Unconverted Fuji x-a1 with Jupiter-11 and IR720 filter

At 135mm f4 the Jupiter-11 is not a lens most people would think of, but it can be fun to try such a telephoto for some interesting infrared results.  The Jupiter-11 has no discernible IR hot spots.  A hot spot is the centre circle of over exposure you get in infrared with many lenses due to the way the infrared light bounces around and focuses inside the lens.

With an unconverted (off the shelf) camera you are going to want to use a tripod most of the time, at the largest aperture of f4 at ISO200 you get around 2-5 second exposures, which can make for some great motion blur, clouds or water.  You will want to use the 2 second timer just to prevent camera shake.  The Fuji x-a1 is extremely clean when using long exposures (as are all the Fuji X cameras) and is well suited to IR.

fuji x-a1, jupiter-11, 5 second exposure
fuji x-a1, jupiter-11, 5 second exposure

Hand holdable shots are also possible at f4 in full sun at ISO3200 if you have a steady hand.  I generally set the camera to motor drive hold my breath and shoot 10 or 12 images in succession, you get a couple of sharp ones.  The below image was taken at 1/13th of a second.

hand held infrared, ISO3200 fuji x-a1, jupiter-11, IR720, 1/13th second
hand held infrared, ISO3200 fuji x-a1, jupiter-11, IR720, 1/13th second

I have also been experimenting with Hugin Panorama Stitch with is a free program which combine multiple images.  It works fine with infrared and if you already have the camera on a tripod it’s no big deal.  Just put a bit a bit of overlap in between shots.  Once the 4 images were stitched together I loaded the result in to GIMP to do the Red and Blue colour swap, the X-a1 produces some nice colour separation in infrared, which means you are not limited to black and white.

fuji x-a1, jupiter-11, ir720, 4 image hugin stitch
fuji x-a1, jupiter-11, ir720, 4 image hugin stitch

Technical details
Camera – Fuji X-a1 bayer CFA
Lens – Jupiter-11 135mm f4, LTM39 mount
Lens Adaptor – Fotasy L39-FX
Filter Adaptor – 40.5mm to 52mm (only used because most of my filters are 52mm)
Filter – 52mm IR720 (no name $13 filter)
Tripod mount/Grip – LB-XM1 (after market grip which allows access to memory card and battery)

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