Phil Rudin

It has an A setting on the aperture ring allowing it to be controlled from the camera.

All modern strobes, if you go back decades perhaps not. I think it would be a little presumpus to say every single strobe.

I was advised today that this TTL trigger works with most all TTL strobes.

I would not recommend the Sony 20-70mm behind a flat port because other choices are so much better. I have tested the Sony FE 28-60 with the flat port using CMC-1 and two CMC-1's stacked. Remember the 28-60 only focuses to 30cm with 1:6.25 magnification so the added closeup lenses only get you to about 1:2.5. If you are looking for more magnification than the 20-70 or Sigma 20-200mm give you the macro range of lenses are a better choice with the Sony FE 100mm F/2.8 being the best followed by the Tamron 90 and Sony 90mm's. Regarding the Sony FE 50mm macro now well over a decade old my recommendation would be the Marelux MV-60 or if you want everything Nauticam the MFO-3 on a flip adapter for both super macro and wider on the same dive. The MFO-3 works from 0-150cm while the MV-60 works from 0-infinity, the reason Tom Kline got his for the added distance.

This lens is now available in the online store for $449.00USD. Christopher Frost has posted a Youtube review and states the corners are better from around F/2.8 to F/11 than the manual FF version he tested. No way to mount filters but overall not bad for the price.

Yes If you are using it in one of the listed housings.

Like the triggers from UWT and Turtle the Marelux flash trigger is designed for the most current Marelux housings and Marelux line of strobes. This current version does not support the HSS function in the Apollo strobes. The trigger is fast enough to shoot at 20+ frames a second and it is a plug and play configurations.

The photos are with the Sony FE 20-70mm F /4. I now have a 180 port in house and will be testing the Sigma soon. The OM 12-45mm F/4 is a 1:4 lens so about the same as FF at 1:2.

Hi Fred, I have been following your quest for useful insight and this is my take. Most fish are larger than 1cm and will fit into a 1:2 minimum focus distance frame. The 90-105mm macro lenses are most useful for images from the minimum 1:1/1.4:1 hangout to about 1:6 before you are putting to much water between the lens and subject, vis is a contributing factor in some cases. So while I wholeheartedly endorse the Sony FE 100mm as the best macro lens on the planet, (I have one with 1.4 & 2X tele converters) I believe you have a chance of a wider range of subjects with a zoom lens. The attached photos were taken with the Sony A7R V in Marelux housing with the Sony FE 20-70mm F/4 lens using a 180mm dome port. This lens has a 1:2.56 minimum magnification. The camera is 61MP so cropping is no problem for your use I would think. Marelux and Nauticam both support this lens with a zoom gears. Marelux uses an extension ring 50 and Nauticam uses the N100 to N120 35.5 port adapter II and extension ring 35 with the 180mm port. This is a $1200.00 Sony lens. With this lens you would really shoot at less than about F/8/F11. While I have been very happy with the Sony 20-70mm when I know I will be dealing with a verity of subjects sizes I have now found what I consider to be an even better mousetra, the Sigma 20-200mm F/3.6-6.3 DG a $900.00 lens. This is a lens that at this time is only supported by Marelux with a zoom gear. What makes this lens unique is that it focuses to 1:2 from 28 to 85mm behind the 180mm dome and can extend out to about 130 to 150mm before it quits focusing because it gets to near the dome glass. Additionally the Sigma will stop down to F/40 in the macro range. My guess is that I am older than you Fred and I have been using the Sony A7R VI, A1 II and A7C both II and R all with Marelux housings and dual Marelux Apollo S and Apollo Y TTL strobes. Like some other strobes in the market these include HHS which solves the /1/160th sync to a degree, TTL, and multi frames settings. If you decide to go with the A7C II/R I have a like new Marelux housing and very low milage A7C II and A7C R camera bodies for sale.

Today 7Artisans has announced on its Facebook site that the AF 10mm F/2.5 MAX fisheye will be released on August 27/GMT+8 for $449.00USD. The post does not indicate if the lens will only be sold on the & artisans site or if it will be in online stores like B&H Photo.

Marelux lists the RF 20-50mm PZ on the Aquista 135D lens chart with a zoom gear (#51211) and an extension 30, so zoom range from 28mm to 50mm. I don't see the lens on the port chart yet but my guess is that the extension 30 with a 180mm dome port would be a good starting point. As a side bar, Marelux has also added the new RF 7-14mm fisheye zoom with zoom gear #51210 and extension ring 30 with the 140mm dome port with bayonet dome shade.

Thanks Davide but I still believe in written reviews, not chat GBT and most of these companies are looking for YouTube talking heads.

The new 7Artisans full frame AF 10mm is an F/2.5 MAX fisheye lens. MAX seems to be a new line of high end lenses that have aperture rings, function buttons, weather sealing and more. This is one of the worst lens rollouts I have seen in some time. No information released in English, no lens reviews found on Youtube in any language and no updates after being announced in China. Further the lens in Sony FE, Nikon Z and L-mount was listed on B&H for close to three weeks with a notation that B&H was waiting for a price and release date so they could take pre-orders. Two days ago the lenses were removed from the Q and are no longer listed on the site. Not a good start after all the hype 7Artisans had gotten.

Marelux has the Canon 7-14mm fisheye listed on the port chart with zoom gear #51210 and extension ring 30 for the 140mm dome port.

I think the Tamron 12-20mm will be well suited to U/W work simply because at 12mm if will focus to 18cm. With the proper extension it should work well behind domes in the 200mm and larger range. This is not the case with lenses like the Nikon Z 14-24mm F/2.8 and Sony FE 12-24mm F/2.8 GM that only focus to 28cm. Another excellent very wide lens is the Laowa 12mm F/2.8 AF for FE & Z. This lens will focus to 14cm and is usable behind a 140mm dome with proper extension. This lens is much less expensive than the 12-20 at $699.00. If you want a less expensive fisheye that natively mounts on Nikon Z checkout the 7Artisans 10mm f/2.5 AF MAX Fisheye Lens (Nikon Z).