Old 07-17-2010, 04:42 AM   #1
mark woody
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Default NICE one Loyd

Great shot Loyd thanks for sharing how you did it, how long was the exposure?

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Old 07-17-2010, 04:47 AM   #2
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Dang, I knew I forgot something. it was a 200 second exposure @ f6.3, ISO 100.

Thanks for the compliment!

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Old 07-17-2010, 03:38 PM   #3
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Black card, good thinking.
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Old 07-17-2010, 04:29 PM   #4
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Black card, good thinking.
Thanks J! I didn't realize that keeping trash in the car would prove useful until then.

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Old 07-17-2010, 09:07 PM   #5
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Black card, good thinking.
I wish I would have thought to use one for my Donner tunnel shot, then I would have been able to get the signals at the tunnel portal lit.
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Old 07-20-2010, 12:38 AM   #6
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It is a very nice shot...and it is great to see that instead of getting worked up about the use of the black card to modify what the camera recorded people have simply congratulated you for an interesting and well executed photograph.
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Old 07-20-2010, 12:44 AM   #7
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It is a very nice shot...and it is great to see that instead of getting worked up about the use of the black card to modify what the camera recorded people have simply congratulated you for an interesting and well executed photograph.
Why would anyone get worked up? It was one exposure.
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Old 07-20-2010, 12:50 AM   #8
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Why would anyone get worked up? It was one exposure.
Exactly
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Old 07-20-2010, 01:19 AM   #9
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Can someone explain to me how a black card works. Wouldn't covering part of the lens briefly kind of give you two different exposures on the same shot? I'm confused.

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Old 07-20-2010, 01:36 AM   #10
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Puttin a black card in front of the lens at night would be like turning off all the lights...NO light at all would be getting to the sensor. Once you move the black card out of the way allowing light to enter the lens, the exposure continues.
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Old 07-20-2010, 01:44 AM   #11
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Is that the same as doing a double exposure in camera?

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Old 07-20-2010, 02:28 AM   #12
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If the exposure continues how can it be a double exposure? One exposure for 200 sec using the available light, portion of that time no light.
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Old 07-20-2010, 03:05 AM   #13
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I'm just trying to understand how the black card works. It just appears to me that the black card is acting like a shutter, hence the double exposure. That's why I asked the question. Would it work the same way or is their some kind of magic to it?

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Old 07-20-2010, 03:26 AM   #14
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I'm just trying to understand how the black card works. It just appears to me that the black card is acting like a shutter, hence the double exposure. That's why I asked the question. Would it work the same way or is their some kind of magic to it?

Chris Z
Well, simply put, I guess it would be like a shutter...but technically it's not since all you're doing is blocking light from reaching the sensor (or film in an "old" camera. ) If you were taking a long exposure in a room, and then turned off the lights to make it completely dark, and then turned them on a again, that would be the same principle. Double exposure? I guess it just depends on how YOU want to define a double exposure.
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Old 07-20-2010, 05:46 AM   #15
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I'm just trying to understand how the black card works. It just appears to me that the black card is acting like a shutter, hence the double exposure. That's why I asked the question. Would it work the same way or is their some kind of magic to it?

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You can use your hand, a ball cap or a flattened out holder from a six pack of Coors.

OR:

you can purchase one of my special railphoto black cards - made to order and of most any size you want (really just pieces of black construction paper) for only 3 payments of $49.95 each.

If you act now, I can send you some steak knives too!



Seriously, the card is used to keep the bright headlights from the engines from blowing out the picture.

Yes you could do this with a double exposure, but you can use cards or block the light with film cameras too.

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