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UltravioletPhotography

Multispectral test with filter rings


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Finally, after years of having my filters attached to a cardboard/tape roll, I mounted them in appropriate filter rings. This improves versatility a lot.

 

I took a UV, VIS and IR image of a plant to test multispectral stacks. The filter rings allow me to change my filters without moving my camera (at least, reducing the forces on the lens).

 

I didn't refocus, and I didn't align the images, so enjoy some chromatic aberration. The paper tissue was used as a white balance target. UV, VIS and IR images white balanced in-camera, stacks white balanced in Photo Ninja (it provides better results than IrfanView).

 

This time I worked with .tif files, so the quality should be better.

 

Camera: full-spectrum Canon EOS M;

Lens: Soligor 35 mm f/3.5.

 

Filters:

UV: ZWB2 (2 mm) + Chinese BG39 (2 mm);

VIS: Chinese BG39 (2 mm);

IR: Hoya R72.

 

UV (f/8, ISO 100, 8 s exposure):

post-284-0-51313900-1623859659.jpg

 

VIS (f/8, ISO 100, 1/125 s exposure):

post-284-0-68526400-1623859667.jpg

 

IR (f/8, ISO 100, 1/60 s exposure):

post-284-0-04476300-1623859680.jpg

 

TriColour (IR = red, VIS = green, UV = blue):

post-284-0-27521600-1623859939.jpg

 

IRG:

post-284-0-27228800-1623860008.jpg

 

GBU:

post-284-0-57668500-1623860087.jpg

 

Notes:

- My Chinese BG39 is not the best filter to cut UV/IR, because it doesn't cut UV at all (at least, most UV) and it suppresses the reds too much. But this is what I have at the moment.

- IRG and GBU should be quite known abbreviations here, but to recap:

An IRG image has infrared in the red channel, red in the green channel and green in the blue channel;

A GBU image has green in the red channel, blue in the green channel and UV in the blue channel.

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