iso sx230 - page 2 - General Discussion and Assistance - CHDK Forum
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iso sx230

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Offline reyalp

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Re: iso sx230
« Reply #10 on: 26 / March / 2013, 17:02:33 »
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Quote from: brustino on 26 / March / 2013, 09:54:58
thank, there aren't mode for long exposure with dayligth?
override diafram??or....???
bye
You could use an external neutral density filter, assuming you find some way to rig it in front of the lens.
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Offline Microfunguy

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Re: iso sx230
« Reply #11 on: 26 / March / 2013, 17:34:09 »
Quote from: reyalp on 26 / March / 2013, 17:02:33
You could use an external neutral density filter, assuming you find some way to rig it in front of the lens.

That is what I do with my S95 stereo rig.

See animated GIF below.

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Offline waterwingz

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Re: iso sx230
« Reply #12 on: 26 / March / 2013, 19:28:45 »
Quote from: waterwingz on 26 / March / 2013, 10:07:44
Or even better,  put a darker ND filter in front of the lens and set the exposure manually with CHDK.
Quote from: reyalp on 26 / March / 2013, 17:02:33
You could use an external neutral density filter, assuming you find some way to rig it in front of the lens.
Maybe we should suggest that he put an ND filter in front of his lens?   :blink:


Quote from: Microfunguy on 26 / March / 2013, 17:34:09
That is what I do with my S95 stereo rig.
I'm still kind of curious about why you would want to do that?  Slower shutter speed hoping to purposefully blur an action shot?
« Last Edit: 26 / March / 2013, 20:02:03 by waterwingz »
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Offline Microfunguy

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Re: iso sx230
« Reply #13 on: 26 / March / 2013, 20:58:37 »
Quote from: waterwingz on 26 / March / 2013, 19:28:45
Quote from: Microfunguy on 26 / March / 2013, 17:34:09
That is what I do with my S95 stereo rig.
I'm still kind of curious about why you would want to do that?  Slower shutter speed hoping to purposefully blur an action shot?

I was responding to how to fit a filter (or close-up lens) rather than specifically a ND filter.
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Offline waterwingz

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Re: iso sx230
« Reply #14 on: 26 / March / 2013, 21:20:25 »
Quote from: Microfunguy on 26 / March / 2013, 20:58:37
I was responding to how to fit a filter (or close-up lens) rather than specifically a ND filter.
Thanks - makes sense.  I still wonder why the OP wants to take extended shutter speed photos in daylight then. I guess we will await his response.

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Offline Microfunguy

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Re: iso sx230
« Reply #15 on: 27 / March / 2013, 07:53:02 »
Quote from: waterwingz on 26 / March / 2013, 21:20:25
I still wonder why the OP wants to take extended shutter speed photos in daylight

So you can blur subjects such as flowing water without stopping down.

Most users do not understand but on these small sensor cameras the aperture is effectively the set aperture multiplied by the crop factor (as far as depth-of-field is concerned).

So, f4 on my S95 is equivalent to f18 on a 35mm camera.
In fact, stopping down these cameras at all may lead to loss of sharpness.
My own tests showed that was the case with the S95.
At full telephoto and with no stopping down my S95 is effectively f22 !
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Offline waterwingz

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Re: iso sx230
« Reply #16 on: 27 / March / 2013, 08:31:10 »
Quote from: Microfunguy on 27 / March / 2013, 07:53:02
So you can blur subjects such as flowing water without stopping down.
Thanks - I figured it might be related to wanting an artistic effect.

Quote
Most users do not understand but on these small sensor cameras the aperture is effectively the set aperture multiplied by the crop factor (as far as depth-of-field is concerned).
Yes - I felt sorry for the user who posted last  year looking for help with Bokeh photography.  Pretty hard to replicate the f1.7 setting of a  50mm lens on an old 35mm film camera.
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