10 hours ago, Dave_Hicks said:

My HF-1 beam restrictors, which can sit on top of a diffuser :

60mm

With 38mm option:

3D print shared at:

https://makerworld.com/models/865305

Very cool, Dave! You are definitely the master of printing that which others don’t make.

On 7/3/2025 at 7:45 PM, Alex_Mustard said:

This is how use them on Blackwater (no diffusers and no (option of) beam restrictors):

Hi Alex, I believe now you are always using MFO-3 in the blackwater, considering the focal area change, will you also change the strobe position a little bit or still keep the same as what you showed in this pic?

That photo shows my camera before a blackwater dive, but the strobes are not in their shooting position - they are in their carry to the boat position!

I generally shoot BW with the strobes pushed out wider than this, just in front of the port (as shown) and aimed in at around 45 degrees (again pretty much as shown). Ideally translucent subjects show up best with the light coming through them from behind, whereas more solid subjects show up better with more front lighting. This position is a good compromise for both (as a starting point).

When shooting the MFO-3 as a main lens on BW, yes, I would have the strobes a little further forward still.

Hope this helps,

Edited 16 hours ago16 hr by Alex_Mustard