Shooting a filament of a bulb - Creative Uses of CHDK - CHDK Forum
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Shooting a filament of a bulb

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Offline rhen84

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Shooting a filament of a bulb
« on: 24 / October / 2008, 07:57:14 »
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I shot this mini bulb with the following setup:

manual focus (I shot the bulb about 1,5-2cm away)
iso 10
shutter speed: 1/100.000
aperture: 16

As you can see the picture is very detailed.

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Offline PhyrePhoX

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Re: Shooting a filament of a bulb
« Reply #1 on: 24 / October / 2008, 08:11:18 »
well you can also turn off the bulb, then you wont have to use such an extreme shutter speed.

just kidding. you can try btw shooting the filament without any overrides, just with the maximum canon settings (i guess 1/2500 @ f8). would be interesting to see them both aligned.
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Offline rhen84

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Re: Shooting a filament of a bulb
« Reply #2 on: 24 / October / 2008, 08:22:47 »
Quote from: PhyrePhoX on 24 / October / 2008, 08:11:18
just kidding. you can try btw shooting the filament without any overrides, just with the maximum canon settings (i guess 1/2500 @ f8). would be interesting to see them both aligned.

here is with factory darkest settings:

shutter speed: 1/2000
aperture: 8
iso: 80

as you can see the filament is burn in the image.
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Offline ct

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Re: Shooting a filament of a bulb
« Reply #3 on: 24 / October / 2008, 17:10:52 »
Very nice comparison, chdk is the great
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Offline dzsemx

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Re: Shooting a filament of a bulb
« Reply #4 on: 25 / October / 2008, 00:54:06 »
notice: apertures above F8 causes very high diffraction (fine details gets washed out)
ISO50 is the lowest sensitivity on most canon cameras, setting below has no effect
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Offline rhen84

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Re: Shooting a filament of a bulb
« Reply #5 on: 25 / October / 2008, 05:47:20 »
Quote from: dzsemx on 25 / October / 2008, 00:54:06
notice: apertures above F8 causes very high diffraction (fine details gets washed out)
ISO50 is the lowest sensitivity on most canon cameras, setting below has no effect

I used the setup what you can see above. I know that some setup doesn't take effect for the shot. (for example I guess 1/100.00 shutter speed doesn't really 1/100.000, maybe 1/20.000)
I tried to shot the bulb with aperture 8, but i need to set my lamp to half bright to get the same photo. Here is the result.
I can't see any difference beatwin the halfbright-aperture8 and the fullbright-aperture16. So the aperture above 8 really get washed out?

The picture I've posted above with the camera darkest settings is half bright (my lamp has a two state switch, a bright and a brighter). I shot this picture with the camera darkest settings and the full bright of the lamp.
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Offline dzsemx

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Re: Shooting a filament of a bulb
« Reply #6 on: 25 / October / 2008, 07:31:59 »
Quote from: rhen84 on 25 / October / 2008, 05:47:20
So the aperture above 8 really get washed out?
just fine details... for exaple on landscape shots makes difference, just try it
btw here here is an article about that today's digital cameras have higher resolution sensors than the resolution of the lens
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Offline dzsemx

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Re: Shooting a filament of a bulb
« Reply #7 on: 25 / October / 2008, 07:54:46 »
David Bostock Photography: Lens Diffraction
just a fine example, right now i'm too lazy to go out an take a few shot :P
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Offline rhen84

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Re: Shooting a filament of a bulb
« Reply #8 on: 25 / October / 2008, 08:23:22 »
Quote from: dzsemx on 25 / October / 2008, 07:31:59
just fine details... for exaple on landscape shots makes difference, just try it
btw here here is an article about that today's digital cameras have higher resolution sensors than the resolution of the lens

When I started taking photograph, I havn't thought that photographing is so complicated.  :blink:

So if I have an A720 IS with sensor size 1/2,5", I give the clearest images with the aperture 3,5? link
So if I want larger DoF (use aperture8 for example) the picture will be less clear?
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Offline PhyrePhoX

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Re: Shooting a filament of a bulb
« Reply #9 on: 25 / October / 2008, 08:28:26 »
well these examples dzsemx gives deal with apertures much smaller. 22 is pretty damn small.
we have to do actual comparisons with actual powershots at these extreme settings.
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