Gudge

Because it is reversible I had to make this in two parts. What you can't see in the picture is the barrel extending down past the gear a few mm. The gear is held onto a flange on the barrel by the vertical bolts. Not an issue with this design. The zoom collar on the lens only moves through about 90º, I just have to make sure that when the zoom gear is attached to the lens that the gap is opposite the gear in the housing to ensure the two will never meet.

Here's a couple more N120 examples; Canon 8-15 on the left and Sigma 17-70 macro on the right. The 8-15 zoom gear has two tightening screws because it is reversible so I can use it for the 8-15 with and without teleconverter. The rubber ring on the 8-15 is narrow and one central tightening screw doesn't work well with either configuration. I use one screw when shooting th 8-15 by itself, and the other screw with the 8-15 pluse teleconverter when the zoom ring is fitted in reverse.

I use a one part solution with a split. It's easy to fit on the lens and can be tightened up to prevent any slippage in use by using the captive nut and screw. Here's a couple of examples; N120 for Sigma 150 macro on the left and N100 for Sony 90. macro on the right:

Here's a Retra LSD that's been converted to have an iris disphragm: https://www.carousell.ph/p/retra-lsd-mia-snoot-with-manual-iris-aperture-1259838460/

I've been using one that is 2m long for years for this type of thing. I've never felt the need for anything longer.

95mm from the flange connection on the camera body to the end of the lens.

I've tried this with my Sony A7RIV and it works great in DX but there is vignetting in FF mode. First image is with my camera in FF mode, vignetting is most obvious in the bottom corners but is there in the top corners as well. Second is in DX mode and shows no vignetting.

By listing I'm assuming you mean camera settings, lens etc. Camera setup used was Sony A7RIV with Sony 90 macro in Nauticam housing, Nauticam EMWL with 160º objective lens and 2 x Retra Pro strobes. Settings used were: Shrimp on Nudibranch - f20, 1/60 and ISO 400 Coconut octopus - f16, 1/640 and ISO 400. I used high speed sync and backwards lighting to create the black background.

I can't decide which is my favourite from these two taken during my trip to Lembeh in July. Both taken with the Nauticam EMWL with 160º objective lens.

Here's a few of my favourite fish face shots.

My name is Ross Gudgeon and I live about 50km south of Perth, Western Australia. I've been diving and taking photos underwater since 1979.