PhotoMe's good for extensive investigation, but with online images it's more convenient to be able to to right-click and check the main Exif data immediately. In Firefox, I use
Exif Viewer.
Here what I see when I right-clicked on Ron's first swimming shot #1 (Sharon van Rouwendaal):
https://dl.dropbox.com/u/20195454/_S5W0028.jpg
IPTC
Coded Character Set = 27, 37, 71
Record Version = 4
Keywords = 50meter / Londen2012 / Rouwendaal / Tongelreep / eindhoven / kwalificatie / zwemmen
Date Created = 2011/12/02
Time Created = 09:19:39:
Digital Creation Date = 2011/12/02
Digital Creation Time = 09:19:39:
By-line = RonHendriks1966
Copyright Notice = Dela Trophy
IPTC Core (Adobe XMP)
Expand All / Collapse All / Show/Hide XMP Source / Show/Hide XMP Legend
xpacket = begin="" id="W5M0MpCehiHzreSzNTczkc9d"
x:xmpmeta
EXIF IFD0
Camera Make = PENTAX
Camera Model = PENTAX K-5
X-Resolution = 96/1 ===> 96
Y-Resolution = 96/1 ===> 96
X/Y-Resolution Unit = inch (2)
Software / Firmware Version = Adobe Photoshop Lightroom 3.5 (Windows)
Last Modified Date/Time = 2011:12:02 23:54:52
Artist = RonHendriks1966
Copyright Owner = Dela Trophy
EXIF Sub IFD
Exposure Time (1 / Shutter Speed) = 1/640 second ===> 0.00156 second
Lens F-Number / F-Stop = 4/1 ===> ƒ/4
Exposure Program = n/a (0)
ISO Speed Ratings = 3200
EXIF Version = 0230
Original Date/Time = 2011:12:02 09:19:39
Digitization Date/Time = 2011:12:02 09:19:39
Shutter Speed Value (APEX) = 9321928/1000000
Shutter Speed (Exposure Time) = 1/640 second
Aperture Value (APEX) = 4/1
Aperture = ƒ/4
Exposure Bias (EV) = 0/10 ===> 0
Metering Mode = center weighted average (2)
Flash = Flash did not fire, compulsory flash mode
Focal Length = 30000/100 mm ===> 300 mm
Image Sensing Method = one-chip color area sensor (2)
Image Source = digital still camera (DSC)
Scene Type = directly photographed image
Custom Rendered = normal process (0)
Exposure Mode = auto exposure (0)
White Balance = manual (1)
Focal Length in 35mm Film = 450
Scene Capture Type = standard (0)
Contrast = normal (0)
Saturation = normal (0)
Sharpness = hard (2)
Subject Distance Range = distant view (3)
Unknown tag, Tagnum 0xa432 = data ===> 3000/10,3000/10,40/10,40/10
Unknown tag, Tagnum 0xa434 = data ===> smc PENTAX-DA* 300mm F4 ED [IF] SDM
BTW, you can use the embedded APEX shutter speed & apertures values in conjunction with the stops difference in ISO to work out the LV without using a LV calculator. Using the coloured data above:
Aperture Value (APEX) = 4/1 =
Av 4 Shutter Speed Value (APEX) = 9321928/1000000=
Tv 9.3
Ev = Av + Tv
Ev is ISO100 referenced, whereas LV considers the effect of different ISOs. To adjust for a different ISO, subtract the difference in stops from ISO100. (If a sensitivity less than ISO100 is used,
add the difference e.g. with ISO80 add 0.3 stops.)
ISO Speed Ratings = 3200 = 5 stops above ISO100
ISO100-> ISO200 (1 stop) -> ISO400 (2 stops) -> ISO800 (3 stops) -> ISO1600 (4 stops) ->ISO 3200 (5 stops)
LV = Av + Tv - ISOdiff
=
Av 4 +
Tv 9.3 -
5 stops
=
LV 8.3
Which is a very low light level for action, which is why Ron used such a high ISO, dropped the shutter speed to 1/640s and shot wide open at f/4.
See the last two posts here for more info on APEX & LV from Exif:
https://www.pentaxforums.com/forums/photography-articles/126203-stops-shutter...nsitivity.html
Dan.