 6400 shots on any Sony model I own and samples on professional websites. Panasonic may be cheaper and is just as good, if not better. Just do not expect weather resistant protection and headphone jack on those models. Hope this helps.

Why usb 2.0 and not usb 3.0, which is the fram rate and how long the battery with video?

The reason Sony went with usb 2.0 and not 3.0 is because only with 2.0 would the camera be able to both be charged via external battery/wall charger and used to photograph at the same time. That was one of my major gripes with the A6000 as i was not able to do long time-lapse movies because of the small battery. My A7r2 solved that problem!

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Description

📸 Elevate your vision — shoot like a pro, share like a trendsetter.

CINEMA QUALITY 4 K - Record stunning 4K videos with full pixel readout and zero pixel binning for flawless motion capture.
UNMATCHED CLARITY - Capture ultra-detailed 42.4MP images with the Exmor R CMOS full-frame sensor for professional-grade photos.
SEAMLESS CONNECTIVITY - Effortlessly transfer and control your shots via Wi-Fi and NFC, keeping you connected and creative on the go.
STEADY SHOTS EVERY TIME - Experience industry-first 5-axis in-body stabilization that eliminates blur, even in challenging conditions.
LIGHTNING FAST AUTOFOCUS - Lock focus instantly with 399 phase-detection points and hybrid AF for razor-sharp portraits and action shots.

The Sony ILCE-7RM2 is a powerhouse full-frame mirrorless camera featuring a 42.4MP Exmor R CMOS sensor, advanced 5-axis in-body stabilization, and 4K video recording with full pixel readout. Designed for professionals and enthusiasts alike, it offers fast hybrid autofocus with 399 phase-detection points, robust connectivity via Wi-Fi and NFC, and ergonomic durability for all shooting conditions.

Specifications

Metering Methods	Center-Weighted Average, Multi-Zone, Spot
Exposure Control	Aperture Priority, Auto, Manual, Program, Shutter Priority
White Balance Settings	Auto
Self Timer	10
Screen Size	3 Inches
Display Type	LCD
Dots Per Screen	1228800
Display Fixture Type	Tilting
Display Resolution Maximum	1,228,800 dots
Has Color Screen	No
Flash Memory Type	SDXC
Memory Slots Available	1
Write Speed	5 fps
Compatible Mountings	Sony Mirrorless
Sensor Type	CMOS
Image stabilization	Sensor-shift
Maximum Aperture	2.8 f
Expanded ISO Minimum	102400
Photo Sensor Resolution	42.4 MP
Photo Sensor Size	Full Frame (35mm)
Maximum Shutter Speed	30 Seconds
Minimum Shutter Speed	30 Seconds
Form Factor	SLR-style-mirrorless
Special Feature	Face Detection
Color	Black
Item Weight	625 Grams
Video Resolution	4K UHD 2160p
Viewfinder	Electronic
Flash Modes	Auto, Fill Flash, Hi-Speed Sync, Off, Rear Sync, Red-Eye Reduction, Slow Sync, Wireless
Camera Flash	Hotshoe
Skill Level	Professional
Compatible Devices	Smartphones, Computers
Continuous Shooting	5
Aperture modes	F2.8-F16
Viewfinder Magnification	0.78x
Audio Input	Microphone
Flash Sync Speed	1/250 Second
Video Capture Format	4K, HD
Expanded ISO Maximum	102400
Battery Weight	22 Grams
Audio Output Type	Headphones
Battery Cell Type	Lithium Ion
Battery Type	Lithium Ion
Aspect Ratio	3:2
File Format	JPEG, Raw
Effective Still Resolution	42.4 MP
JPEG Quality Level	Basic, Fine, Normal
Supported Image Format	JPEG
Maximum Image Size	8 MP
Bit Depth	14 Bit
Total Still Resolution	42.4 MP
Maximum Focal Length	50 Millimeters
Optical Zoom	40 x
Lens Type	body-only
Zoom	AF mode
Camera Lens	No Lens
Minimum Focal Length	10 Millimeters
Digital Zoom	4
Connectivity Technology	HDMI, NFC, USB
Wireless Technology	Wi-Fi
Video Output	HDMI
Total USB 2.0 Ports	1
Total USB 3.0 Ports	1
Total USB Ports	1
Total Video Out Ports	1
Shooting Modes	AUTO (Auto), Programmed AE (P), Aperture priority (A), Shutter-speed priority (S), Manual (M), Movie (Programmed AE (P) / Aperture priority (A) / Shutter-speed priority (S) / Manual (M))
Digital-Still	No
Movie Mode	Yes
Image Capture Type	Video
Night vision	No
Auto Focus Technology	Eye Detection
Focus Features	Hybrid
Autofocus Points	399
Focus Type	Auto Focus
Focus Mode	Continuous-Servo AF (AF-C), Direct Manual Focus (DMF), Manual Focus (MF), Single-Servo AF (AF-S)
Autofocus	Yes

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