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  • Sony alfa 100

    A month ago I bought a Sony Alfa 100. I'm using it with a Sigma Zoom Apo 75-300 mm. But now I'm not satisfied about the sharpness of my photos.

    Who has experience with this camera?
    What modus can I use best?
    Is the Sigma lens not so good and must I buy a Sony lens 75-300mm?

    I have uploaded a photo, so yoy can see it is not as sharp as I expected.



    Paul Stam

  • #2
    Hi Paul,
    I also use A100 now, I like it and i think the proplem is from your lens, can you ask yr friends or someone to try with another lens. you can see me photos took buy A100 with APO 100-300 F4 in this site.
    rgds,
    kanehoshi


    I love JP.net

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    • #3
      I find it hard to accept that its your lens as you got a quality model? Perhaps it could be the settings you are using on your camera? Are you using auto? Perhaps the aperture settings might give you better results?



      http://stu-doherty.fotopic.net

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      • #4
        I'd say it's the settings, that shot looks Neat Imaged to hell, doubt the lense could actually make it like that.

        Comment


        • #5
          Could you please post a bit more about the photo? Settings, what weather/light did you have .....

          I tend to believe, that it is just wrong camera settings and light not really favourable for such action shots. The aircraft looks awfully blurry. Judging by the "neat image" look, I also think, the original photo may have been too noisy, which could have been a result of underexposure. Perhaps you tried to get a faster shutter speed, but simply not fast enough for a tack sharp photo and too fast for allowing enough light into the camera. The only open variables here for me are ISO and F-stop.
          My photos on Flickr www.flickr.com/photos/geridominguez

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          • #6
            Considering the prop blurr, I would say exposure time was very long. Must be a problem with the settings
            My photo editing guide - updated and improved Feb. 2010
            My Nikon D100,D200,D300, D800, D7200 basic spotting settings guide
            ACIG - the best resource for military aviation information

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            • #7
              Thank you foor your reactions.

              There has been asked to the settings. The settings of the photo of my first message are:

              ImageDescription - SONY DSC
              Make - SONY
              Model - DSLR-A100
              Orientation - Top left
              XResolution - 72
              YResolution - 72
              ResolutionUnit - Inch
              Software - DSLR-A100 v1.04
              DateTime - 2007:05:28 14:59:33
              YCbCrPositioning - Centered
              ExifOffset - 390
              ExposureTime - 1/500 seconds
              FNumber - 6.30
              ExposureProgram - Shutter priority
              ISOSpeedRatings - 100
              ExifVersion - 221
              DateTimeOriginal - 2007:05:28 14:59:33
              DateTimeDigitized - 2007:05:28 14:59:33
              ComponentsConfiguration - YCbCr
              CompressedBitsPerPixel - 8 (bits/pixel)
              BrightnessValue - 9.50
              ExposureBiasValue - 0.00
              MaxApertureValue - F 5.60
              MeteringMode - Multi-segment
              LightSource - Auto
              Flash - Not fired, compulsory flash mode
              FocalLength - 300.00 mm
              UserComment - SONY DSC
              FlashPixVersion - 010
              ColorSpace - sRGB
              ExifImageWidth - 3872
              ExifImageHeight - 2592
              InteroperabilityOffset - 25212
              FileSource - Other
              SceneType - Other
              CustomRendered - Normal process
              ExposureMode - Auto
              WhiteBalance - Auto
              DigitalZoomRatio - 0 x
              FocalLengthIn35mmFilm - 450 mm
              SceneCaptureType - Standard
              GainControl - None
              Contrast - Normal
              Saturation - Normal
              Sharpness - Normal

              I hope you can tell me what went wrong.

              Kindly regards,

              Paul Stam

              Comment


              • #8
                Yeah,
                Next time, can you change to mode P and set :
                Contrast - Normal
                Saturation - Normal
                Sharpness - +1
                and FocalLength under 300.00 mm (not full zoom)
                Good luck,


                I love JP.net

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                • #9
                  I notice some things.

                  Given the weather ISO100 might be not enough. Try 160 or 200.

                  Multisegment metering is also not a good choicem center weighted is better.
                  My photo editing guide - updated and improved Feb. 2010
                  My Nikon D100,D200,D300, D800, D7200 basic spotting settings guide
                  ACIG - the best resource for military aviation information

                  Comment


                  • #10
                    Judging by the exp.time (1/500) and the blurry look, Either you cropped out a samll part of the entire photo and/or you need a pair of steady hands.

                    I think, the photo came out too underexposed, you brightened it up, saw the noise and tried to get rid with a noise reducer. Can you post the original file somewhere?
                    My photos on Flickr www.flickr.com/photos/geridominguez

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                    • #11
                      Mainly a problem with inexperience, I think.

                      I used the predecessor to your Sigma lens (on Canon DSLRs) for a couple of years to good effect. In addition to the problems that the other posters have noted, budget zoom lenses are not at their best at full zoom with the aperture wide open – which is the case with this image as you were shooting at 300mm and f/5.6. You’ll get better results by stopping down to f/8 and/or trying to keep your focal length under 270-280mm.
                      Phil
                      www.pbase.com/pgilston

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                      • #12
                        Thank you for all your advices. I shall tried them friday and saterday at the "Open dag" of the Dutch Airforce at Volkel.

                        As an attachement I send a original photo of the Yak 11. I have resized it from width 3872- heigth2592 to 1280-857 otherwise it was not possible to upload.

                        Greetings,

                        Paul Stam

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                        • #13
                          I don't have any Sony 100, only a Pentax but with Aperture Priority F8.0 I get sharp pictures!

                          Ruben

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                          • #14
                            Now the orignal is not all that bad, seems like some bad errors in post processing as well. I will be at Volkel on one of the days as well.
                            My photo editing guide - updated and improved Feb. 2010
                            My Nikon D100,D200,D300, D800, D7200 basic spotting settings guide
                            ACIG - the best resource for military aviation information

                            Comment


                            • #15
                              Originally posted by seahawk
                              Now the orignal is not all that bad, seems like some bad errors in post processing as well.............. .
                              What!!

                              And they are different photos.
                              My contribution to JetPhotos

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