help using lee filters

So i recently got using some Lee filters, and the way i was told to work out the filter you need to use is to meter for the sky then meter for the ground and the difference between the two is the strength of filter you need to use, so is there an app that will work this out for you? or is there a simply way to do this?

There is a Lee Filter app at the Mac App and probably at an Android store.
Lou Cioccio

The app lets you know how long an exposure you need when using the Little, big and super stoppers,

https://www.manfrottoschoolofxcellence.com/2016/05/nd-filters-use/

Here you go... this should help you clarify what an ND filter is for and can do.

bikeit said:

So i recently got using some Lee filters, and the way i was told to work out the filter you need to use is to meter for the sky then meter for the ground and the difference between the two is the strength of filter you need to use, so is there an app that will work this out for you? or is there a simply way to do this?

Click to expand...

Simple methodology: put your camera in M exposure mode and center weighted metering mode and turn Auto ISO off. Then point the camera to the sky and adjust the shutter or aperture until you get the meter centered to zero. This is your starting point. Then direct the camera to the foreground, and start adjusting aperture or shutter speed until you get the meter zeroed again. In my cameras each click is one third of a stop, so three clicks means one stop. Two examples: if I'd get 10 clicks, it is 3 and 1/3 stops. If I'd get 14 clicks it is 4 and 2/3 stops.

After this set your camera back to your preferred operating mode: Auto ISO, matrix metering, Aperture priority or whatever is your choice.

I take it you have graduated ND filters, and want to balance foreground to the sky? Remember, that Lee is is in the filter selling business and they gladly sell you lots of filters. I hope you bought the iRND versions that are glass, instead of the terrible plastic (resin) ones. Long story shot, if you really really want to use a ND grad, then a 3-stop version (0.9) is actually all you'll need, imho.

There was a parallel thread about ND grads just a couple of days ago, please see there for my test of dramatic image degradation using a plastic Lee filter: https://nikonites.com/photography-q-and-a/41594-landscape-kit.html#post665932

Follow the link and in post #3 you'll find links to three full size samples I shot a couple of days ago.

Guys thank you so much this information is brilliant all I was looking for

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