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05-11-2013, 07:55 AM   #16
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For some similar lenses, the 17-50 Tamron for example, you'd have to stop down pretty far - maybe even beyond f8 - to get everything in a flat subject sharp at 18mm and relatively close focusing distances. Not sure if your lens has a similar focus field curvature characteristic.

Paul

05-11-2013, 08:04 AM   #17
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Location: Matoaca, Va
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Here is a shot with my K-r and 2 pictures

Exposure time, sec: 1/160
Aperture (F): 4.50
ISO speed rating: 100
Lens focal length, mm: 18.0
Orientation: Normal
Copyright: JOHN_LEWIS_DESIGNS
File change date and time: 2013:04:07 14:46:28
Flash: Flash did not fire, compulsory flash mode
Exposure bias (APEX): 0/10
Metering mode: multi-segment
Exposure mode: Manual exposure
White balance: Auto white balance
Focal length in 35 mm film, mm: 27
Scene capture type: Standard
Contrast: Normal
Saturation: Normal
Sharpness: Normal
Subject distance range: ExifA40AValue2
Artist: JOHN_LEWIS_DESIGNS
Sensing method: One-chip color area sensor
X Resolution: 300/1
Y Resolution: 300/1
Units: 2
SoftWare: K-r Ver 1.00
YCbCrPositioning: Co-sited
Exif version: 0221
ComponentsConfiguration: YCbCr
Colorspace: 1
PixelXDimension: 2848
PixelYDimension: 4288
FlashPix Version: 0100
Compression: 6
InteroperabilityVersion: 0100
Attached Images
   
05-11-2013, 09:37 AM   #18
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Location: Lake Superior - Michigan
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QuoteOriginally posted by johnlewis804 Quote
well i already did a shoot and had my iso at 400 and shutter speed at 1/180 and her heels were still kinda blurry, So im going to keep the iso at 400 and change the speed to 1/90 or below and see if that helps
Do you know how to stop down your lens to your working aperture to preview your depth of field? On a K-r, the best way is to re-program your green button for optical preview. Then try manual focusing rather than auto-focus to align your subject within the DOF.

If your aperture is at f/11 or higher and you still can't fit your subject within the DOF, it's time for plan B - move back and use a longer focal length.
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