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White balance settings when using ND filters


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38 minutes ago, Jeff S said:

+1. Or any other fixed K setting.  

Jeff

All shot at f4 ASA 100 and K5000

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10 stop

3 stop

Looks like that 10 stop is knackered 

Edited by Guest
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9 minutes ago, Jeff S said:

Seems so, assuming camera is functioning properly and all other conditions and settings controlled.

Jeff

On a Leica table top tripod at F4 ASA100. 

I will have a look online in the UK to see if I can get one shipped to my hotel in the Lake District.......... 60mm if I remember rightly 

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The only thing I can get online in the UK right now is the Breakthrough photography X4 CPL. I’m not sure if that will be dark enough to give me a 1 or 2 second exposure at F8 in midday light

any thoughts 

neil

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One review of many here...

https://www.the-digital-picture.com/Reviews/10-Stop-Neutral-Density-Filter.aspx

Color shifts can be an issue across some brands, and I suspect possible sample variation even within some brands.

I don’t see Formatt Hitech brand included  

You might just have to test yourself, or just rely on profiling/PP techniques.

Jeff

Edited by jaapv
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Google says a CPL will block out about 1.5 stops of light. I’m guessing stacking a 3 stop ND plus CPL will be enough to blur flowing water in midday light....... maybe 

neil

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8 hours ago, NW67 said:

All shot at f4 ASA 100 and K5000

No filter

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10 stop

3 stop

Looks like that 10 stop is knackered 

It certainly seems so.  A difficult cast to compensate completely, especially if you have reds in the image. I suspect that the main issue is that the filter does not reduce IR light. That second photo is fairly typical for an IR-contaminated image. You give it a try using it stacked with an IR cut filter (B+W 486)

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2 hours ago, jaapv said:

It certainly seems so.  A difficult cast to compensate completely, especially if you have reds in the image. I suspect that the main issue is that the filter does not reduce IR light.That second photo is fairly typical for an IR-contaminated image. You give it a try using it stacked with an IR cut filter (B+W 486)

I’ve just looked it up in the B+W filter handbook and this is exactly what is happening and yes, B+W recommends stacking with a 486 filter.  Problem solved.  :) 

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1 hour ago, jaapv said:

I’ve just looked it up in the B+W filter handbook and this is exactly what is happening and yes, B+W recommends stacking with a 486 filter.  Problem solved.  :) 

And the link I provided also demonstrated red shift.

Jeff

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Yes, it does, but lacks an explanation. IR colour shifts are particularly bothersome on Leica cameras. Focus shift might be an issue as well. It just demonstrates that using extreme ND filters should be avoided as much as possible - these are specialist tools, only to be used when one wishes to get a specific effect. Just screwing them on to get to f8 is not a good idea.

On a side-note: polarizers exhibit the same issues. Neil's idea of stacking a polfilter and an ND is unlikely to give a better result.

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6 hours ago, NW67 said:

Google says a CPL will block out about 1.5 stops of light. I’m guessing stacking a 3 stop ND plus CPL will be enough to blur flowing water in midday light....... maybe 

neil

As B+W recommends: stack your ND filter with a 486 filter.

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28 minutes ago, jaapv said:

Yes, it does, but lacks an explanation. IR colour shifts are particularly bothersome on Leica cameras. Focus shift might be an issue as well. It just demonstrates that using extreme ND filters should be avoided as much as possible - these are specialist tools, only to be used when one wishes to get a specific effect. Just screwing them on to get to f8 is not a good idea.

On a side-note: polarizers exhibit the same issues. Neil's idea of stacking a polfilter and an ND is unlikely to give a better result.

The Hoya Pro ND filters with ACCU-ND coating did not exhibit color shift like the other tested high density ND filters (but has other apparent issues).  I didn’t find any specifics on the coating properties, except metallic based, which I wonder if constitutes an IR blocking component.

Jeff

Edited by Jeff S
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That means that their spectral response extends into the IR wavelenghts. B+W clearly not. I doubt whether it is the coating. IR filtering is normally by absorption, not by reflection. It must be the optical glass used and the thickness thereof. Which might explain the poor optical performance.

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Could be.  The Formatt Hitech filters  claim to address all issues required to render true neutral response. 

https://www.formatt-hitech.com/learn-neutral-density

I’d never use a 10 stop filter, and tire of long exposure effects (right up there with bokeh craze for me), so I’ll leave to others for testing.

Jeff

Edited by jaapv
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6 hours ago, jaapv said:

I’ve just looked it up in the B+W filter handbook and this is exactly what is happening and yes, B+W recommends stacking with a 486 filter.  Problem solved.  :) 

Problem not solved.......... how do I get a 486 delivered on Monday in the UK when it’s a bank holiday?

neil

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