How to Calculate Long Exposure Times
Jun 17, 2021 11:41:13 #
This is an interesting video showing how you can calculate long exposure time without having to take your ND filters off the Camera. I just recently purchased the NISI filter system and I will definetly test this theory out.
https://www.youtube.com/watch?v=2b6I4RVqUNo
https://www.youtube.com/watch?v=2b6I4RVqUNo
Jun 17, 2021 11:58:23 #
Jun 17, 2021 12:07:12 #
Fotoartist wrote:
It is a timesaver.
It definitely is, not to mention a much safer method. I will be using the NISI filter system and with this method I reduce the risk of having to slide the filters off and on in order to get correct exposure readings. NISI filters are not inexpensive.
Jun 17, 2021 12:15:50 #
Fstop12 wrote:
This is an interesting video showing how you can calculate long exposure time without having to take your ND filters off the Camera. I just recently purchased the NISI filter system and I will definetly test this theory out.
https://www.youtube.com/watch?v=2b6I4RVqUNo
https://www.youtube.com/watch?v=2b6I4RVqUNo
I do something similar in that I compose and focus with the filters on by simply maxing out the ISO. I then use a cell phone light meter and a cell phone long exposure app to determine the correct exposure time at ISO 100. This works with my camera (6D2) easily using a 10 stop plus CP filter. His method should save some time tho. In the future, I will use max ISO to compose and focus, then use ISO 6400 to determine actual exposure time.
Thanks for this video, it should be very useful.
Jun 17, 2021 12:30:18 #
jackm1943 wrote:
I do something similar in that I compose and focus with the filters on by simply maxing out the ISO. I then use a cell phone light meter and a cell phone long exposure app to determine the correct exposure time at ISO 100. This works with my camera (6D2) easily using a 10 stop plus CP filter. His method should save some time tho. In the future, I will use max ISO to compose and focus, then use ISO 6400 to determine actual exposure time.
Thanks for this video, it should be very useful.
Thanks for this video, it should be very useful.
Your welcome. I haven't tried this yet. I have two apps on my phone ND Timer and the NISI app that will give you the correct exposure time but it requires you to get the correct exposure settings with the filter off the camera. Being able to get an exposure time with the filters on is a nice option considering the risk of damaging the filters everytime you take them off, put them back on etc. My NISI filters aren't inexpensive.
Jun 17, 2021 12:33:25 #
Jun 17, 2021 13:27:36 #
Timmers
Loc: San Antonio Texas.
A nice way to calculate an exposure for your digital camera. I will be a pain in the ass and point out that it is not good practice to stack more than two (2) filters on an optic. And this is fine for digital cameras but will not work with film as there are several issues with exposure related to intermittency effect and some other issues (unless the film is super cooled with liquid nitrogen).
Jun 17, 2021 13:40:46 #
Timmers wrote:
A nice way to calculate an exposure for your digital camera. I will be a pain in the ass and point out that it is not good practice to stack more than two (2) filters on an optic. And this is fine for digital cameras but will not work with film as there are several issues with exposure related to intermittency effect and some other issues (unless the film is super cooled with liquid nitrogen).
Not everybody does "good practice",
they do what they desire.
Might reciprocity be one of the problems with film?
Jun 17, 2021 17:43:52 #
Fstop12 wrote:
Your welcome. I haven't tried this yet. I have two apps on my phone ND Timer and the NISI app that will give you the correct exposure time but it requires you to get the correct exposure settings with the filter off the camera. Being able to get an exposure time with the filters on is a nice option considering the risk of damaging the filters everytime you take them off, put them back on etc. My NISI filters aren't inexpensive.
Instead of using the camera, I was using a cell phone exposure meter that is surprisingly accurate. No need to remove filters.
Jun 17, 2021 17:47:19 #
Timmers wrote:
A nice way to calculate an exposure for your digital camera. I will be a pain in the ass and point out that it is not good practice to stack more than two (2) filters on an optic. And this is fine for digital cameras but will not work with film as there are several issues with exposure related to intermittency effect and some other issues (unless the film is super cooled with liquid nitrogen).
Reciprocity failure made long film exposures nearly impossible, for me at least. Way too much guesswork, trial and error. and expense.
Jun 17, 2021 18:20:04 #
jackm1943 wrote:
Instead of using the camera, I was using a cell phone exposure meter that is surprisingly accurate. No need to remove filters.
Can you elaborate more on that please? Is that an app for the phone, if so, what app?
Jun 17, 2021 19:14:26 #
Fstop12 wrote:
Can you elaborate more on that please? Is that an app for the phone, if so, what app?
The one I like best is the MyLightMeter app for my iPhone (don't know if it's available for non-iPhones). I've checked it against my camera, my classic Pentax spotmeter, and my Minolta IVF, and they all agree nearly identically. Once I quickly get that reading, I use the LECalculator app to quickly get the exposure time for the 10 or more stops of ND filtration I'm using. By doing this, along with composing and focusing at high ISO, I never have to remove the filter(s). It will be even easier using the OP's suggestion.
Jun 17, 2021 19:38:32 #
jackm1943 wrote:
The one I like best is the MyLightMeter app for my... (show quote)
Thanks for for the response.
Jun 18, 2021 10:43:54 #
Jun 18, 2021 18:58:11 #
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