Backscatter HF-1 Strobe Reduction Ring Set
with Macro and Super-Macro restrictors
This is an updated version of similar set I created last year. I decided to update and make it a bit more flexible, patterned loosely on the Retra design.
makerworld.com
There is a primary reduction ring that does not block the light path but slightly limits spread of the wide-angle beam. I've found this useful for reducing flare and glow with very wide-angle lens (fisheye, etc) in less than crystal clear water. You can add additional restrictors with 60mm and 38mm apertures. These are useful for macro scenes and help to limit illumination of background features.
The rings are printed with PETG. There are three TPU rubber parts that hold the rings in place. The largest is a Bumper than can be placed on the HF-1 permanently and protects the strobe from bumps and scratches even when not using the reduction rings. I wish I'd done this when I first got the HF-1s as mine are pretty dinged up on the leading edge. Two smaller rubber gaskets are stretched over the macro rings and provide enough friction to hold the rings in place securely.
Here is a comparison of the effects of the reduction rings. Shot from a distance of about 1 meter with a 15mm FE lens:
with Macro and Super-Macro restrictors
This is an updated version of similar set I created last year. I decided to update and make it a bit more flexible, patterned loosely on the Retra design.

Reduction Ring Set for Backscatter HF-1 Strobe V2 by awkward_swine MakerWorld: Download Free 3D Models
Boost MePlease Boost this design if you find it useful. Thank you for supporting my 3D printing hobby and sharing your enthusiasm.This is a major revision of an earlier Reduction Ring set design I created for the Backscatter HF-1 Strobe. Reduction Rings are useful to reduce and narrow the spread...

There is a primary reduction ring that does not block the light path but slightly limits spread of the wide-angle beam. I've found this useful for reducing flare and glow with very wide-angle lens (fisheye, etc) in less than crystal clear water. You can add additional restrictors with 60mm and 38mm apertures. These are useful for macro scenes and help to limit illumination of background features.
The rings are printed with PETG. There are three TPU rubber parts that hold the rings in place. The largest is a Bumper than can be placed on the HF-1 permanently and protects the strobe from bumps and scratches even when not using the reduction rings. I wish I'd done this when I first got the HF-1s as mine are pretty dinged up on the leading edge. Two smaller rubber gaskets are stretched over the macro rings and provide enough friction to hold the rings in place securely.
Here is a comparison of the effects of the reduction rings. Shot from a distance of about 1 meter with a 15mm FE lens: