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01/16/2009 08:04:08 PM · #1 |
i've been playing around with some long exposures, and can only get decent results at night.
i've got it at the highest fstop, lowest iso, on a 10 second exposure and its still overexposed during the day.
even with a nd filter, its still always overexposed.
anything i can do?! |
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01/16/2009 08:36:04 PM · #2 |
10 sec is a REALLY long exposure, what are you trying to image if I could ask. If you are trying to capture motion then much shorter exposures will work for that. You might try a little pinhole photography which allows for quite long exposures which allows you to capture ghosts and such.
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01/16/2009 08:48:28 PM · #3 |
You might have to stack some nd filters.
30 sec exposure with ND 3.0 . Takes away 10 stops of light. I think that most nd filters are a 0.3, which takes away 1 stop.
Which nd filter do you have ? What kind of pictures are you trying to take? Can you post what you have taken so far?
Message edited by author 2009-01-17 02:00:34. |
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01/16/2009 08:58:10 PM · #4 |
| If you have 2 CPF's (circular polarizing filter) on the lens rotating one of them will provide a variable ND filter from about ND2 to infinite. |
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01/17/2009 12:06:22 AM · #5 |
Originally posted by faidoi:
You might have to stack some nd filters.
30 sec exposure with ND 3.0 . Takes away 10 stops of light. I think that most nd filters are a 0.3, which takes away 1 stop.
Which nd filter do you have ? What kind of pictures are you trying to take? Can you post what you have taken so far? |
I agree if you want REALLY long exposures stacking ND filters is the way to go. I use two screw on (ND8 & ND4) and have two Cokin(ND4 and Grad ND4)that I can throw into the mix. Generally works.
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01/17/2009 02:57:10 AM · #6 |
Originally posted by boyd2000:
If you have 2 CPF's (circular polarizing filter) on the lens rotating one of them will provide a variable ND filter from about ND2 to infinite. |
Nice tip! I never realised that. |
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01/17/2009 04:05:15 AM · #7 |
another method is a IR filter
i've used a tiffen 87# to knock down nearly 9-12stops at noon...
  
just don't expect to get real color out of it ... |
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01/17/2009 04:54:09 AM · #8 |
| I've heard that some people have used sheets of welders glass held in front of the lens before, that might be worth a try for the longer daylight exposures (though I'm not sure what the image quality is going to be like after going through that though?). |
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01/17/2009 05:49:47 AM · #9 |
To get real colours from these types of shots couldn't you just set your WB to one of these shots and reshoot to get the true colours?
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01/17/2009 05:52:31 AM · #10 |
Originally posted by LVicari:
To get real colours from these types of shots couldn't you just set your WB to one of these shots and reshoot to get the true colours? |
No. The IR filter blocks all wave lengths of light except the infrared, so there's a very limited palette there. You can SHIFT the color, but you can't add any depth to it. May's well shift it in post...
R.
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01/17/2009 06:29:39 AM · #11 |
You could try my trick, as described here:
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01/17/2009 06:34:49 AM · #12 |
as bear said : when you see colors in an IR it is either a leaky filter (letting more light in to blue/green) , bandpass is letting more in (E.G.a 87 vs 87A vs 87C vs 92 vs tiffen #87) where the curves are all different .. , or the electronics is just trying to fool you .. ;)
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01/17/2009 07:03:30 AM · #13 |
Originally posted by discosheets:
i've been playing around with some long exposures, and can only get decent results at night.
i've got it at the highest fstop, lowest iso, on a 10 second exposure and its still overexposed during the day.
even with a nd filter, its still always overexposed.
anything i can do?! |
The best way around this is to use a very strong ND filter. I have a 10-stop ND filter for this purpose. This one is the one I use. |
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01/17/2009 07:51:00 AM · #14 |
I had one of these but it suffered a horrible death because I didn't make sure it was on tight and it fell off my lens and landed perfectly on a rock and shattered. I have yet to replace it. I take it no Iowa this weekend?
Originally posted by kirbic:
Originally posted by discosheets:
i've been playing around with some long exposures, and can only get decent results at night.
i've got it at the highest fstop, lowest iso, on a 10 second exposure and its still overexposed during the day.
even with a nd filter, its still always overexposed.
anything i can do?! |
The best way around this is to use a very strong ND filter. I have a 10-stop ND filter for this purpose. This one is the one I use. |
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01/17/2009 10:44:47 AM · #15 |
Originally posted by Bugzeye:
I had one of these but it suffered a horrible death because I didn't make sure it was on tight and it fell off my lens and landed perfectly on a rock and shattered. I have yet to replace it. I take it no Iowa this weekend?
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LOL, busted! I'm a lazy bastage, and I stayed home... actually, I couldn't convince anyone else to go, and didn't really want to go alone. That's my story, and I'm sticking to it!
Your ND story reminds me of the fate of my Hoya 77mm CPL. Put it on top my rental car in Sedona, AZ and promptly drove off with it still up there. I heard it sliding off as I turned onto the main highway, and realized what the noise was just as it slid off. The remains are still out there, somewhere! |
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01/17/2009 11:29:38 AM · #16 |
I spent my afternoon along the rock river here in town, my wife and I counted 5 Bald Eagles 3 females and 2 males.
Who needs to go to Iowa lol didnt get many pictures because of the landscape alot of brush etc, also the overcast really murdered the lighting. looks like they are going to hang around here for a bit so hopefully we will get some blue skies around here in the next day or two.
Originally posted by kirbic:
Originally posted by Bugzeye:
I had one of these but it suffered a horrible death because I didn't make sure it was on tight and it fell off my lens and landed perfectly on a rock and shattered. I have yet to replace it. I take it no Iowa this weekend?
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LOL, busted! I'm a lazy bastage, and I stayed home... actually, I couldn't convince anyone else to go, and didn't really want to go alone. That's my story, and I'm sticking to it!
Your ND story reminds me of the fate of my Hoya 77mm CPL. Put it on top my rental car in Sedona, AZ and promptly drove off with it still up there. I heard it sliding off as I turned onto the main highway, and realized what the noise was just as it slid off. The remains are still out there, somewhere! |
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01/17/2009 12:36:42 PM · #17 |
| A co-worker is going up to Priarie du Sac soon, I'll get a report from her when she returns. |
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