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02/16/2006 06:43:29 PM · #1 |
| I was shooting a college basketball game and I was using my SB25 Nikon flash. When I checked the pics I was getting a ghost type blur on most of the shots. What causes this and how do I keep it from happening again? Not very good when it comes to flash photog. Still trying to build that skill. |
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02/16/2006 06:44:12 PM · #2 |
| Can you link an example? I'm not exactly sure what you mean... |
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02/16/2006 06:45:59 PM · #3 |
| Yeah let me try. I haven't posted a pic in a while. |
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02/16/2006 07:03:22 PM · #4 |
sounds like the shutter speed was too slow, called dragging the shutter. The flash wil freeze the motion, but if the shutter speed is too slow (as it mght be in aperture priority mode) then the ambient light will show the subject in motion.
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02/16/2006 08:47:28 PM · #5 |
| Prof fate I was thinking the same but, when I shut the flash off the photo is fine just a tad under exposed. With the flash on it is bright sharp but haslike an echo picture to it or ghost effect if you will. |
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02/16/2006 09:02:29 PM · #6 |
so if i shoot sports i tend to use shutter priority and set it to at least 1/250. what mode are you shooting?
jude
www.judewolpert.com
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02/16/2006 09:05:32 PM · #7 |
This is what I was thinking but he was in manual mode...what was the shutter speed on the pic? Aperture priority (at least on Canon) will expose the subject to the background without affecting the required shutter speed. In manual mode, it'll expose the subject to whatever shutter speed you've set it to. So, to prevent this blur, you'd want to crank your shutter speed up and let the flash compensate for the less light.
Just read what you said about it being fine without the flash just underexposed. So at the same settings without flash you don't have any 'haloing?'
Something I just noticed in the EXIF info of this picture...it says strobe return light detected in the flash section. Is your flash set up for strobing by any chance? In that case, you may be flashing twice during your exposure which would explain the 'halo' since he may have moved inbetween flashes.
In any case, I took the liberty of hosting your image on imageshack.
//img118.imageshack.us/img118/9218/dsc0142web9ue.jpg
Message edited by author 2006-02-16 21:11:50. |
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02/16/2006 09:25:19 PM · #8 |
Ok, I just found a utility to read the exif info better. The shutter speed was only 1/30s. That's definitely not fast enough for 200mm(x1.6 crop) = 300mm focal length. My bet is it is the shutter drag where the flash illuminates but the subject moves (realistically, the lens moves) while the shutter is still open. I don't know how it could look ok without the flash except that maybe it was just a blur everywhere.
In case anyone else wants to check it out:
Equipment Make: NIKON CORPORATION
Camera Model: NIKON D70
Camera Software: Adobe Photoshop CS2 Macintosh
Maximum Lens Aperture: f/2.8
Sensing Method: One-Chip Color Area
Color Filter Array Pattern: 958
Focal Length (35mm Equiv): 300 mm
Image-Specific Properties:
Image Orientation: Top, Left-Hand
Horizontal Resolution: 300 dpi
Vertical Resolution: 300 dpi
Image Created: 2006:02:16 21:17:22
White Point Chromaticity: 0.3
Exposure Time: 1/30 sec
F-Number: f/2.8
Exposure Program: Manual
Exposure Bias: 0 EV
Metering Mode: Pattern
Light Source: Fine Weather
Flash: Flash, Auto, Return Detected
Focal Length: 200.00 mm
Comment: (c) N. Todd Morris2005
Color Space Information: Uncalibrated
Image Width: 3008
Image Height: 2000
Rendering: Normal
Exposure Mode: Manual
White Balance: Manual
Scene Capture Type: Standard
Gain Control: None
Contrast: Normal
Saturation: Normal
Sharpness: Normal
Subject Distance Range: Unknown
Message edited by author 2006-02-16 21:26:20. |
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