Phil Rudin

Hi Jack, I'll take it, can I Zelle the payment?

I use the Sony A7R V with a verity of lenses, ports, port extensions, strobes and more. Rather than doing all Math I just attach one or two of the Marelux 1500ml Flexibouys to my housing and make adjustments in the amount of buoyancy on the fly. They can be moved for landscape and portrait, added around extensions behind heavy lenses like wet lenses and have a verity of other uses. They are $40.00US each, light weight, pack flat and take up very little space. Just remember that they will tend to hold water so need to be drained when you exit the water.

Not sure of the relevance of the comparison between a 27.2 degree AOV lens and a 23.1 degree AOV lens other than they can both be used on the same Nikon Z cameras. It makes more sense to me to compare Nikon Z 105 to Nikon AF-S 105 VR. The upsides to the Tamron 90mm over the Sony 90mm are the more modern focusing motors that make the AF quicker and more accurate, 12-blade diaphragm for better sunstars and higher quality Bokeh at wider aperture settings, retail cost of $699.00US v. over $1000.00US for Nikon 105 Z and Sony 90 macros. Perhaps the biggest upside to the Tamron 90 that has not been pointed out in this post, underwater video reviews and more is the simple fact the the focus limiter has a big advantage over all the other Marco lenses I have reviewed. Every 1:1 macro I know Z105, FE 90, Sigma 105 and many more all have a focus limiter of 1:1 to 0.5mm or 19.69 inches. This does not cover the normal range that most macro photographers shoot at and therefore requires you to shoot from 1:1 to infinity for that extra few inches of distanceneededo for many subjects. The Nauticam MFO-1 helps to mitigate this issue by giving you focus for a little less than 1:1 out to between 1082-1002mm or 42.6 to 39.45 inches. This is great but most of use will never shoot a 90 to 105 macro lens anywhere near 39 inches from the subject. The Tamron has a focus limiting distance from 1:1 to 70cm or 27.56 inches, my guess is that about 95% of what we shoot without a closeup lens added will be within this range. The advantage for both the MFO-1 and the Tamron is far less hunting than at 1:1 to infinity. While the Tamron does not have the full advantage of the MFO-1 it has a far better shooting range that other macros starting from 1:1.

A great and reasonably priced lens. I also reviewed the Sigma 105 in the prior issue. They have become my go to pair. Have not used THE Sony 90 since I got the TAMRON.

Agree, no visible AF/MF switch and does not appear one would fit. According to DPReview staff at the CP+ show they have reported it is a MF lens.

I totally agree with Isaac that none of these measurements would be accurate enough to build a specialty lens like a conversion of the Nikon's RS 13mm. My measurements were more to demonstrate that within housing brands the distance will not be the same for all camera brands specifically the measurements Adventure was getting for Canon in a Marelux V. my measurements for Sony cameras in Marelux housings. Isaac, if you are located in the South Florida area I would be happy to provide some Marelux Sony housings for you to measure for your project.

Getting back to the A7C II/CR I now have the Marelux MX-A7CII/R housing in house and as you would expect it is a bit larger than the Nauticam housing due to the fact it uses the five inch (127mm) port opening rather than the NA-N100 port opening. I find the Marelux standardized ports and extensions to be an upside for switching between all systems and brands. Marelux offers a 32 flat port that works well with the Sony 28-60 zoom and wet lenses like the WWL lenses along with Port adapters to mount wet lenses like the WACP-C, WACP 1/2 and so on. I have attached photos of the front and rear along with shots of the back hinge and rotary locking system. This locking system reduces size and lowers cost to $2898.00 for the housing in black. This housing also allows you to use the FlashFuel system a combo of manual flash trigger and extended (over double) battery life. I see all sorts of debate over which strobes have the best battery life but the face remains that if you are using mirrorless cameras most strobe batteries way outlast the camera battery shooting stills and for video run time is also extended. I have added the 45 degree finder, vacuum system, and the LumiLink wireless flash trigger for the two Apollo S strobes (shown with the yellow color caps 4900K). LumiLink allows me to easily trigger two on housing strobes and two off housing strobes all at the same time without any additional slave units or long fiber cords. This is a feature that can be put to good use both for wide lenses or macro.

My plastic ruler is less than accurate and has a 6mm blank space but I took that into consideration when I made the posted measurements. What is most important to me is that I currently have three different Marelux housings in house for Sony A1, A7R V and A7C II/R and the cameras to match. Using my measuring device all three housings are the same +/- 0.2/3mm.

I will start over with this since the text and photos disappeared. This is a lot of do about not much to me. As you can see in both photos my measurement is identical +/- very little. First photo is the Marelux Sony A7R V housing and the second is the Sony A7C II/R housing. The Canon cameras are bigger and so is the housing, as a result the camera sits further back inside the housing. The only lens the Canon and Sony systems have in common is the Canon 8-15mm fisheye used in both Marelux housings with an adapter. The Canon camera needs a 30mm extension for 140 & 230mm dome ports in the Marelux housing while the Sony cameras use a 40mm extension for 140 & 230mm ports. The 10mm difference in extensions seems correct given the difference in flange distance.

The chart is I believe a measurement from the lens mount (not sensor) to the front opening (outside) of the housing. I don’t have a very accurate ruler but with the Sony housings it appears to be very close to the 43mm stated for Marelux on the chart. This has remained constant across at least seven MX housings I have used for several Sony cameras. I have handled several housings for Canon and Nikon at DEMA and all appeared to have the same distances.

Hi Bill, Not ignoring you just very busy. I will send a PM with some photos during the week.

Which one they made two?

Regarding the 16-25mm F/2.8 I have a custom gear and I have started with 55mm of Marelux extensions with Marelux 180mm dome. No results yet worth posting, only pool tests. Regarding the Laowa 10mm the 140mm dome is not ideal but works in a pinch where corners would have been soft anyway.

The big advantage of the 16-25mm over most of the Sony 16-35 lenses is the 18cm minimum focus distance v. most of the 16-35 lenses that are in the 25cm or greater range, Much better for use in a 180mm dome port.