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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 12 Jan 2018 (Friday) 11:47
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Basic lightmeter questions

 
Wilt
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Jan 24, 2018 16:36 |  #31

kat.hayes wrote in post #18548208 (external link)
1. While using the light meter it suggested an ISO 50 and 16, though the 5DM3 only goes down to 100. What is the best way to handle this? Speed up my shutter?

Thanks.

If you want ISO 50, simply set ISO 100 and then (if using Tv or Av) also set EC = +1
ISO 25 would be to set 100 and then (if using Tv or Av) also set EC = +2
ISO 16 would be to set ISO 125 then (if using Tv or Av) also set EC = +3


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DaviSto
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Jan 24, 2018 16:44 |  #32

kat.hayes wrote in post #18548208 (external link)
1. While using the light meter it suggested an ISO 50 and 16, though the 5DM3 only goes down to 100. What is the best way to handle this? Speed up my shutter?

2. For different readings, the meter suggested f3.6 though my lens only has has a 3.5. Same thing with my lens having a f7.1 while the meter suggested f7.0. Is this insignificant?

Thanks.

The light meter is giving you one combination of settings that will result in the 'right' exposure. There is a huge range of alternative aperture, shutter speed and Iso combinations that will give the same overall exposure value. Within that envelope, your challenge as the photographer is to find the combination that best suits your subject and your vision for the shot. You can find the full range of possible combinations of settings that are consistent with the meter reading by playing around with the different 'dials' on the meter.


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Alveric
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Jan 24, 2018 18:19 |  #33

I'd consult the manual to see how the meter can be set to match your camera's values (e.g. thirds of a stop). My meter never reports anything but settings that I can plug in (although it does put out 'decimals').


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Wilt
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Post edited 6 months ago by Wilt. (2 edits in all)
     
Jan 25, 2018 19:03 |  #34

kat.hayes wrote in post #18548208 (external link)
2. For different readings, the meter suggested f3.6 though my lens only has has a 3.5. Same thing with my lens having a f7.1 while the meter suggested f7.0. Is this insignificant?

Thanks.

f/no. +1/4 +1/3 +1/2 +​2/3 +3/4
- ---------------

f/2 2.2 2.24 2.3 2.5 2.6

f/2.8 3.1 3.2 3.4 3.5 3.7

The difference between 2/3EV and 3/4EV: 0.75 - 0.67 = 0.08EV, or less than 1/10th of an f/stop...so the difference between f/3.5 vs. f/3.6 is 0.04EV...not detectable by eye.


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F2Bthere
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Mar 07, 2018 01:35 |  #35

If you are metering flash, shutter speed only matters for the ambient (non-flash) light as long as the shutter speed isn't over the maximum sync speed.

If the meter is set at ISO 50 and we are talking about strobes, the shutter speed is NOT the thing to change. ISO 50 is one stop different from ISO 100. So if the meter says ISO 50 and f5.6, then you close down a stop to f8 for ISO 100.

You should be able to set your meter to ISO 100.

Set your camera and lights up. Take a meter reading. Lets say it is ISO 100 at f8. Take a note and take a picture. Then take pictures at different f-stops without changing anything else. f5.6, f6.3, f7.7, f8, f9, f10, f11. Compare and see which is properly exposed. If it is the one at f8, you are done and can use the meter as is. If not, figure out how many thirds of a stop you need to compensate to get an ideal exposure.


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Basic lightmeter questions
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