D90 + 50mm f1.8 FOCUS PROBLEMS

AlanD90

AlanD90

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Name
Alan
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Hey everyone, been wondering about this for a while so just thought I would start a thread on this as I seen another on a similar problem.
I do wedding photography and sometimes use my 50mm as the Bride and Bridesmaids walk down the aisle.
However I noticed with using this lens and hopped someone could help, as the bride walks down the aisle and I continuously take photos of her walking down alot of my pictures are back focused, the background is perfectly clear yet the people aren't, I know that it isn't my fault as I'm using single point autofocus and it's placed directly on her face at about f2.8 yet it seems to focus on the background :'(
Yet when I have a still subject the lens is perfect.
I maybe get the odd shot in focus but most aren't. Those that are in focus are normally the closer photos as they get within a few meters of me.
Anyone have any ideas?
 
Are you using AFC or AFS? Moving subjects will require AFC but it may be worth using back button focussing for the best of both worlds.
 
I was using AF-C, it was nearly like the d90 foucsed once every few meters rather than constant, but that doesnt explain the background being in focus most of the time. Shall try the back button trick though and see how I find it.
 
photostream
 
Last edited:
<a href="http://www.flickr.com/photos/alan-mcd/6286466094/" title="D90+50mm 1.8 focus problem by Vampire-Knight, on Flickr"><img src="http://farm7.static.flickr.com/6041/6286466094_5407e40880.jpg" width="332" height="500" alt="D90+50mm 1.8 focus problem"></a>
 
You need to use the "Grab the HTML/BBCode" one and then paste it directly into the reply box without using the insert image button
 
<a href="http://www.flickr.com/photos/alan-mcd/6286466094/" title="D90+50mm 1.8 focus problem by Vampire-Knight, on Flickr"><img src="http://farm7.static.flickr.com/6041/6286466094_5407e40880.jpg" width="332" height="500" alt="D90+50mm 1.8 focus problem"></a>
 
Exif info here:

Exif data

Camera Nikon D90
Exposure 0.017 sec (1/60)
Aperture f/2.0
Focal Length 50 mm
Focal Length 50.4 mm
ISO Speed 400
Exposure Bias 0 EV
Flash No Flash
X-Resolution 300 dpi
Y-Resolution 300 dpi
Orientation Horizontal (normal)
Software Microsoft Windows Photo Viewer 6.1.7600.16385
Date and Time (Modified) 2011:09:11 15:12:51
White Point 0.313 0.329
Primary Chromaticities 0.64 0.33 0.21 0.71 0.15 0.06
YCb Cr Coefficients 0.299 0.587 0.114
YCbCr Positioning Co-sited
Padding (Binary data 2060 bytes, use -b option to extract)
Exposure Program Manual
Date and Time (Original) 2011:09:09 12:01:42
Date and Time (Digitized) 2011:09:09 12:01:42
Compressed Bits Per Pixel 4
Max Aperture Value 1.7
Metering Mode Spot
Light Source Unknown
Sub Sec Time 00
Sub Sec Time Original 00
Sub Sec Time Digitized 00
Color Space Uncalibrated
Sensing Method One-chip color area
CFAPattern [Green,Blue][Red,Green]
Custom Rendered Normal
Exposure Mode Manual
White Balance Auto
Digital Zoom Ratio 1
Focal Length In35mm Format 75 mm
Scene Capture Type Standard
Gain Control Low gain up
Contrast Normal
Saturation Normal
Sharpness Normal
Subject Distance Range Unknown
Gamma 2.2
Padding (Binary data 2060 bytes, use -b option to extract)
Offset Schema 4114
Maker Note Version 2.10
ISO 400
Quality Fine
White Balance Auto
Focus Mode AF-C
Flash Setting Normal
White Balance Fine Tune 0 0
WB_ RBLevels 1.1875 1.7734375 1 1
Program Shift 0
Exposure Difference +1.4
Flash Exposure Comp 0
ISOSetting 400
Image Boundary 0 0 4288 2848
Flash Exposure Bracket Value 0.0
Exposure Bracket Value 0
Crop Hi Speed Off (4352x2868 cropped to 4352x2868 at pixel 0,0)
Exposure Tuning 0
Serial Number 2288962
Color Space Adobe RGB
VRInfo Version 0100
Vibration Reduction Off
Active D- Lighting Low
Picture Control Version 0100
Picture Control Name Vivid
Picture Control Base Vivid
Picture Control Adjust Default Settings
Picture Control Quick Adjust Normal
Sharpness 4
Contrast Normal
Brightness Normal
Saturation Normal
Hue Adjustment None
Filter Effect n/a
Toning Effect n/a
Toning Saturation n/a
Timezone +00:00
Daylight Savings No
Date Display Format D/M/Y
ISOExpansion Off
ISO2 400
ISOExpansion2 Off
Lens Type D
Lens 50mm f/1.8
Flash Mode Did Not Fire
Shooting Mode Continuous
Lens FStops 7.33
Shot Info Version 0213
Firmware Version 1.00
Shutter Count 9784
Noise Reduction Off
WB_ RGGBLevels 2848 0 0 0
Lens Data Version 0204
Exit Pupil Position 55.4 mm
AFAperture 1.7
Focus Position 0xa1
Focus Distance 14.96 m
Lens IDNumber 118
Min Focal Length 50.4 mm
Max Focal Length 50.4 mm
Max Aperture At Min Focal 1.8
Max Aperture At Max Focal 1.8
MCUVersion 122
Effective Max Aperture 1.8
Retouch History None
Image Data Size 4880556
Flash Info Version 0103
Flash Source None
External Flash Firmware n/a
External Flash Flags (none)
Flash Commander Mode Off
Flash Control Mode Off
Flash GNDistance 0
Flash Color Filter None
Flash Group AControl Mode Off
Flash Group BControl Mode Off
Flash Group CControl Mode Off
Flash Group AExposure Comp 0
Flash Group BExposure Comp 0
Flash Group CExposure Comp 0
Multi Exposure Version 0100
Multi Exposure Mode Off
Multi Exposure Shots 0
Multi Exposure Auto Gain Off
High ISONoise Reduction Off
Power Up Time 2011:09:09 11:59:52
AFInfo2 Version 0100
Contrast Detect AF Off
AFArea Mode Single Area
Phase Detect AF On (11-point)
Primary AFPoint Mid-right
AFPoints Used Mid-right
Contrast Detect AFIn Focus No
File Info Version 0100
Directory Number 100
File Number 0073
Compression JPEG (old-style)
XResolution 300
YResolution 300
Resolution Unit inches
Preview Image Start 14480
Preview Image Length 26770
YCb Cr Positioning Co-sited
Light Switch LCD Backlight
AFArea Mode Setting Single Area
Center Focus Point Normal Zone
AFAssist On
AFPoint Illumination On
Focus Point Wrap No Wrap
AELock For MB- D80 AE/AF Lock
MB- D80 Battery Type LR6 (AA alkaline)
Beep On
Grid Display On
ISODisplay Show ISO Sensitivity
Viewfinder Warning On
No Memory Card Release Locked
Screen Tips On
File Number Sequence Off
Shooting Info Display Auto
LCDIllumination Off
Easy Exposure Comp Off
Reverse Indicators + 0 -
Exposure Control Step Size 1/3 EV
Center Weighted Area Size 8 mm
Fine Tune Opt Matrix Metering 0
Fine Tune Opt Center Weighted 0
Fine Tune Opt Spot Metering 0
CLMode Shooting Speed 4 fps
Exposure Delay Mode Off
Auto Bracket Set AE & Flash
Auto Bracket Order -,0,+
Func Button + NEF (RAW)
OKButton Select Center Focus Point
AELock Button AE Lock (hold)
Command Dials Reverse Rotation No
Shutter Release Button AE- L Off
Metering Time 8 s
Remote On Duration 1 min
Self Timer Time 2 s
Self Timer Shot Count 1
Playback Monitor Off Time 10 s
Image Review Time 10 s
Menu Monitor Off Time 20 s
Shooting Info Monitor Off Time 10 s
Flash Shutter Speed 1/60 s
Internal Flash Manual
Manual Flash Output 1/4
Repeating Flash Output 1/32
Repeating Flash Count 10
Repeating Flash Rate 10 Hz
Flash Warning On
Commander Internal TTLComp 0
Modeling Flash On
Auto FP Off
Commander Group A_ TTLComp 0
Commander Group B_ TTLComp 0
Live View AF Wide Area
Compression JPEG (old-style)
About uuid:faf5bdd5-ba3d-11da-ad31-d33d75182f1b
Creator Tool Microsoft Windows Photo Viewer 6.1.7600.16385
 
Waow that is one list lol! Also thanks guys for showing me how to post a picture! Never had a need for it before so was a bit awkward to say the least! Hopefully someone will be able to help me with the lens :)!
 
AlanD90 said:
Waow that is one list lol! Also thanks guys for showing me how to post a picture! Never had a need for it before so was a bit awkward to say the least! Hopefully someone will be able to help me with the lens :)!
Click to expand...

I can't see anything obviously suspect on the Exif. Shutter speed is lowish I suppose but nothing out the ordinary. Maybe worth doing some scientific testing on some static subjects to check focus on that lens.
 
It's almost like the subject has to be a certain size in the viewfinder for it to focus easier? Or maybe it's because the light comming threw the doors behind them threw the camera off a bit?
 
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