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Perhaps, but the same can be said for any zoom lens and many people use them happily. IMO the entrance pupil location is most important at the widest setting, you are talking about using at 50mm or greater which would work behind a flat port. As far as I know all the port charts for zoom lenses are based upon positioning everything correctly at the widest setting.

PominOz! Love it! What a great User name Welcome. Great to have you with us on Waterpixels. We hope you really enjoy the forum. Best wishes from PominAMS. Tim

I have a rf 100 macro, basicly efs 60mm in canon r5 apsc = 96mm. That is not I want

Greetings members, introducing myself based in Sydney, Australia. I dive frequently in Indonesia and shoot a NA-R50 set up. Looking forward to participating in the forum and learning from you all!

EF-S 60mm macro will cover a FF sensor at maximum magnification.

Thank you for the reminder. I have checked his post. He used Ivanoff Rebikoff in combination with 24-105, not at dome port I once considered the EF 50 F2.5 macro, based on calculations, it fits perfectly with the 140 dome (telephoto end) without using an extension ring. However, the lens will protrude 22.4mm at macro, which will cause changes in the entrance pupil distance. I don't know if this has a huge impact on the image quality If measured by the entrance pupil distance, the change in entrance pupil distance for rf 24-105 stm will be greater

Just got back from Komodo. 1st trip with the Nauticam WWL wide angle lens. Performed very well.

You could try the 24-105 STM lens , it focuses very close about 0.2m, not sure if it's the same all through zoom range. It does get quite long so might hit the dome at the longest focal length. I seem to recall Adventurer likes it, he's posted about it on this forum.

Marelux and nauticam not recommend use rf 50 1.8，and this lens is external focus design, not like sonny and niko

MFO1, MFO 3 and SMC3 ❤️

Doesn't Canon make a 50 macro? That should work fine with a 140 dome. My Sony 50 macro is great with 140 dome.

Hello everyone, I previously used EVA Marine soft waterproof shell with RF24-70 in freshwater underwater photography. Although the edge image quality is poor, it can obtain some behavioral photos of sensitive organisms. Also, my luggage allowance is very tight, and it's a bit difficult to carry the flat mirror port I am looking for a medium focal length lens (50-85mm) that can be used behind a spherical mirror (140mm) on the Canon system with my fisheye lens. Currently, the closest focusing distance of Canon's RF50 1.8 and RF85 f2 exceeds 0.3m, and theoretical calculations show that they are difficult to focus with the 140dome without using an extension ring. If combined with a 30mm extension ring, I can‘’t be sure if better image quality can be achieved because there is no parameter for the entrance pupil distance for rf 50 and 85. Regarding other zoom lenses for RF, it is more difficult to meet the entrance pupil distance as the closest focusing distance is bigger. Do you have any good recommendations or experience sharing？ Thank you

Pretty beefy!

You perhaps misunderstood, the 16-45 is the lens that AOI and Nauticam and Marelux R50 housings are designed to use with the intention that the range is expanded on the macro end using various available macro diopters like the CMC-1/2 and on the wide end by the WWL-1 or the AOI UWL-09Pro. Both producing a wide 130 degree field and a huge zoom range. My lament was that had it been a 16-45 I could use the WWL-1C being slightly smaller than the WWL and the UWL-09. Of course the WWL-1C can still be mounted with the FOV limited to 118 degrees vs 130+.

haha sure. It’s something like this

@Nemrod Thanks! The 18-45 has never really been interesting to me, just seems not enough of anything with too much compromise on everything. It seems that this setup, with wet lenses, gives almost the lovely compactness of the TG but with definitively better images across the range. I'm particularly thinking of mid to wider shots where the TGs background gets a little icky (this is my biggest frustration with my beloved TG setup). The R50 option seemingly would eliminate that. I also saw that SeaFrogs has a little housing complete with interchangeable ports for the R50 - even a setup for the mighty EFS60 macro. So intriguing! So many gear options.

I'll be 75 in October and I'm still diving and taking pictures.

Looks interesting – especially since I'm having friction issues with my Saga Triple Flip Adapter when shooting vertically with the heavy SMC diopters. So, my question is: can the Marelux Triple Flip Holder hold the weight of an SMC2 in a vertical camera position?

I would like to see brightness measured as a ratio of center vs some standard degrees from center, like at 90 degrees to axis and 120 degrees to axis. Edit, I meant 45 and 60 degrees.

Many thanks! With that information and then finding out the distance from the front of the camera in the housing to the flange it will enable me to work out what port + extension rings if needed for any particular macro lens.

I think this was a massive amount of effort that Backscatter put into this report. It would be amazing if they kept adding new strobes to the matrix and turn this in a standing comparison tool. As of now they don't compare or contrast features like video lights, battery type, battery life, flood alerts, and price. These would be useful additions to complete the picture.

Today Marelux has announced the triple flip holder available soon for $399.00 in the US. Marelux Triple Flip Holder: The Ultimate Solution for Underwater Macro Photography Why the Triple Flip Holder is Essential A triple flip holder is a vital tool for underwater macro photographers. It mounts 3 different wet lenses simultaneously (such as +5, +10, or +15 diopters, or the newly introduced MV60 or MV24 wide-angle conversion lens). This setup gives you the ultimate versatility to switch between magnification levels instantly, or flip both lenses completely away to shoot through your native flat port with zero restrictions. The Flaws in Traditional Flip Holders Standard flip holders currently on the market suffer from two major design flaws: Corrosion and Jamming: Most brands utilize standard land-based mechanical designs featuring exposed internal springs and ball bearings. When exposed to harsh saltwater, these components inevitably corrode. Over time, the mechanism jams, requires constant lubricant sprays, and eventually fails completely. Lighting and Equipment Interference: Most holders offer only one standby position. If the lens rests at a strict 90-degree angle to the port, it blocks your strobes, which need to be tightly positioned near the macro port. If the lens flips beyond 90 degrees, larger and longer wet lenses can collide with your expensive camera housing or port, causing physical damage. The Patented Marelux Innovation Marelux is proud to introduce a patented design that permanently eliminates these industry-wide pain points: 1.O-Ring Sealed Lubrication Chamber: The rotating mechanism is housed in a fully sealed chamber, secured by precision O-rings and packed with liquid lubricant. Because saltwater cannot penetrate this boundary, the internal springs, bearings, and contact surfaces never corrode. It will never jam. 2.Two Instant Standby Positions: Switch between three secure holding angles in a split second. Use the active shooting position over the port, a 120-degree standby position for small, short wet lenses, to completely clear your strobe light paths, or an 90-degree standby position for larger, longer lenses, to safeguard your housing body 3.The left-side holder features a unique standby angle compared to the other two holders. This design allows users to mount larger wet lenses, such as the MV60 or MV24. While the second position uses a standard 90-degree angle, the first position is tilted slightly forward to prevent large lenses from colliding with the housing or macro port. Universal Compatibility The Marelux Triple Flip Holder is designed for maximum versatility across the industry. It is natively compatible with most major housing brandsfeaturing a standard M67 (67mm) threaded port. To adapt it to non-Marelux housings, simply remove the two anti-rotation positioning screws used for Marelux macro ports, and thread it directly into place.

For my flats ports it is the dimension from the inside of the port glass to the ports flange that sits against the housing. So my N85 flat port 45 is 45mm from flange to inside the glass.