Category Archives: Camera and Lens

Understanding AF Detection at f/8 on DSLR Cameras

Misunderstanding 1: The inability to focus at small apertures is nothing to do with amount of light. You still have a lot of light with f/8 in sunny day, much more than at f/2.8 indoors. It is actually related to Phase Detection AF mechanism which operates much like range finder comparing images from different angles to determine it’s in-focus or not. Small lens aperture just blocks light paths from different angles, and as the result, makes AF sensor unable to work reliably or not at all.

Misunderstanding 2: Older Nikon cameras may not auto-focus reliably with a lens having a maximum aperture smaller than f/5.6. That may sound bad, if you assume that it means the camera will not auto-focus reliably when the aperture is closed down to f/5.6. That is not what Nikon is saying! Instead they are telling us that auto-focus may not work reliably on older Nikon cameras with a lens having a maximum aperture of f/5.6, with the emphasis on the word maximum.

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D750 vs D810 vs D5 vs D850 vs 5D mark IV

 

Parameter D750 D810 D5 D850 5D Mark IV
Introduce Year 2014/09 2014/06 2016/01 2017/09 2016/08
Sensor Resolution 24.3 MP 36.3 MP 20.8 MP 45.7 MP 30.4 MP
Sensor Type CMOS CMOS CMOS BSI CMOS CMOS
ISO Score by DxOmark 2956 2853 2434 ???? 2993
Low Pass Filter Yes No   No Yes
Image Processor EXPEED 4 EXPEED 4 EXPEED 5 EXPEED 5 DIGIC 6+
Buffer size (RAW 14 bit) 15 28 200 51 21
Storage Media 2x SD 1x CF, 1x SD 2x XQD or 2x CF 1x QXD, 1x SD (UHS-II) 1x CF, 1x SD (UHS-I)
Continuous Shooting Speed 6.5 FPS 5 FPS 12 FPS 7.0 fps 7.0 fps
Exposure Metering Sensor 91,000-pixel RGB sensor 3D Color Matrix Metering III 91,000-pixel RGB sensor 3D Color Matrix Metering III 180,000-pixel RGB sensor 3D Color Matrix Metering III 181,000-pixel RGB sensor 150,000-pixel RGB+IR metering sensor
Autofocus System Advanced Multi-CAM 3500FX II Advanced Multi-CAM 3500FX   Multi-CAM 20K  
Dedicate AF Engine No No Yes Yes  
Number of AF Points 51 AF points, 15 cross-type 51 AF points, 15 cross-type 153 AF points, 99 cross-type 153 AF points, 99 cross-type 61 AF points, 41 cross-type
Detection Range -3 to +19 EV -2 to +19 EV -4 to +20 EV -4 to +20 EV -3 to +18 EV
AF Detection Up to f/8 (11 AF points) Up to f/8 (11 AF points)   Up to f/8, 15 sensors  
LCD Size and Type 3.2″ TFT-LCD Tilting 3.2″ TFT-LCD 3.2″ Touchscreen TFT-LCD 3.2″ Tilting + Touchscreen LCD 3.2″ Touchscreen LCD
Dual Pixel AF       No Yes
Dual Pixel RAW       No Yes
Built-in GPS No No No No Yes
Battery EN-EL15 EN-EL15 EN-EL18a EN-EL15a  
Battery Life 1,230 shots (CIPA) 1200 shots (CIPA) 3,780 shots (CIPA) 1840 shots (CIPA) 900 shots (CIPA)
Battery Charger MH-25a Quick Charger MH-25a Quick Charger   MH-25a Quick Charger  
USB Version 3 3 3 3 3
Weight (Body Only) 26.5 oz. (750g) 31.1 oz. (880g) 1,405g (With Battery + 2x XQD) 915g 800g
MSRP Price $2,299 (as introduced) $3,299 (as introduced) $6,499 $3,299 (as introduced) $3,499 (as introduced)

 

Nikon D850 vs Canon 5D Mark IV Specification Comparison

 

Camera Feature Nikon D850 Canon 5D Mark IV Comparison Notes
Sensor Resolution 45.7 MP 30.4 MP More pixel for wildlife & landscape photography  
Sensor Type BSI CMOS CMOS Better ISO (35xx vs 2993 DxO Score) Not yet known the ISO score but Sony BSI CMOS is well-known for low light (as of A7Rii)
Low-Pass Filter No Yes No AA filter brings more sharpness, but may result in moiré issue in bird photography Some claims that moiré issue is not significant
Buffer: RAW 14-bit Lossless Compressed 51 21    
Storage Media 1x QXD, 1x SD (UHS-II) 1x CF, 1x SD (UHS-I)    
Continuous Shooting Speed 7.0 fps, 9.0 fps with MB-D18 7.0 fps    
Number of AF Points 153 AF points, 99 cross-type 61 AF points, 41 cross-type   Some point out that 5D mark IV actually has more working cross AF points at aperture F/8
AF Detection Range -4 to +20 EV -3 to +18 EV -4 mean better  focus in low light  
Auto AF Fine-Tune Yes No    
Focus Peaking Yes No    
Focus Stacking Yes No    
Video Maximum Resolution 3,840 x 2,160 (4K) @ up to 30 fps 4,096 x 2,160 (4K) @ up to 30 fps    
Video Crop Factor 1.0x 1.74x    
LCD Size and Type 3.2″ Tilting Touchscreen LCD 3.2″ Touchscreen LCD Tilt LCD gives more flexible to shoot from different angles Less practical if AF is not good in live view
Dual Pixel AF No Yes Much better focus ability with Live View and for Video Nikon has contrast AF only when using live view, which is very slow.
Dual Pixel RAW No Yes    
LCD Resolution 2,359,000 dots 1,620,000 dots    
Built-in GPS No Yes GPS-enabled is good for wildlife photography  
Bluetooth Yes No    
Battery Life 1840 shots (CIPA) 900 shots (CIPA) Longer is better, but 900 is good enough.  
Button Illumination Yes No    
Weight (Body Only) 915g 800g    
Dimensions 146.0 x 124.0 x 78.5mm 150.7 x 116.4 x 75.9mm    
MSRP Price $3,299 (as introduced) $3,499 (as introduced) Canon 5D4: 65tr

Nikon D850: ??

(Table content: courtesy photographylife.com)

 

 

 

Sony RX100 Series Comparison (I, II, III, IV and V)

Articles from: https://photographylife.com/sony-rx100-series-comparison

Specification Sony RX100 I Sony RX100 II Sony RX100 III Sony RX100 IV Sony RX100 V
As expected, the latest generation Sony RX100 V obviously does have much richer feature-set and specifications compared to its predecessors. It has a superior Stacked CMOS sensor with excellent image quality that surpasses all the previous generation RX100 cameras, faster Bionz X processor with a front-end LSI capable of handling up to 24 fps shooting speed, 315 phase-detection autofocus points, 4K video recording at up to 30 fps and very respectable slow motion video recording capability up to 960 fps. It can handle shutter speeds of up to 1/32000 sec, has a very nice 2.36M electronic viewfinder (EVF), incredibly fast autofocus and a few other nice extras, such as anti distortion shutter and ability to set minimum shutter speed when shooting with Auto ISO enabled.
Announcement Date 06/06/2012 06/27/2013 05/28/2014 06/10/2015 10/06/2016
Sensor Type CMOS BSI CMOS BSI CMOS Stacked CMOS Stacked CMOS
Sensor Resolution 20.2 MP 20.2 MP 20.1 MP 20.1 MP 20.1 MP
Sensor Size 13.2 x 8.8mm (1″) 13.2 x 8.8mm (1″) 13.2 x 8.8mm (1″) 13.2 x 8.8mm (1″) 13.2 x 8.8mm (1″)
Native ISO Range 125-6400 160-12,800 125-12,800 125-12,800 125-12,800
Image Processor Bionz Bionz Bionz X Bionz X Bionz X
Phase Detection Autofocus No No No No Yes
Phase Detection Autofocus Points N/A N/A N/A N/A 315 AF Points
Lens Focal Length 10.4-37.1mm 10.4-37.1mm 8.8-25.7mm 8.8-25.7mm 8.8-25.7mm
Focal Length in 35mm Equiv 28-100mm 28-100mm 24-70mm 24-70mm 24-70mm
Lens Aperture f/1.8-f/4.9 f/1.8-f/4.9 f/1.8-f/2.8 f/1.8-f/2.8 f/1.8-f/2.8
Integrated ND Filter No No Yes Yes Yes
Maximum Shutter Speed 1/2000 sec 1/2000 sec 1/2000 sec 1/32000 sec 1/32000 sec
Startup Time 2.8 sec 2.8 sec 2.0 sec 2.0 sec 2.0 sec
Anti Distortion Shutter No No No Yes Yes
Auto ISO Min Shutter Speed No No No Yes Yes
EVF N/A Optional 1.44 Million Dot EVF 2.36 Million Dot EVF 2.36 Million Dot EVF
Flash Hotshoe No Yes No No No
Built-in Flash Yes Yes Yes Yes Yes
Continuous Shooting Speed 10 fps 10 fps 10 fps 16 fps 24 fps
Buffer Size 13 JPEG / 13 RAW 13 JPEG / 13 RAW 48 JPEG / 26 RAW 48 JPEG / 26 RAW 150 JPEG + RAW
LCD Screen 3.0″ Fixed 3.0″ Tilting, +90°/-40° 3.0″ Tilting, +180°/-45° 3.0″ Tilting, +180°/-45° 3.0″ Tilting, +180°/-45°
Video Recording 1080p, up to 50 fps 1080p, up to 60 fps 1080p, up to 60 fps 4K, up to 30 fps 4K, up to 30 fps
S-Log2/S-Gamut No No No No Yes
Slow Motion Video N/A N/A Yes, Up to 120 fps Yes, Up to 960 fps Yes, Up to 960 fps
Slow Motion Video Duration N/A N/A 29 min 4 sec 8 sec
Built-in WiFi No Yes Yes Yes Yes
Battery Life (CIPA) 330 shots 350 shots 320 shots 280 shots 220 shots
Weight 240g 281g 290g 298g 299g
Size 102×58×36mm 102×58×38mm 102×58×41mm 102x58x41mm 102x58x41mm
Current Price (as of 10/06/2016) $448 $598 $748 $998 $998

How Canon EF lenses auto-focus on A7ii/A7Rii with adapters

Test result database here: https://docs.google.com/spreadsheets/d/1WdE3DveA2Iz80P-Ta1WWAPhZy9gNSTzAG1i2l3o7SaM/edit?pli=1#gid=1799972419&vpid=A2

Test form for people input their test results here: https://docs.google.com/forms/d/1klEN5jHZd1MS-4mjOUev7Ahyuoo3vSRNOqlCzxGmMrI/viewform

Discussion: http://www.dpreview.com/forums/thread/3935272

Adapter which allow AF for Canon lenses on A7ii/A7Rii:

  • Metabones T Smart Adapter IV ($400)
  • Sigma MC-11 ($250)
  • FotodioX AF Adapter for Canon EF to Sony E-Mount ($100)
  • Viltrox Auto-focus Canon EF/EF-S Lens to Sony E Mount Adapter II ($100)
  • Commlite EF-NEX ($100)
  • Techart EOS-NEX III ($190)     [unstable]
  • No Brand EF-NEX ($50) (apperance similar to Commlite adapter)

Guide to Sony A7ii, A7Rii, A7Sii lens adapters (2014): http://briansmith.com/sony-a7-a7r-lens-mount-adapters/

 

Git 2 Gitup Action Camera Review

git2-front-back1-1360x600

Some of the exciting features of GIT2 are 16 megapixels IMX206 Sony Exmor image sensor and Novatek NTK96660 chip. Combination of the two allow camera to create true 16mp images in RAW or Jpeg, and more importantly video at 1080p 60 FPS together with 2K @30FPS and 2880×2160 @24fps. Camera supports external microphone and memory card up to 64gb.

Like previous model, this one is compatible with wrist controller which allows remote control of the camera via radio frequency. Additionally camera has a built in WiFi, so you can connect to it via your smartphone. It got 30-meter water-proof housing (like GoPro Hero). Its retail price is around 159$, though some Chinese retailers sell it for a bit less.

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