Exif data in posted photos

[mrodgers]

I've been confused on something for quite some time. I look at exif data with Opanda for Firefox as I'm sure many others do as well. I notice there are quite a few different things listed in the exif that I thought would and should be the same. For example, I was looking at this exceptional photo in this thread....

http://www.thephotoforum.com/forum/showthread.php?t=121333

The exif is as follows....

Exposure time: 1/250"
F Number: F8
......
Shutter speed value: 7.97 TV
Aperture value: 6AV
Max Aperture value: F5.66



Now, could someone explain the differences in numbers here? Exposure time of 1/250, then listing the Shutter speed value of 7.97 TV. I would think that Exposure time and shutter speed would be the same number.

And the F Number of F8 I would assume should match the Aperture value (6AV). And what would "Max Aperture value" be?

This has been confusing me for some time now.

Thanks

 

[Josh66]

And what would "Max Aperture value" be?

That's probably the max aperture of the lens.

Not sure about the other stuff.

 

[Mav]

Some of these EXIF decoders are better than others, and it's entirely up to the programmer as to what they display and how it's displayed. The one I have for Firefox (Mac) says this.

Camera Make: NIKON CORPORATION
Camera Model: NIKON D300
Image Date: 2008:04:16 11:06:06
Flash Used: No
Focal Length: 100.0mm (35mm equivalent: 150mm)
Exposure Time: 0.0040 s (1/250)
Aperture: f/8.0
ISO equiv: 100
White Balance: Auto
Metering Mode: Center Weight
Exposure: program (Auto)

If I'm really curious though, I drag the file to my desktop, then drag it onto my EXIF Viewer app which gives me all this:

File name: zakim01.jpg
File size: 81360 bytes (623x420, 2.5bpp, 10x)
EXIF Summary: 1/250s f/8.0 ISO100 100mm (35mm eq:150mm)

Camera-Specific Properties:

Equipment Make: NIKON CORPORATION
Camera Model: NIKON D300
Camera Software: Adobe Photoshop CS2 Windows
Maximum Lens Aperture: f/5.7
Sensing Method: One-Chip Color Area
Color Filter Array Pattern: 762
Focal Length (35mm Equiv): 150 mm

Image-Specific Properties:

Image Orientation: Top, Left-Hand
Horizontal Resolution: 240 dpi
Vertical Resolution: 240 dpi
Image Created: 2008:04:30 22:50:49
Exposure Time: 1/250 sec
F-Number: f/8.0
Exposure Program: Normal Program
ISO Speed Rating: 100
Lens Aperture: f/8.0
Exposure Bias: 0 EV
Metering Mode: Center Weighted Average
Light Source: Unknown
Flash: No Flash
Focal Length: 100.00 mm
Color Space Information: sRGB
Image Width: 623
Image Height: 420
Rendering: Normal
Exposure Mode: Auto
White Balance: Auto
Scene Capture Type: Standard
Gain Control: None
Contrast: Normal
Saturation: Normal
Sharpness: Normal
Subject Distance Range: Unknown

Other Properties:

Resolution Unit: i
Exif IFD Pointer: 228
Compression Scheme: JPEG Compression (Thumbnail)
Horizontal Resolution: 72 dpi
Vertical Resolution: 72 dpi
Resolution Unit: i
Offset to JPEG SOI: 874
Bytes of JPEG Data: 5007
Exif Version: 2.21
Image Generated: 2008:04:16 11:06:06
Image Digitized: 2008:04:16 11:06:06
Shutter Speed: 1/250 sec
DateTime Second Fraction: 07
DateTimeOriginal Second Fraction: 07
DateTimeDigitized Second Fraction: 07
File Source: Digital Still Camera
Scene Type: Directly Photographed
Digital Zoom Ratio: 1

Max aperture of f/5.7 probably means the lens would be wide open at f/5.7 ?? (f/5.6) so they were down one stop at f/8. No idea on "7.97TV" and "6AV" though.

 

[RebelTasha]

Is there a way of looking at the Exif data without downloading the picture?
I use IE7.

 

[JustAnEngineer]

Is there a way of looking at the Exif data without downloading the picture?
I use IE7.

That's what the OP was telling us about.
http://www.opanda.com/en/iexif/index.html

 

[RebelTasha]

Very Cool.. Thank you

 

[Josh66]

I use an extension for firefox called Exif Viewer. You just right click on the image and select "view exif". (Not IE7...but they probably have something similar.)

 

[One Sister]

Ha ha. Sorry I didn't see this thread a few hours ago when I started one with questions about EXIF data as well.

I guess I'll post my questions here as no one answered me on the other thread. I've noticed that sometimes even my own posted images do not have the exif intact and I have no idea why. Why do some images have it and some do not? How can I keep exif intact on my own images and why would anyone not keep it intact?

 

[RebelTasha]

Maybe it depends on the host.
I thought Flickr kept it, they do on the site but not when I post a picture.
Dropshots the other host I use don't seem to keep it either..
I could be wrong since it's only been about 2 hours I have known how to read it using that opanda site..

 

[JerryPH]

Is there a way of looking at the Exif data without downloading the picture?
I use IE7.

I right click a pic and select OPEN WITH KUSO EXIF VIEWER or OPEN IMAGE IN PHOTOME. I don't download any pics.