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Dust (or something on E-5 sensor)

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  • Dust (or something on E-5 sensor)

    I noticed these spots on my new E-5 whilst doing tests at F11 and above. The camera was sent to Olympus repair in Nottingham on 23rd March, and arrived back from Portugal today.

    I bought my E-5 from Park Cameras in January, and it arrived in the box minus the battery charger, charger cable and battery cover, When I informed them of this, they sent another E-5 box with the missing bits plus a few more, and after a couple of days phoned me asking to return the second box as it was needed for another camera. I don't know what was going on, but I suspect that the E-5 that I got from them had perhaps been used for demo purposes.


    [IMG][/IMG]
    Stewart

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  • #2
    Re: Dust (or something on E-5 sensor)

    That's awful service if described accurately. I don't see any reason why a new camera should have been removed from the box (or any of its accessories). If it was ex-demo you should have been told as such.

    The spots definitely look like dust. The picture was taken at f/18 and the extra depth of focus has brought the dust spots out. I suspect if you used something like f/5.6 they would almost disappear. Nevertheless, do check that SSWF is working and the use of a blower may shift some of the dust, but don't use canned air or a lens brush directly on the surface behind the mirror.

    If the camera has just come back from service, then assuming you can't shift the dust, I think a complaint to them is in order too.

    Ian
    Founder and editor of:
    Olympus UK E-System User Group (http://e-group.uk.net)
    Four Thirds User (http://fourthirds-user.com)
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    • #3
      Re: Dust (or something on E-5 sensor)

      I wonder if this only shows up at greater f numbers whether it is dust somewhere on a lens element. I say this because when I manually focus on an older lens a couple of dust specks come into focus when the subject is way out of focus but they are not visible in the final image. Another reason to suspect something like this is that whatever they are they are out of focus which had they been on the sensor surface should not have been the case. It might be worhwhile eyeballing the lens manually against a bright background (not the sun!) to see if anything is visible and perhaps check the mirror as well.

      I've always wondered about Park Cameras - I now don't need to wonder any more!

      David
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      • #4
        Re: Dust (or something on E-5 sensor)

        Originally posted by Ian View Post
        That's awful service if described accurately. I don't see any reason why a new camera should have been removed from the box (or any of its accessories). If it was ex-demo you should have been told as such.

        The spots definitely look like dust. The picture was taken at f/18 and the extra depth of focus has brought the dust spots out. I suspect if you used something like f/5.6 they would almost disappear. Nevertheless, do check that SSWF is working and the use of a blower may shift some of the dust, but don't use canned air or a lens brush directly on the surface behind the mirror.

        If the camera has just come back from service, then assuming you can't shift the dust, I think a complaint to them is in order too.

        Ian
        Ian,

        I sent it to Olympus service to have the dust removed. I didn't notice it until I tried F11 and upwards, and I sent it to Olympus because I thought there was a fault with the SSWF as the camera was very new, and I have never had problems with my E-500, E-1 or E-3. But it is now back and they have cleaned the sensor. There was no mention of whether the SSWF was faulty or not.
        Stewart

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        • #5
          Re: Dust (or something on E-5 sensor)

          Hehe! This thread gets more confusing by the second.

          OK, so the E-5 was fixed, if I understand correctly. I still think you have grounds to complain to Park Cameras if bits were missing and they wanted you to return boxes and everything.

          Presumably you had the correct warranty certificate with the correct body serial number? Did you get a special price?

          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)
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          • #6
            Re: Dust (or something on E-5 sensor)

            I understand that the anti alias filter is thinner on the E5 so therefore any dust will be closer to the real sensor than with the E3 and hence will give more of a shadow so we might expect to see more dust with the E5 (if the dust is not being shaken loose from the filter surface)
            This space for rent

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            • #7
              Re: Dust (or something on E-5 sensor)

              Just to follow on surely dust on the sensor blocks light from getting to the sensor site and that pixel will show up black or dark this will not change with F stops or lenses unless the dust physically moves on the sensor surface? If it does change with F stops it must be something in front of the sensor such as dust in a lens?
              I believe a sticky pad catches the dust shaken from the sensor and traps it, this needs changing with a service (not sure of time spans).
              Ed

              What if the Hokey Cokey is what its all about?

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              • #8
                Re: Dust (or something on E-5 sensor)

                Originally posted by Wee man View Post
                Just to follow on surely dust on the sensor blocks light from getting to the sensor site and that pixel will show up black or dark this will not change with F stops or lenses unless the dust physically moves on the sensor surface? If it does change with F stops it must be something in front of the sensor such as dust in a lens?
                I believe a sticky pad catches the dust shaken from the sensor and traps it, this needs changing with a service (not sure of time spans).
                You would be right if dust on the sensor was actually on the 'sensor', but actually it's not. In front of the sensor there are a couple of filters and it's on the first of these that the dust settles. So there is a small distance between the dust and the actual sensor sites.

                Nick
                Nick Temple-Fry

                Medicine as a science ranks somewhere between archaeology and economics.

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                • #9
                  Re: Dust (or something on E-5 sensor)

                  Originally posted by Nick Temple-Fry View Post
                  ... In front of the sensor there are a couple of filters and it's on the first of these that the dust settles. So there is a small distance between the dust and the actual sensor sites.

                  Nick
                  Amazing I never knew this !
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                  • #10
                    Re: Dust (or something on E-5 sensor)

                    I posted a diagram a long while ago, showing how dust spots show up more clearly with smaller apertures. I can't find the thread, maybe because it was started by a user that has since left ('olyflyer') and his threads have been removed.

                    Jim

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                    • #11
                      Re: Dust (or something on E-5 sensor)

                      Originally posted by Johnheatingman
                      Regarding dust on the sensor, this may seem like an incredibly stupid question but as I am relatively new to DSLR please bare with me.

                      If the SSWF removes the dust from the sensor where does it go ? Presumably it remains inside the camera body. If that is the case, is there not a likelyhood it will simply return onto the sensor if not removed ?

                      Again if that is the case how should the user go about removing any dust from inside the camera body ? Surely if a blower is used it will disturb any dust present and increase the possibility of it landing on the sensor.

                      John
                      There are some strips of sticky material to capture dust particles inside the mirror box if I recall correctly.

                      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
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                      • #12
                        Re: Dust (or something on E-5 sensor)

                        Originally posted by Jim Ford View Post
                        I posted a diagram a long while ago, showing how dust spots show up more clearly with smaller apertures. I can't find the thread, maybe because it was started by a user that has since left ('olyflyer') and his threads have been removed.

                        Jim
                        Olyflyer's posts have not been deleted, although he requested I close his account. His gallery remains too.

                        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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                        • #13
                          Re: Dust (or something on E-5 sensor)

                          Originally posted by DerekW View Post
                          I understand that the anti alias filter is thinner on the E5 so therefore any dust will be closer to the real sensor than with the E3 and hence will give more of a shadow so we might expect to see more dust with the E5 (if the dust is not being shaken loose from the filter surface)
                          No that's not the case. The SSWF is actually a large circular filter, which is quite thin, that is situated in front of the low pass filter. The latter is a solid lump of glass. The E-System layout was designed with anti-dust measures in mind, locating the SSWF filter as far in front of the sensor as possible. This is the main reason why Four Thirds DSLR cameras have such a long flange back in relation the sensor size. It's impossible to design this into legacy cameras like Nikons, Pentax, Canon, Sony (Minolta), etc.

                          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: Dust (or something on E-5 sensor)

                            Originally posted by Johnheatingman
                            As the Exif indicates you took the photo on the 20th March, can we assume you sent the E-500 for service as a result of seeing the dust marks and it has now been returned with the problem sorted ?

                            John

                            Yes John,

                            The problem seems to be sorted.
                            Stewart

                            My Zenfolio Site
                            My Portfolio Site

                            Olympus: E-M1 Mk11 | PEN-F + ECG-4 | XZ-1 | Lumix: G9 | LX100
                            Zuiko: 40-150 Pro + MC-14 | 12-100 Pro | 7-14 Pro | 17 | 45 | 60 | OM 135
                            Leica: 100-400 | 12-60 Lumix: 12-32 Samyang: 7.5 fisheye

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                            • #15
                              Re: Dust (or something on E-5 sensor)

                              Originally posted by Johnheatingman
                              As the Exif indicates you took the photo on the 20th March, can we assume you sent the E-500 for service as a result of seeing the dust marks and it has now been returned with the problem sorted ?

                              John
                              Originally posted by Ian View Post
                              Hehe! This thread gets more confusing by the second.

                              OK, so the E-5 was fixed, if I understand correctly. I still think you have grounds to complain to Park Cameras if bits were missing and they wanted you to return boxes and everything.

                              Presumably you had the correct warranty certificate with the correct body serial number? Did you get a special price?

                              Ian
                              Stewart

                              My Zenfolio Site
                              My Portfolio Site

                              Olympus: E-M1 Mk11 | PEN-F + ECG-4 | XZ-1 | Lumix: G9 | LX100
                              Zuiko: 40-150 Pro + MC-14 | 12-100 Pro | 7-14 Pro | 17 | 45 | 60 | OM 135
                              Leica: 100-400 | 12-60 Lumix: 12-32 Samyang: 7.5 fisheye

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