Archived posting to the Leica Users Group, 2007/12/13

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Subject: [Leica] Consensus (? on LUG) on IR filters on M8
From: philippe.orlent at (Philippe Orlent)
Date: Thu Dec 13 10:18:52 2007
References: <002e01c83d7b$d40617e0$> <>

Hi Ed,
And there I was thinking: those are damn funky bags...

Op 13-dec-07, om 15:38 heeft Eduardo Albesi het volgende geschreven:

> Vick,
> There are noticeable color differences between using and not using  
> the IR cut filters. The degree of how much noticeable this effect  
> is depends on the particular lighting conditions of each scene.   
> There are light sources that are more IR rich than others, as  
> tungsten and halogen lamps. The sun is another high power IR  
> emitter, but the high emissions in the rest of the visible spectrum  
> tend to mask the IR artifacts of the M8.
> Fluorescent light lacks typically IR emission in the M8 critical  
> band, so there's no problem under them.
> The following samples are under halogen light, with and without  
> filter, I think it cannot get worse than this:
> But it is effectively solved by the use of filters:
> Filter used is a B&W 486 UV/IR Cut filter. The lens is an Elmarit-M  
> 28/2.8 asph.
> Both files shot in DNG, converted to JPG in Adobe Camera Raw (PS CS3).
> There is another IR contamination effect that affects the M8: a  
> soft focus 'glow' under certain circumstances. This latter effect  
> is caused by the superposition of a focused visible-spectrum image  
> and an out of focus IR image (remember that the IR plane of focus  
> is slightly offset from the visible plane of focus, hence the  
> different focusing IR mark on older lenses). This has been  
> extensively exposed on other fora, especially the LUF.
> So, just color correcting the files does not solve the IR issue.  
> But with high quality IR filters (B&W, Heliopan or Leica) you don't  
> have any side effects, and the increased color and focus precision  
> you get are worth their use. BTW, I have never noticed any image  
> quality degradation using either brand.
> So, just mount them on every one of your lenses, forget about them  
> and enjoy the camera, one of the very best out there.
> Ed
> El 13/12/2007, a las 08:32, Vick Ko escribi?:
>> So, is there consensus on using IR filters on the M8, on lenses  
>> without
>> coding?
>> I've searched the archives a bit, and get the perception:
>> *    using the filter does degrade the image slightly
>> *    it does work, but the magenta flaw happens only under pretty severe
>> conditions anyway
>> *    for the majority of photo conditions, the filter isn't necessary
>> I've been tempted with an M8, from a very reliable source and very  
>> tempting
>> conditions.
>> ....Vick
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>> Leica Users Group.
>> See for more information
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Replies: Reply from eduardoalbesi at (Eduardo Albesi) ([Leica] Consensus (? on LUG) on IR filters on M8)
In reply to: Message from vick.ko at (Vick Ko) ([Leica] Consensus (? on LUG) on IR filters on M8)
Message from eduardoalbesi at (Eduardo Albesi) ([Leica] Consensus (? on LUG) on IR filters on M8)