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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 19 Apr 2017 (Wednesday) 09:13
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Getting to the right shutter speed

 
IainUK
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Apr 19, 2017 09:13 |  #1

Hi excuse what I'm sure is a simple question. I wanted to capture a long exposure using a 10 stop ND. The clouds weren't moving that fast so I wanted an exposure of at least a minute. Using one of the calculation apps, I knew that I needed the speed to be 1/15 to get to 1 min 10 stops down. My ISO was at L and I was using a middleish aperture. No matter what I did I could not get the exposure right in the viewfinder. The reason for the confusion was that I was sure that I saw a video of someone using a 1/15 shutter speed in bright sunshine and I don't think he was using any filters (prior to applying the 10 stop) to get to that. What am I missing?


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Apr 19, 2017 09:22 |  #2

When you say ISO was set for "L", numerically what does that mean?

That is a key part of the calculation and you have to be specific in your setting; eg - 50, 100, 200, etc.


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john ­ crossley
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Apr 19, 2017 09:27 |  #3

IainUK wrote in post #18331953 (external link)
Hi excuse what I'm sure is a simple question. I wanted to capture a long exposure using a 10 stop ND. The clouds weren't moving that fast so I wanted an exposure of at least a minute. Using one of the calculation apps, I knew that I needed the speed to be 1/15 to get to 1 min 10 stops down. My ISO was at L and I was using a middleish aperture. No matter what I did I could not get the exposure right in the viewfinder. The reason for the confusion was that I was sure that I saw a video of someone using a 1/15 shutter speed in bright sunshine and I don't think he was using any filters (prior to applying the 10 stop) to get to that. What am I missing?

Did you have the camera set to BULB to take the shot?


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john ­ crossley
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Apr 19, 2017 09:28 |  #4

sapearl wrote in post #18331956 (external link)
When you say ISO was set for "L", numerically what does that mean?

That is a key part of the calculation and you have to be specific in your setting; eg - 50, 100, 200, etc.

ISO 50


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Apr 19, 2017 09:34 |  #5

Could you also, please, be more specific than "middleish" aperture? Were you at f/8? f/11? The person in the video you saw may have been at f/16 or f/22.


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Apr 19, 2017 09:40 |  #6

You've learned one of the surprising lessons in photography. A 10 stop ND filter in bright sunlight is not enough to get really long shutter speeds.

If you start with the Sunny 16 rule it tells you that you need 1/ISO at f16 in bright sunlight so for you (I think L is usually ISO 50) that would be 1/50 shutter speed at f16 to start which is past mid-aperture to me.

But anyway, the shutter speed it is about 2 stops away from your starting goal of 1/15 shutter speed. You could get to 1/15 by closing down your lens two more stops to, if your lens has it, f32. That is not a mid-aperture but would have gotten you very close to the correct exposure.

For mid-day sun you might consider either a 14 stop ND filter or combining your 10 stop filter with a polarizing filter with to get 12 stops of ND.


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john ­ crossley
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Apr 19, 2017 10:01 |  #7

IainUK wrote in post #18331953 (external link)
No matter what I did I could not get the exposure right in the viewfinder.

Don't know what you mean by that, but when you stick a ten stop ND filter on the front of a lens the viewfinder will go dark.


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Apr 19, 2017 10:11 |  #8

What do you mean by "get the exposure right in the viewfinder"? If you're in bright/direct sunlight, you're always going to have your meter showing overexposure at a 1/15 shutter speed; that's just too much light. You would have to put the filter in place in order to get a proper exposure to meter. As others mentioned, depending on specific conditions, you may need to stack another filter to get the result you want. Several manufacturers are now offering 6-stop filters for just that purpose, to supplement their 10-stop ones.


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Apr 19, 2017 10:39 |  #9

Am I the only one that noticed that the OP said . . . "I wanted to capture a long exposure using a 10 stop ND. The clouds weren't moving that fast so I wanted an exposure of at least a minute." That would be fun :-) .


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IainUK
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Apr 19, 2017 10:42 |  #10

Hello, apologies for the lack of detail. I use using 70-200mm f2.8. The was shot at f8, ISO 50. Although this was less then a minute, I used Bulb in the end.
I was metering before I put the 10 stop on John :)


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Apr 19, 2017 10:47 |  #11

Why did you put the filter on John. Goes on the lens. ߘ


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john ­ crossley
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Apr 19, 2017 11:00 |  #12

IainUK wrote in post #18332038 (external link)
Hello, apologies for the lack of detail. I use using 70-200mm f2.8. The was shot at f8, ISO 50. Although this was less then a minute, I used Bulb in the end.
I was metering before I put the 10 stop on John :)
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So is this taken with or without the 10 stop filter?


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3Rotor
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Apr 19, 2017 11:07 as a reply to  @ john crossley's post |  #13

That appears to be with the filter on.


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Apr 19, 2017 12:31 as a reply to  @ IainUK's post |  #14

If you wanted to get a 1 minute exposure, you would've had to have stopped down to f/16.


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IainUK
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Apr 19, 2017 13:01 |  #15

It was with the filter on...


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Getting to the right shutter speed
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