Canon Digital Photography Forums  

Go Back   Canon Digital Photography Forums > 'Sharing Knowhow' section > Talk About Photography > General Photography Talk
Register Rules FAQ Members List Search Today's Posts Mark Forums Read



Reply
 
Thread Tools Display Modes
Old 24th of October 2005 (Mon)   #1
windrunner
Junior Member
 
Join Date: Oct 2005
Posts: 6
Default Questions re: Photo Info

i am trying to make sense of the following photo information provided by iphoto (Apple format):

shutter speed 1 over 40
Aperture f4.0
Max Aperture f3.0
Exposure Bias 0.33
Focal Length 7.30mm

shutter speed is self explanatory as is aperture and exposure bias...

no clue as to max aperture and focal length...

i suspect a relationship exists amongst these values...

would like to know how this information (feedback) can assist me to take better pictures (for example, some pictures the difference between aperture and max aperture is one f stop, while on others it may be as wide as 4 to 5 stops)...

any information along these lines would be appreciated...

thanks in advance...
windr
windrunner is offline   Reply With Quote
This ad block will go away when you log in as member
Old 24th of October 2005 (Mon)   #2
robertwgross
Cream of the Crop
 
robertwgross's Avatar
 
Join Date: Nov 2002
Location: California
Posts: 9,462
Default Re: Questions re: Photo Info

I suggest that you find a basic tutorial on digital exposure.

The camera is choosing different apertures for different shots, and you sure would not expect it to use the maximum aperture for everything.

---Bob Gross---
robertwgross is offline   Reply With Quote
Old 24th of October 2005 (Mon)   #3
DavidW
Goldmember
 
Join Date: Jul 2005
Location: Bedfordshire, UK
Posts: 3,165
Default Re: Questions re: Photo Info

The maximum aperture is simply the maximum aperture of the lens. It may be camera dependent as to whether the maximum aperture is the maximum aperture of the lens at all focal lengths, or at that focal length (I'm too tired to jump into the EXIF specifications to find out, and both my DSLR lenses are constant aperture zooms).

Focal length is a measure of how zoomed you are - for want of a better term.


As Bob says, hunt around for tutorials on digital exposure. The small focal length tells you this was a digital compact camera (the wide end of the lens of the Ixus 700 on the desk in front of me is 7.7mm), and these small sensor cameras have higher depth of field at wide (small f number) apertures than a digital SLR would.



David
DavidW is offline   Reply With Quote
This ad block will go away when you log in as member
Old 25th of October 2005 (Tue)   #4
PhotosGuy
Moderator
 
PhotosGuy's Avatar
 
Join Date: Feb 2004
Location: S. E. Michigan
Posts: 67,339
Default Re: Questions re: Photo Info

Quote:
i suspect a relationship exists amongst these values...
These should help you figure it out:
Virtual Camera
Cameras Interactive aims to help novice photographers grasp the main concepts of SLR photography.
http://www.camerasinteractive.com/index.php#
Exposure explained: Three gateways for light.
http://www.canon.co.jp/Imaging/enjoydslr/p_2_005.html
Exposure - Low Tech Tips
http://www.photonhead.com/exposure/
SimCam
http://www.photonhead.com/exposure/simcam.php
__________________
FrankC - 20D, RAW, Manual everything...
Classic Carz, Racing, Air Show, Flowers.
www.FrankCizek.com

Find the light... A few Car Lighting Tips, and MOVE YOUR FEET!
Have you thought about making your own book? // Need an exposure crutch?
PhotosGuy is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Microsoft Photo Info darktiger RAW, Post Processing and Printing 20 2nd of April 2008 (Wed) 06:39
Ascorlight powerpack - info needed (Studio gear questions) DocFrankenstein Small Flash and Studio Lighting 4 20th of May 2007 (Sun) 14:33
Storring photo info? Ferco Accessories & Storage 2 18th of August 2006 (Fri) 19:30
Info on photo sqjaw Canon EOS Digital Cameras 10 22nd of April 2006 (Sat) 10:54
Photo Info Pamela107 RAW, Post Processing and Printing 5 30th of May 2005 (Mon) 08:23


All times are GMT -5. The time now is 03:37.


Powered by vBulletin® Version 3.6.12
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
This forum is not affiliated with Canon in any way and is run as a free user helpsite by Pekka Saarinen, Helsinki Finland. You will need to register in order to be able to post messages. Cookies are required for registering and posting. HTML in messages is not allowed, plain website addresses are automatically made active by the board.