Question 1

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

Accepted Answer

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.

Question 2

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

Accepted Answer

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.

Question 3

Does it have overheating issue?

Accepted Answer

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.

Question 4

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

Accepted Answer

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!

ASIN	B00ZDWGFR2
Amazon 売れ筋ランキング	家電＆カメラ - 656,401位 ( 家電＆カメラの売れ筋ランキングを見る ) ミラーレス一眼 - 817位コンパクトデジタルカメラ - 2,679位
GTIN (Global Trade Identification Number)	00027242893832
JPEG品質レベル	微細
UPC	027242893832
USB2.0ポート数	1
USB3.0ポート数	1
USBポート数	1
おすすめ度	4.6 5つ星のうち4.6 (460) var
お客様の年齢層	大人
アスペクト比	3:2
イメージキャプチャーの種類	ビデオ
オートフォーカス	はい
カメラレンズの説明	レンズなし
カラー	ブラック
カラースクリーン機能付き	いいえ
クロップモード	フルフレーム
コンポーネントアプトプット数	1
シャッタースピード	30 秒
ショット間の遅延	0.2 秒
セルフタイマー	10
ディスプレイ最大解像度	42.4 MP
デジタルスチル	いいえ
デジタルズーム	4
ハードウェアインタフェース	USB
バッテリー付属の有無	はい
ビデオ出力	HDMI
ビューの実質角度	58.1 度
ファイル形式	JPEG, Raw
ファインダー倍率	0.78x
ファインダー視野率	100
フォーカスモード	コンティニュアスサーボAF（AF-C）
フォームファクター	ミラーレス
フラッシュ同調速度	1/250 Second
ブランド名	Sony
ホワイトバランス設定	オート
メーカー名	Sony
メーカー型番	ILCE7RM2/B
モデルシリーズ	a7R II
リモコン付属	いいえ
レンズの最短焦点距離	10 ミリメートル
レンズの最長焦点距離	50 ミリメートル
レンズ種類（レンズキットの場合）	ズーム
世代	第2世代
互換デバイス	スマートフォン、コンピュータ。
互換性のあるマウント	ソニーミラーレス。
光学ズーム倍率	40 X
写真センサーテクノロジー	CMOS
写真センサー解像度	42.4 MP
動画モード搭載	はい
品目の寸法（D x W x H）	6奥行き x 12.7幅 x 9.6高さ cm
商品の重量	625 グラム
型番	ILCE7RM2/B
手振れ補正	センサーシフト式
技術レベル	初級者
撮像素子	フルフレーム（35mm）
撮影機能	ムービー
暗視機能付き	いいえ
書き込み速度	5 fps
最低拡張ISO	50
最大画像サイズ	8 MP
最大絞り値（F）	2.8 f
測距点	コントラスト検出, 位相差検出
無線タイプ	Wi-Fi
焦点の説明	自動、連続サーボAF、ダイレクトマニュアルフォーカス、マニュアルフォーカス、シングルサーボAF。
特殊な用途	写真撮影
特殊機能	顔認識機能
画面あたりのドット数	1,228,800 Dot
画面サイズの単位	3 インチ
総静止画解像度	42.4 MP
連写速度	5
開口モード	F2.8-F16
防水タイプか否か	非防水
静止画の有効解像度	42.4 MP

Sony a7R II Full-Frame Mirrorless Interchangeable Lens Camera, Body Only (Black) (ILCE7RM2/B)

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