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F Stop Value

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  • F Stop Value

    Hi All,

    Just a real quick question if you don't mind.

    Whats the oly F value Equivalent of Canon 400D F22?

    Cheers
    G

  • #2
    Re: F Stop Value

    I maybe wrong, but I though the F value was for the amount of light let though the lens, so shouldn't it be the same?

    Comment


    • #3
      Re: F Stop Value

      sorry I meant aperture F value

      Comment


      • #4
        Re: F Stop Value

        The equivalent of f22 is f22. An f number is an f number no matter the system neg/sensor size or focal length. It is a ratio of the width of the aperture to the distance to the film/sensor plane.

        Ian C.

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        • #5
          Re: F Stop Value

          Garrie

          Are you asking about DOF???
          All the best

          Being left handed my brain sometimes works sdrawkcab

          Andy

          Lots of cameras and lenses.


          My Flickr

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          • #6
            Re: F Stop Value

            Hi Andy,

            Yeah I thats what I'm meaning, I'm rubbish at explaining stuff

            Cheers

            Comment


            • #7
              Re: F Stop Value

              Try these from Andrzej Wrotniak brilliant site.I believe DOF is greater for 4/3 cameras due to the smaller sensor.


              http://www.wrotniak.net/photo/tech/dof-43.html

              http://www.wrotniak.net/photo/tech/dof.html
              All the best

              Being left handed my brain sometimes works sdrawkcab

              Andy

              Lots of cameras and lenses.


              My Flickr

              Comment


              • #8
                Re: F Stop Value

                MINT - Cheers Andy

                Comment


                • #9
                  Re: F Stop Value

                  Please remember that from F5.6 onwards your lens will deliver softer and softer images - f/22 is to be avoided if at all possible. f/5.6-f/6.3 is the sweet spot for Four Thirds cameras. The softness as the aperture gets smaller is due to the effects of diffraction along the edges of the aperture blades at very small physical aperture sizes.

                  Ian
                  Founder and editor of:
                  Olympus UK E-System User Group (http://e-group.uk.net)
                  Four Thirds User (http://fourthirds-user.com)
                  Digital Photography Now (http://dpnow.com)
                  Olympus camera, lens, and accessory hire (http://e-group.uk.net/hire)

                  Twitter: www.twitter.com/ian_burley
                  Flickr: www.flickr.com/photos/dpnow/
                  Pinterest: www.pinterest.com/ianburley/
                  NEW: My personal BLOG ianburley.com
                  sigpic

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                  • #10
                    Re: F Stop Value

                    Originally posted by Ian View Post
                    Please remember that from F5.6 onwards your lens will deliver softer and softer images - f/22 is to be avoided if at all possible. f/5.6-f/6.3 is the sweet spot for Four Thirds cameras. The softness as the aperture gets smaller is due to the effects of diffraction along the edges of the aperture blades at very small physical aperture sizes.

                    Ian
                    Thanks Ian - I didn't know that Maybe that's why I'm often disatisfied with the sharpness of my E-1?

                    Comment


                    • #11
                      Re: F Stop Value

                      Originally posted by Ian View Post
                      Please remember that from F5.6 onwards your lens will deliver softer and softer images - f/22 is to be avoided if at all possible. f/5.6-f/6.3 is the sweet spot for Four Thirds cameras. The softness as the aperture gets smaller is due to the effects of diffraction along the edges of the aperture blades at very small physical aperture sizes.

                      Ian
                      Thats interesting, I have been led to believe the sweet spot on the 14-54 was nearer F16 before diffraction set in? Any landscape togs here wish to comment? Also does this differ with different lenses. I have had what I consider poor results on anything landscape wise where DOF was needed.
                      Last edited by Scapula Memory; 28th February 2008, 04:24 PM. Reason: spelling

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                      • #12
                        Re: F Stop Value

                        Originally posted by Scapula Memory View Post
                        Thats interesting, I have been led to believe the sweet spot on the 14-54 was nearer F16 before diffraction set in? Any landscape togs here wish to comment? Also does this differ with different lenses. I have had what I consider poor results on anything landscape wise where DOF was needed.
                        Here is a plot of the sharpness of a 50mm f/2 Digital Zuiko through its aperture range. The smaller the (DxO Blur Experience Unit or BXU the less blurred (more sharp) the lens is) :


                        There probably isn't a lens much sharper than this in Four Thirds and the edge/edge sharpness is very uniform, even at full aperture.

                        You can see that sharpness peaks at f/2.8 here, but f/16 is quite a way down.

                        Ian
                        Founder and editor of:
                        Olympus UK E-System User Group (http://e-group.uk.net)
                        Four Thirds User (http://fourthirds-user.com)
                        Digital Photography Now (http://dpnow.com)
                        Olympus camera, lens, and accessory hire (http://e-group.uk.net/hire)

                        Twitter: www.twitter.com/ian_burley
                        Flickr: www.flickr.com/photos/dpnow/
                        Pinterest: www.pinterest.com/ianburley/
                        NEW: My personal BLOG ianburley.com
                        sigpic

                        Comment


                        • #13
                          Re: F Stop Value

                          Originally posted by E-1 fan View Post
                          Thanks Ian - I didn't know that Maybe that's why I'm often disatisfied with the sharpness of my E-1?
                          E-1s, by default, have minimal sharpening set, so you should have plenty of sharpening latitude in post processing.

                          Ian
                          Founder and editor of:
                          Olympus UK E-System User Group (http://e-group.uk.net)
                          Four Thirds User (http://fourthirds-user.com)
                          Digital Photography Now (http://dpnow.com)
                          Olympus camera, lens, and accessory hire (http://e-group.uk.net/hire)

                          Twitter: www.twitter.com/ian_burley
                          Flickr: www.flickr.com/photos/dpnow/
                          Pinterest: www.pinterest.com/ianburley/
                          NEW: My personal BLOG ianburley.com
                          sigpic

                          Comment


                          • #14
                            Re: F Stop Value

                            I hate using it though Ian - I know it's daft but still feels like cheating

                            I'd much rather get the basics right in camera if possible.

                            Do you have similar charts for the 35mm ZD and the 40 -150mm?

                            I'd love to know the optimum aperture for both of these too

                            Comment


                            • #15
                              Re: F Stop Value

                              Excellent post Ian, thanks, that is very interesting to see. Quite a difference from F11 onwards. This explains a few things about some of my pictures from the Lakes last year.

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