Page 2 of 2 FirstFirst 1 2
Results 16 to 26 of 26
  1. #16
    has a hat around here somewhere Site Moderator
    TPF Supporter

    Join Date
    May 2008
    Location
    UK - England
    Posts
    20,523
    My Gallery
    (0)
    My Photos Are OK to Edit
    Liked
    2912 times
    Quote Originally Posted by Overread View Post
    Understanding Exposure by Bryan Peterson
    I think a few more people in the thread need to get and read this book
    How to get critique on your photography!


    The Mentor Scheme mentoring on TPF all are welcome to read and apply

    Best photos on the net!
    well at least I like to think so - sometimes



  2. #17
    TPF Junkie!
    Join Date
    Mar 2008
    Location
    Boulder, CO
    Posts
    1,106
    My Gallery
    (0)
    My Photos Are NOT OK to Edit
    Liked
    18 times
    Quote Originally Posted by Overread View Post
    Quote Originally Posted by Overread View Post
    Understanding Exposure by Bryan Peterson
    I think a few more people in the thread need to get and read this book
    Indeed. The thread should have been locked as soon as you answered correctly by saying, go read that book. After that there is nothing left to say, and so far everything else has just lead to more confusion.
    Life's an adventure. Shoot it! Fullerton Images - Blog - FaceBook

  3. #18
    TPF Junkie!
    Join Date
    Apr 2008
    Location
    California, USA
    Posts
    1,661
    My Gallery
    (0)
    My Photos Are OK to Edit
    Liked
    22 times
    Quote Originally Posted by edouble View Post
    Quote Originally Posted by prodigy2k7 View Post
    Quote Originally Posted by edouble View Post
    ISO directly affects your shutter speed. Higher ISO = faster shutter speed.
    No. Changing your ISO only under or over exposes your photo. You compensate with changing aperture or shutter speed. For example: If you are in Tv mode, you are set to 1/500 and you change your ISO from 100 to 200, your aperture changes, not your shutter.

    Wow, that is the most absurd definition of ISO that I have ever heard. "ISO only under or over exposes your photo" - wrong wrong wrong wrong!!!! Changing ISO increases or decreases the sensitivity of the camera's sensor. Increasing or decreasing this sensitivity directly affects shutter speed.

    Is you shoot in a shutter priority mode then yes the aperature would change. A high ISO is 99.9999% of the time used for faster shutter speeds.

    Know what you are talking about before you tell others they are wrong

    From wikipedia "Film speed is the measure of a photographic film's sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. Relatively insensitive film, with a correspondingly lower speed index requires more exposure to light to produce the same image density as a more sensitive film, and is thus commonly termed a slow film. Highly sensitive films are correspondingly termed fast films. A closely related ISO system is used to measure the sensitivity of digital imaging systems. In both digital and film photography, the reduction of exposure corresponding to use of higher sensitivities generally leads to reduced image quality (via coarser film grainimage noise of other types). Basically, the higher the film speed, the worse the photo quality." or higher
    A higher ISO allows you to use a faster shutter speed, but it also allows you to change the aperture instead. Sure most people use higher ISO for faster shutter speeds, its very common, that doesnt mean ISO directly influences it. It doesn't. And YES your photo will become under or over exposed if you are in MANUAL mode, dont change your aperture/shutter and change your ISO.

    Edit: I was talking about the end result if you change your ISO without changing your aperture/shutter, yes the ISO is the sensitivity to light, but the end result is, under or overexposure of your photo, if you don't compensate. Yes its most common to change shutter speed, but you are acting like its friggin physics, and it MUST change the shutter speed, like its a science. Its not. You are just confusing the guy more. I wasn't defining ISO. I said exactly what it DOES (in the eyes of the person) not the technical stuff...
    Last edited by prodigy2k7; 10-14-2010 at 11:35 AM.
    Canon EOS 7D
    Canon EF 70-200mm F/2.8L USM
    Canon EF 50mm F/1.4 USM
    Canon Speedlite 480EX II
    Manfrotto 293 Tripod w/ QR ballhead *NEW*

  4. #19
    Been spending a lot of time on here!
    Join Date
    Nov 2009
    Location
    Orlando, FL
    Posts
    187
    My Gallery
    (0)
    My Photos Are OK to Edit
    Liked
    2 times
    If a male newbie asked this question, he would get immediate advises on how to use the "search" function...

    This forum is full of info about what you are asking. You do not need to buy a book immediately. Go to "Beginner's Photography" forum and type Aperture, shutter speed, ISO or simple "Exposure Triangle", and you will find lot more than you may expect.
    I remember some members even started tutorial threads with sample pictures...
    Canon T1i 500D with EF-S 18-55mm IS
    Canon EF-S 17-85 IS USM
    Canon EF 50mm USM f/1.4
    Canon Speedlite 430EX II
    Canon A640 with WCDC58N wide converter

  5. #20
    TPF Junkie!
    Join Date
    Jun 2008
    Location
    Arizona
    Posts
    9,893
    My Gallery
    (3)
    My Photos Are NOT OK to Edit
    Liked
    9 times
    Quote Originally Posted by Overread View Post
    Understanding Exposure by Bryan Peterson

    It's a book rather than a website but its well written and idealy suited to teaching you how to start using ISO, shutter speed and apertures both to achieve a correct exposure and going further to using the settings in a creative manner.
    Ian

    Canon 7D, Canon 30D, Sigma 10-20 f/4.5-5.6, Tamron 17-50 f/2.8, Canon 50 f/1.8 Mark I, Sigma 50-150 f/2.8, Canon 100 f/2.8 Macro, Sigma 100-300 f/4, Canon 400 f/5.6L, Sigma 1.4X & 2X EX TC, Canon 430EX, Bogen 3021 Tripod/Gitzo 1377M

    MY BETTERPHOTO

    MY SMUGMUG

    "If I have seen further , it is by standing on ye shoulders of giants." -- Sir Isaac Newton in a letter to Robert Hooke 15 February 1676 (... and a long telephoto doesn't hurt either ...)

  6. #21
    I spend too much of my life on TPF!
    Join Date
    Dec 2007
    Posts
    535
    My Gallery
    (0)
    My Photos Are OK to Edit
    Liked
    0 times
    If I was a newbie, I wouldn't understand what half of you guys are saying. Recommending the book is about the best advice.

  7. #22
    TPF Noob!
    Join Date
    Sep 2010
    Posts
    17
    My Gallery
    (0)
    Liked
    0 times
    I dunno...
    They're fairly simple concepts. Not sure there's a need to spend any money to understand them!

    ... just my opinion!
    My wedding photography site (work in progress!) http://weddings.robstokes.co.uk

  8. #23
    I spend too much of my life on TPF!
    Join Date
    Mar 2009
    Location
    WI
    Posts
    536
    My Gallery
    (0)
    My Photos Are OK to Edit
    Liked
    17 times
    ISO - this part determines how much light is needed to expose an image

    Shutter speed - Determines how long light will be hitting the sensor

    Aperature - How much light is let in when the shutter is open

    Changes to each inversly effect the other two, and making changes to them will give you different effects on the exposure... ie, Frozen motion, depth of field, motion blur.

    That's it.
    I is a photograph taker...

  9. #24
    TPF Junkie!
    Join Date
    Sep 2006
    Location
    Wichita, Kansas, USA
    Posts
    6,617
    My Gallery
    (0)
    My Photos Are OK to Edit
    Liked
    1143 times
    Quote Originally Posted by RSPhotography View Post
    I dunno...
    They're fairly simple concepts. Not sure there's a need to spend any money to understand them!

    ... just my opinion!
    Which is why Bryan Peterson wrote his book on Understanding Exposure and Ansel Adams wrote about the Zone System. The concept seems simple, however the application, given the physics of photography, is not.
    I've reached the age where my brain went from "You probably shouldn't say that" to "What the hell, let's see what happens."

    Amateurs worry about equipment, professionals worry about time, masters worry about light.


    "Yesterday is history, tomorrow is a mystery. Today?
    Today is a gift. That is why we call it the present."

    Master Wugui from Kung Fu Panda

  10. #25
    Dao
    Dao is offline
    TPF Junkie!
    Join Date
    Mar 2008
    Location
    St. Louis
    Posts
    5,963
    My Gallery
    (0)
    Liked
    349 times
    I think one important point a beginner need to know is....

    A photographer, most of the time, want to take a photo with "CORRECT EXPOSURE". Such as take a photo that it does not look too bright or too dark. There are exceptions of course.



    How to obtain the "correct exposure", it is a combination of setting the "Aperture", "Shutter speed" and ISO/ASA (which is kind of like a light sensitivity value).


    If correct exposure is 1 bucket of water.

    To fill 1 bucket of water, I need to use a hose. Of course with a bigger hose (larger aperture), I can fill the bucket faster. Therefore I only need 20 seconds (Shutter speed) to fill the bucket.

    Now, I can only use the smaller hose (smaller aperture) since the big one broke. To fill the same bucket, now it take 40 seconds. (double the shutter speed).

    The problem is, I need to fill one bucket in 20 seconds, 40 seconds is too slow. To solve the problem, I use a smaller bucket (ISO/ASA) which is half the size.


    The end result is the same, I have 1 bucket of water (correctly exposed photo)

    Hope that make sense.

  11. #26
    TPF Junkie!
    Join Date
    Nov 2009
    Location
    Southern Indiana, USA
    Posts
    2,449
    My Gallery
    (0)
    My Photos Are OK to Edit
    Liked
    993 times
    Quote Originally Posted by icassell View Post
    Quote Originally Posted by Overread View Post
    Understanding Exposure by Bryan Peterson

    It's a book rather than a website but its well written and idealy suited to teaching you how to start using ISO, shutter speed and apertures both to achieve a correct exposure and going further to using the settings in a creative manner.
    The nice thing about that book is that it has photo examples of the same scene so that you can see how each of the variables affect an image independently. Seeing those images side by side really makes it easy to understand exactly what is going on in a picture and how to adjust to get the effect you want. For me as beginner it felt like an epiphany learning that and that book made it easy. It's been out a good while and is probably available at the local library if you don't want to buy it but it's really nice to have. I'd be willing to bet it's the single most recommend book on photography out there and for good reason. It's easy to understand even for someone that has never picked up a camera before.

 

 
Page 2 of 2 FirstFirst 1 2

Ads

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Similar Threads

  1. help with aperture and shutter speed
    By simplyelegant in forum Photography Beginners' Forum
    Replies: 16
    Last Post: 03-02-2010, 08:34 PM
  2. Aperture and Shutter Speed
    By thinkricky in forum Photography Beginners' Forum
    Replies: 8
    Last Post: 06-03-2008, 08:15 AM
  3. Shutter Speed, Aperture, & WB Settings
    By ccdan in forum Beyond the Basics
    Replies: 13
    Last Post: 12-07-2006, 03:08 PM
  4. Aperture/Shutter Speed
    By gender bombs in forum Beyond the Basics
    Replies: 5
    Last Post: 11-09-2005, 03:37 PM
  5. aperture and shutter speed
    By alexlang in forum Beyond the Basics
    Replies: 4
    Last Post: 09-02-2004, 11:10 PM

Search tags for this page

aperture shutter speed iso formula

,
aperture, iso and shutter speed formula
,
formula for aperture and shutter speed
,
formula iso shter speed and aparcher
,
how aperture and shutter speed work together confused
,
iso aperture and shutter formula
,
iso aperture shutter speed formula
,
shutter speed formula
Click on a term to search for related topics.

Tags for this Thread