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Old 03-04-2014, 10:57 AM
johnnyt123 (John)
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Flats...

Has anyone tried using their laptop screen with a white background to take flats frames??
Does it work??

John
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Old 03-04-2014, 04:53 PM
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Octane (Humayun)
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Yes. I used to do this when shooting with lenses.

It works well -- so long as the screen is evenly-illuminated.

H
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Old 04-04-2014, 02:29 AM
popkrab (POP)
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I use laptop screen as well as my iPad too. It work well equally with my luminicent sheet.
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Old 04-04-2014, 12:58 PM
johnnyt123 (John)
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Thanks guys...

I gave it a go...
seems to do the trick well.....
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Old 04-04-2014, 03:38 PM
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LightningNZ (Cam)
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I'm a huge proponent of this method.

If the screen is big enough then you'll want to take many flat exposures with a range of rotational angles and side-side, up-down translations so that any blemishes will be evened out.

Cheers,
Cam
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Old 04-04-2014, 03:57 PM
johnnyt123 (John)
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Don't you have To keep the optical train setup exactly as it is when you image when you take flats?
How else will the program know where the dust particles are.??
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Old 04-04-2014, 04:00 PM
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I think Cam means to move the screen, not the optical train.
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Old 04-04-2014, 05:12 PM
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I used to sit the camera down on the laptop (17", so it was big enough) and just move the camera left and right, then up and down.

Take between 16 and 25. Don't forget to take corresponding darks frames.

All of this should be done at the native ISO of the system (for Canon, ISO-100).

H
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Old 04-04-2014, 06:58 PM
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Screwdriverone (Chris)
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For the blank white screen (adjustable too, in this program) use Al's Virtual light box, which is on the resources section of this website under files.

Here is the link ( I am using the iPad so I hope it works OK)
http://www.iceinspace.com.au/downloa...a5be135555aca5

Cheers

Chris
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Old 06-04-2014, 06:54 PM
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Sorry for not being clearer. Yes, as Simon said, just move the screen relative to your optical setup. I actually think there is good value in rotating one relative to the other as if there is any sort of grid pattern in the screen you will break this pattern up.
Cheers,
Cam
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