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Long Exposure, Black Glass
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Mar 3, 2012 00:53:42   #
chapjohn Loc: Tigard, Oregon
 
I have not the expsure in minutes yet. I am waiting to get one more piece of equipment for that. However, my plan would be to use small apeture, a CPL filter, and stack ND filters then put my VND on and turn it to max or 8 stops and use manual focus.

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Mar 26, 2012 07:40:32   #
captsteve Loc: NW Florida
 
I just did what you are trying to do a couple weeks ago.

I used a vivitar NDX filter (variable ND) it will go as dark as you like, but DO not try to use a cpl with it.

The NDX is basically 2cpl's mounted together with a graduated scale. I found mine for less than $30.00 and have had great sucess with it.

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Mar 26, 2012 10:47:18   #
Bruce H Loc: Oregon Coast
 
captsteve wrote:
I just did what you are trying to do a couple weeks ago.

I used a vivitar NDX filter (variable ND) it will go as dark as you like, but DO not try to use a cpl with it.

The NDX is basically 2cpl's mounted together with a graduated scale. I found mine for less than $30.00 and have had great sucess with it.


Post your photo, like to see it.

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Mar 26, 2012 21:21:19   #
captsteve Loc: NW Florida
 
I'll try to get one up, but it will take a while. I am currently at sea.

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Mar 28, 2012 13:08:09   #
Minceymomof9
 
I LOVE the contrast in the first shot. This is perfect to me.

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Mar 28, 2012 13:09:50   #
Minceymomof9
 
photogrl57 wrote:
Roger Salls wrote:
I'm not that familiar with Canons but there is no bulb setting?


There is a bulb setting on my Canon.


and on both of mine.

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Mar 28, 2012 13:13:26   #
Minceymomof9
 
Bruce H wrote:
Anyone here doing long exposure using black glass? This evening I went down to the sea using a .9 and a 1.8 ND filters (first try). This reduced my light about 9 stops but I never could get my exposure over 4 seconds. Wasn't all that bright. I am reading on the internet about 10 minute exposures using a 3.0 filter (10 stops) mid day, how is this possible? My ND value I wasn't that far off, or so I thought. What am I missing? Hoya makes a 2.7 (9 stops) filter which I thought I'd buy if I can't make this combination work.

I set the camera manually using the light meter in camera, centered not under exposed or over exposed. My photos turned out under exposed. I'd guess the white surf might have had something to do with this although it was really grey and not white like snow. I might have to add some shutter time to fix that, not sure about how much? I wasn't happy with what I shot. Does anyone have some insight? If you have some examples please post them.

camera is a 5D with 27-70 f2.8 lens. these RAW photos were taken at ISO 100, F16, 3.2 seconds at 24mm, .9 and 1.8 ND filter on together, 9 stops, manual exposure, cable release. I'd like a longer exposure creating softer water.
Anyone here doing long exposure using black glass?... (show quote)


Just curious, are these 2 different shots, or is the first one cropped?

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Apr 27, 2012 09:58:51   #
wagaboo Loc: Spokane Valley, Wa.
 
Here are 2 links related to ND filters that will prove useful...enjoy :)
http://www.redbubble.com/people/peterh111/journal/4421304-the-ultimate-guide-to-neutral-density-filters

http://www.10stop.net/about.asp

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Apr 27, 2012 18:46:44   #
GoofyNewfie Loc: Kansas City
 
Roger Salls wrote:
I'm not that familiar with Canons but there is no bulb setting?


Of course it does.
The problem is, even at minimum aperture and a low iso with the ND filters, the "proper exposure" is only about three seconds. Any longer and it will be overexposed.

Bruce- let us know when you've solved this and post a photo.

A friend who managed a camera store has a lot of stories to tell. This one reminded me of the customer who wanted to buy some more f-stops for his camera.

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Apr 29, 2012 09:58:41   #
NiagaraJim Loc: Niagara Falls, ON
 
Black glass is exactly that, More comonly called a Neutral Density filter.

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Jun 2, 2012 17:03:05   #
Bruce H Loc: Oregon Coast
 
Minceymomof9 wrote:
Bruce H wrote:
Anyone here doing long exposure using black glass? This evening I went down to the sea using a .9 and a 1.8 ND filters (first try). This reduced my light about 9 stops but I never could get my exposure over 4 seconds. Wasn't all that bright. I am reading on the internet about 10 minute exposures using a 3.0 filter (10 stops) mid day, how is this possible? My ND value I wasn't that far off, or so I thought. What am I missing? Hoya makes a 2.7 (9 stops) filter which I thought I'd buy if I can't make this combination work.

I set the camera manually using the light meter in camera, centered not under exposed or over exposed. My photos turned out under exposed. I'd guess the white surf might have had something to do with this although it was really grey and not white like snow. I might have to add some shutter time to fix that, not sure about how much? I wasn't happy with what I shot. Does anyone have some insight? If you have some examples please post them.

camera is a 5D with 27-70 f2.8 lens. these RAW photos were taken at ISO 100, F16, 3.2 seconds at 24mm, .9 and 1.8 ND filter on together, 9 stops, manual exposure, cable release. I'd like a longer exposure creating softer water.
Anyone here doing long exposure using black glass?... (show quote)


Just curious, are these 2 different shots, or is the first one cropped?
quote=Bruce H Anyone here doing long exposure usi... (show quote)


two different shots taken during the same visit.

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