Monthly Archives: September 2017

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.

Continue reading

Advertisements

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)