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Old Jun 17, 2005, 12:50 PM   #1
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Hi,

I am an amatuer used and continue using mainly Nikon equipment (FE's, Fe2's, F90's). Recently, I have bought a Sony DSC S40 digital camera. It is quite a remarkable and easy to use camera but until now I couldn't observe that aperture is changing due to change in light intensity or change in ISO setting. Also it is not possible to adjust manually. It seems that this camera does not have any aperture blade (Of course aperture value is changing when focal length of the camera changes).

hasanyone had similiar experience? or my unit is faulty?

Thanks for your comments/information.
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Old Jun 18, 2005, 11:06 AM   #2
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It may be fixed aperture, but many of the smaller P&S's have 2 apertures (or a ND filter that clicks in).

What does the EXIF data say for aperture? Do you ever see different values at the same focal length?

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Old Jun 19, 2005, 2:02 PM   #3
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Maxx thanks for your comments,

I have checked exif data. No change whatsoever in aperture. If focal length 5.1 mm, aperture is always F2.8.


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Old Jun 19, 2005, 11:36 PM   #4
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Try pointing itsomething bright, with a high ISO in P mode and half depress the shutter release a few times. If you look carefully at the lens while it focuses, do you see something that looks like a neutral density filter clicking in/out? Some of the Canons (Elphs)do this to avoid the diffraction caused by a small aperture in these small lenses. I find it hard to believe that they have a fixed aperture with no ND filter.

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Old Jun 20, 2005, 4:49 AM   #5
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I did exactly what you said but coudn't see eny ND filter kicking in. At ASA 400 setting, lens pointed sky, F2.8 being constant, you can read all shutter speeds upto 1/2000, but no filter is visible to the eye. It seems thet this is a fixed aperture camera which justifies its low price.

Thanks for your comments.

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Old Jun 21, 2005, 3:21 PM   #6
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I would think bright blue sky would be overexposed at 1/2000, F2.8, ISO 400. Does it force the ISO lower in that case?

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Old Jun 22, 2005, 12:32 PM   #7
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I have checked again. Claudy day 1/2000, F2.8. ISO value remains constant at 400.

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Old Jun 22, 2005, 8:07 PM   #8
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That's odd. My P150 says +2.0EV (max value) overexposed on a bright day with those settings.

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