John E

Hi Sauther1, I also have an A7R V in Isotta housing. I also have the Canon 8-15mm, Sony 28-60 +WWL-1B and Sony 20-70mm (and Sony 90mm macro). Smallest for freediving is the fisheye Canon 8-15 with the small glass fisheye dome port and a small port extension. On its own with a Metabones or Sigma adapter you are using 15mm as a full fisheye (no usable zoom unless you use APS-C mode, which is still a good option if small system size is your priority). Isotta do a zoom gear for this set up. Next smallest is adding the Kenko 1.4 teleconverter and an extra 20mm port extension to get a nice zoom range. Isotta make a zoom gear for this with the Metabones or Sigma adapter. Both these are negatively buoyant if you are not using floats on strobe arms but not bad. Getting larger, the same lens can be used with the 8 inch acrylic port. This is almost neutral in the water with the dome slightly tilting upwards unless you add some weights to the dome shade. The Canon 8-15 plus 1.4 Kenko is what I use for snorkelling with wide angle. Another good option for wide angle zoom is the H59 B120 port which is made for the Nauticam WWL-1B with it's bayonet mount and the Sony 28-60 lens. . I use the Sigma MC-11 adapter for the Canon 8-15mm which does not have autofocus for video. This can be worked around with fixed focus (see the Backscatter video review on the Sony A7RV) but the Sony 28-60 and WWL-1B would be a better option than an adapted Canon 8-15mm if you are doing video. There are port converters to switch from Isotta to Nauticam. I don't know if these are usable with the Nauticam dry optics like WACP-C as these will be a few mm extra in extension due to the adapter, but the WWL-1B is supposedly same/similar optical performance to the WACP-C. I can't see the larger Nauticam optics being optimum for freediving! For rectilinear, I use the Sony 20-70 with the same extension and 8 inch done. Isotta also have a zoom gear for this even though it is not on their website port chart. Although not as wide as other options, those are covered with the zoomable fisheye. This still give a field of view as wide as the old Nikonos 15mm but also does decent larger macro, so it is a versatile option when you don't know what you will find. I also use this with a small arm and small single or double strobe (Inon s2000) for freediving. Lastly, there are lots of supported wider rectilinear lenses like the Sony 16-35 or Tamron 17-18 which would use the 8 inch dome or larger glass dome (not sure about the inconvenience of a 9 inch dome for freediving...). These are on the Isotta port chart on their website but they may also have other options for recently released lenses.

In Australia the price of the Photography plan (20GB) annual, billed monthly plan is changing from A$14.29/month to A$23.99/month.

I agree with Chris about fisheye lens positioning and port charts. Also, from what I can work out with my system, the Canon 8-15mm with the Sigma MC-11 adaptor and the Kenko 1.4x has a minimum focus distance of about 25mm from the front of the lens. With my 4.5 inch fisheye port and manufacturer recommended extension this puts the minimum focus about level with the glass. With the slightly longer extension that my "chessboard" test suggests, the minimum focus would be inside the port. So the port chart recommended extension is better for CFWA. Since this is an important aspect of this lens I believe manufacturers take this into consideration.

It's fantastic... so many great sequences. Thanks for posting. I also agree with you about colour. Not sure when you were there but the link below is interesting and writes about the coral bleaching in Raja Ampat in December. https://theseapeople.org/2024/12/18/coral-bleaching-raja-ampat/

My understanding is that compromises are involved, and with the Canon 8-15mm the perfect theoretical positioning does not necessarily line up with the best extension, depending on what type of photos you want and what dome you use. For close up wide angle shots, because the maximum effect is possible with a small fisheye dome, taking advantage of the minimum focus distance, and placing the dome closer to the lens, makes a big difference to the effect, creating a larger main subject and a better photo than having a longer extension which theoretically improves image quality but reduces the size of the central subject. For a larger dome, which is not ideal for close-up wide angle anyway, this doesn't apply.

Thanks Chris, it was small.. The bottom jaw does look a little bit long but that must be it.

This small flathead (?) was on shallow reef on the northern GBR. Any help naming it would be appreciated. Picture is with a Sony 90mm macro lens. Thanks.

Hi Adventurer, When you are referring to different wavelengths of light being absorbed at different rates it is obviously with distance travelled through water, nothing significantly to do with time.... as you say "speed of light in water is nearly identical for both wavelengths". So I can't understand how exposure time (shutter speed) could possibly make any difference to the relative proportion of different wavelengths of light reaching the sensor (i.e. colour). I use shutter speed to vary the deepness of background colour from pale blue to dark blue. I use Inon strobes and a Sony camera on auto white balance with white balance adjustment in Ligfhtroom. If I didn't use the warming diffusers it would be the same change in deepness of background colour but with slightly more green aspect.

This is a new BBC article regarding some survivors who were trapped in an air pocket for 35 ... hours. https://www.bbc.com/news/articles/cp3z0k72yw3o A Youtuber who reports on white-boat topics did a story about Red Sea dive boats recently ...

I also suggest the first step would be a small strobe like the Inon S-220 or used Inon S2000. Stepping up, a later TG model would have advantages, but best with decent lighting, so no loss in getting the strobe first. If you get more into wide angle , a big improvement on the TG cameras for wide angle also comes from using a wide angle wet lens to get to 130 degree field of view. After that, it is difficult to get a system that is as versatile as the TG for both wide angle and macro on the same dive. The Canon R50 in Nauticam is really interesting and possibly the best aluminium-housed enthusiast system, but you need the Nauticam wet lenses WWL-1B for wide angle and CMC close-up lenses to complete the system as the port is not interchangeable. Even then changing lenses mid-dive is not great in practice, especially swapping out a large and expensive wide angle lenses and carrying it whilst a macro wet lens is on the housing. This system would lbe really underutilised without strobes There is still an advantage to micro four thirds in the small lenses that are lower cost and readily available used, especially the Olympus 60mm macro. Olympus (OM System) OMD EM 10 iv in AOI housing, the OM1 in multiple brands of housing including AOI, or a used OMD EM1 mark ii or iii if you can find one. You could also use an Olympus with wet lenses (to swap mid dive from wide to macro) but also, if you don't mind committing to wide angle or macro beforehand, and since you say you are mainly interested in macro, Olympus with a dedicated macro lens sounds good.

I second what Chris says but I lean towards the AOI wet lens with their quick release bayonet for easy guaranteed compatibility with the port and your zoom lenses. My preference would be the one with the glass front element and collar. Although cheaper, the acrylic fronts are easy to scratch and cannot be polished due to a coating (unlike a normal acrylic dome). The cost of wet lens repair if a scratch does happen involves returning the lens for a new front element.

Maybe there are smaller diameter lenses that would be better for APS-C. One of the things I like about this lens with Isotta Sony A7RV is convenience since I can use the same extension and 8 inch dome port with the 20-70mm and the Canon 8-15mm plus Kenko 1.4 teleconverter. So this covers the field of view something like 35- 95 degrees then 125-170 on full frame without making any changes to the housing. On Isotta A6600 they have the 102mm port which fits the 20-70mm, Canon 8-15mm and 90mm. They don't have a A6700 housing but I hope they make one.

Sound like you have it sorted. Having one handle is a personal preference and what fits the particular housing, especially for a generic housing that may have a handle a little bit too far from the shutter release. Like you are doing ... easiest to just have two to start then see what you like.

Try both arms on one side like the second photo and just have them going over the top of the housing in an arch to keep the Stix floats centred for balance - and then have more range of movement when you take a picture. You may even prefer to only have one handle if you are going as small as possible, eg ditch the right hand one if the handle on the tray doesn't align well with the shutter release on the housing without a shutter release extension.

I know Nauticam sets the bar high but it would be great to have a comparison of sharpness and contrast (on full frame) of macro wet lenses around this strength and include lenses like AOI UCL-09PRO, Saga +15, Weefine+13/Kraken +13, and Inon UCL-67.