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Short exposure readout problem

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Offline llo599

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Short exposure readout problem
« on: 11 / November / 2010, 07:35:14 »
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Offline Microfunguy

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Re: Short exposure readout problem
« Reply #1 on: 11 / November / 2010, 09:57:21 »
Hello and welcome.

In removing the camera lens, you have also removed the mechanical shutter that closes AFTER the image is captured.

I had a similar effect with a lensless camera mounted on a microscope.

I had to make a tiny shutter using a pager motor and thin metal shim from feeler gauges.


If you have photos of your camera conversion, I would be interested in seeing large images, preferably here otherwise contact me.


David
« Last Edit: 11 / November / 2010, 10:12:47 by Microfunguy »
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Offline llo599

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Re: Short exposure readout problem
« Reply #2 on: 11 / November / 2010, 11:32:32 »
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Offline Microfunguy

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Re: Short exposure readout problem
« Reply #3 on: 11 / November / 2010, 11:47:32 »
« Last Edit: 11 / November / 2010, 11:52:04 by Microfunguy »
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Offline llo599

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Re: Short exposure readout problem
« Reply #4 on: 11 / November / 2010, 11:58:25 »
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Offline Microfunguy

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Re: Short exposure readout problem
« Reply #5 on: 11 / November / 2010, 12:02:07 »
You mention that you what to capture as much light as possible ... of course.

The telescope eyepiece forms an image of the objective at the 'eyepoint'.

In afocal systems, you position your unmodified camera at such a position that the eyepoint corresponds with the aperture position.

You are then capturing all of the light.

You will have to zoom a little to get inside the image circle.

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Offline Microfunguy

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Re: Short exposure readout problem
« Reply #6 on: 11 / November / 2010, 12:20:41 »
« Last Edit: 11 / November / 2010, 12:39:36 by Microfunguy »
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Offline llo599

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Re: Short exposure readout problem
« Reply #7 on: 11 / November / 2010, 16:58:38 »
I see the shutter may be the problem but I Aldo see this in the same cloudynigths page:

Quote
I found out this model does not use electronic shutter. In day-light photos, 1/30 and 1/320 shows the same amount of the exposure since there is no mechanical shutter any more.

Interesting to note that I also found out some of this model's aperture settings are simulated since there is no true iris/shutter-blades but just a full-open or ND-filter mechanical design.
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Offline Microfunguy

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Re: Short exposure readout problem
« Reply #8 on: 11 / November / 2010, 17:17:22 »
I am not sure what he is saying.

can you set the shutter speed on the A530 ?
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Offline llo599

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Re: Short exposure readout problem
« Reply #9 on: 11 / November / 2010, 17:24:29 »
Yes, but I don't know if there's any difference with too short exposure time. I will try later.

And post the pictures!

Thanks for your help
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