[Leica] M8 Article in LFI

[douglas.sharp at gmx.de (Douglas Sharp)]

Well that clears everything up with a pointer to a ;-)  simple fix
For every shot you take, take a second shot through a dark red filter 
from precisely the same position and with precisely the same parameters 
- input both to Photoshop
reverse the IR image and subtract it by the destructive interference 
method from the other image by compositing the two. OOPS! that will only 
really work in BW :-(
Well... the ideas nothing worse than any thing Leica suggests to work 
around their cock-ups.
Douglas


Frank Filippone wrote:
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> The second problem that comes with the sensor's susceptibility to infrared 
> light is sharpness falloff. Depending on their
> wavelength, rays of light are refracted by different degrees of force. The 
> consequence is the so-called chromatic aberration, which
> has to be corrected for the colours of visible light in order to prevent 
> the contours in the periphery of a photo from dispersing
> and leaving colour fringes. Infrared light is refracted even weaker than 
> the red light, and this deviance remains uncorrected. Older
> lenses feature a red marking opposite the range scale, indicating to which 
> extent the focal plane shifts in infrared photography. If
> the infrared percentage of light is not filtered out, then a blurred, 
> slightly larger IR picture will overlay the sharp picture
> formed by the visible light. 
>
> ++++++++++++++++++++++++++
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>
> Frank Filippone
> red735i@earthlink.net 
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