Can the M8 do infra red photography?

[leicajh]

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Im sorry, but even after reading these threads, I dont know how to shoot i/r. I have an ir/uv cut filter, Is there after shooting processing? Thank you. jh

[fefe]

You need an IR pass filter like those and remove your current IR block filter:

filter IR 093 | B&H Photo Video

or these

B+W IR filter | B&H Photo Video

 

You also need to focus differently, using the f5.6 mark on your lense as the distance reference usually gives good results (the right one). The way I do it is focus with the rangefinder, and then look at the focusing scale and move the current selected point of focus in front of the f5.6 mark in the DOF scale.

 

Many lenses have a hot-spot in IR which means the center of the picture will gather a lot more IR left than the corners.

 

Here is a result I got last week with a 35 cron asph (handheld):

[leicajh]

Thank you so much. jh

[rwfreund]

Exposure compensation seems to depend on the amount of light at varying parts of the spectrum.

I have found that I need to set exposure comp to about -2ev when I shoot before dawn and -0 to +0.5 when shooting with daylight while using the 093 filter.

I am guessing that the photo diode used for exposure evaluation is somewhat more sensitive to ir than the sensor. When there is a smidgen of non-ir as is passed by the 093, the camera exposes more right than wrong, but when it is dark except for residual, probably longer wave ir, then it tends to over-expose.

-bob

[rwfreund]

If you do see a hot spot, it will mostly be in the blue channel.

For monochrome ir, in PS, convert to monochrome using only the red channel and then most of the hot spot will go away.

-bob

[rwfreund]

This is an example of a pre-dawn ir shot used for luminance and blended with a visitble light image for color in ps

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-bob

[gravastar]

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If you do see a hot spot, it will mostly be in the blue channel.

For monochrome ir, in PS, convert to monochrome using only the red channel and then most of the hot spot will go away.

-bob

This link will give you a list of which lenses do and don't show hot spots. In many cases the hot spot is most noticeable if the lens is stopped down.

 

 

Bob.