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Fun with reverse lens macros

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With the onset of the rainy season in our islands and not having much time to go birding, I've started having fun with reverse lens macros.
I attached the reversed 50 mm f/1.8 II to the front of my 100 2.8 US macro and secured the whole thing with masking tape.
I'm still experimenting what settings work best, but I'm already amazed how high a magnification one can achieve with this technique!
SELF PORTRAIT AT THE TIP OF A BALLPEN - 7D + 37 mm ET + 100 2.8 macro (at f/11) + reversed 50 1.8 II (manually stopped down to f/2.8), 2.5 sec, ISO 400, manual exposure/focus, 455B/410 support.

SELF PORTRAIT AT THE TIP OF A BALLPEN - 7D + 37 mm ET + 100 2.8 macro (at f/11) + reversed 50 1.8 II (manually stopped down to f/2.8), 2.5 sec, ISO 400, manual exposure/focus, 455B/410 support.

UNCROPPED FULL FRAME RESIZED TO 1200X800 - 7D + 37 mm ET + 100 2.8 macro (at f/11) + reversed 50 1.8 II (manually stopped down to f/2.8), 6 sec, ISO 200, manual exposure/focus, 455B/410 support.

UNCROPPED FULL FRAME RESIZED TO 1200X800 - 7D + 37 mm ET + 100 2.8 macro (at f/11) + reversed 50 1.8 II (manually stopped down to f/2.8), 6 sec, ISO 200, manual exposure/focus, 455B/410 support.

100% CROP BEFORE NR AND OUTPUT SHARPENING - 7D + 37 mm ET + 100 2.8 macro (at f/11) + reversed 50 1.8 II (manually stopped down to f/2.8), 6 sec, ISO 200, manual exposure/focus, 455B/410 support.

100% CROP BEFORE NR AND OUTPUT SHARPENING - 7D + 37 mm ET + 100 2.8 macro (at f/11) + reversed 50 1.8 II (manually stopped down to f/2.8), 6 sec, ISO 200, manual exposure/focus, 455B/410 support.

SHOOTING THE TIP OF A BALLPEN. I reversed my 50 mm 1.8 II (I manually fixed the aperture at f/5.0, my presumed optical sweet spot of the 50 mm), then taped it to the front of my 100 2.8 USM macro. The minimum focus distance was circa 20-30 mm, and that results into unbelievable magnification. The lens combo was mounted on my 7D and all was supported by a 410 gearhead and 455B tripod. Lighting was available light coming from a window to the right.

SHOOTING THE TIP OF A BALLPEN. I reversed my 50 mm 1.8 II (I manually fixed the aperture at f/5.0, my presumed optical sweet spot of the 50 mm),
then taped it to the front of my 100 2.8 USM macro. The minimum focus distance was circa 20-30 mm, and that results into unbelievable magnification.
The lens combo was mounted on my 7D and all was supported by a 410 gearhead and 455B tripod. Lighting was available light coming from a window to the right.

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