Architeuthis

Definitely there is a reason. You want to take off the cap when you are UW and start to make photos. At the end of the dive, before you start going out, you mount the cap again to protect the precious wetlens (before you hand your rig to stuff on a zodiak). Domeports are mostly vulnerable in the short period when the rig is lying unprotected in crowded places while people enter/leave the water... In my case it is WACP-C, but the cap is very similar, if not identical. Similar to the others here, I have drilled a hole in the cap to mount a boltsnap via an accessory cord (redundantly secured with a cable ties). I mount the cap to a D-ring on my jacket and this is perfectly o.k. ... Wolfgang

I think the problem is not the optical quality of the Sony 2x TC, but the optical quality of the lens that is used together with the TC. The resolution/performance of a lens without TC may be o.k., but an excellent 2x TC amplifies the weaknesses of a lens without mercy, if such weakness exists... See e.g. here these test photos of both the Sony 70-200mm lenses (GM f/2.8 II and G f/4 II). At 200mm/f4 both lenses perform nice, but at 400m/f8 when the Sony 2xTC is attached, the IQ of the G f/4 II lens becomes really low, while the GM f/2.8 II is still acceptable: https://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx?Lens=1577&Camera=1538&Sample=0&FLI=5&API=4&LensComp=1662&CameraComp=1538&SampleComp=0&FLIComp=5&APIComp=2 It seems to me that the Canon 8-15mm is a high quality lens. IQ becomes a little soft together with the Sony 2x TC. Softness is, however, worse when I use the Canon 8-15mm together with the Kenko 1.4x TC (the non "HD" version). Also IQ of Canon 8-15mm/Sony 2xTC is comparable to WACP-C/28-60mm at the 60mm end (the 28mm end is sharper)... Wolfgang

Hi Martin, I have just bought the the Sony 1.4x TC for use with Canon 8-15mm in Nauticam housing and (mostly) 140mm dome (A7R5; have been using the Sony 2xTC&Canon 8-15mm now for two diving holidays (Croatia and Tansania) and it worked also nice (Image sharpness in center, more or less, comparable to WACP-C with Sony 28-60mm (both are, however, not "excellent"), corners similar. I do expect, however, better IQ with Sony 1.4x TC, therefore the acquisition of 1.4x)... The length of Sony 1.4x TC is 17mm, therefore an additional extension of 20mm should be perfect (in addition to the 30mm extension recommended by Nauticam; remember that Dreifish, based on the chessboard test, recommends 35mm instead of the "official" 30mm as theoretical optimum for the pure lens, w/o TC). The 3mm more, when the 20mm extension is used with the 1.4x TC, is fully in line with Dreifish's recommendation (alternatively one could use a 25mm (instead of 30mm)&20mm extension and this is probably also o.k.; I will be able to test the different extensions in the Red Sea only in March and can report afterwards (takeoff in 2_1/2 weeks 😋); I will also report my personal opinion, whether the switch to 1.4x TC indeed brings additional IQ and is worth (2xTC offers much better zoom range)... I have the Metabones V adapter and this works perfect with the Sony 1.4x TC and Canon 8-15mm. In case you have already the Sigma MC11 adapter you can test it out easily by yourself. In case you do not have an adapter yet, why not the Metabones V (at least theoretically, it should support AF modes a little better)? Wolfgang

I carry strobes with me in cabin lugagge, but Nauticam housing (in the travel bag) is checked-in in hardshell suitcase... Cabin lugagge, in my case, consists of Fotorucksack (approx. 10kg) plus Fotobag (approx. 4 kg). Just camera, lenses, flashes, Li+-batteries, dive computers, compass and travel documents. In addition, I wear a big "outdoor vest" with many pockets, just in case I would have to remove items from the Fotorucksack (never required, so far)...

The pulses, I guess, refer to electricity. The gas glowing in the flashtube will not stop emitting light inbetween pulses, maybe light intensity jitters a little at these extremely high frequency (remember the (rather slow) exponential decay of light intensity after a single pulse, shown sometimes here by our flash engineeres, who have the tools to record light intensity in time at high resolution))? In the end, a particle producing backscatter is illuminated by a flash pulse that lasts for 1/320s in HSS mode in your example. This compares to illumination by a flash pulse, lasting a little shorter than maximum shutter sync speed (depending on flash type and light strength selected), in normal flash mode. So the end result is expected to be pretty much the same...

I have just finished and printed an extension ring for the Nauticam zoomgear for the Canon 8-15mm fisheye lens with Sony 1.4xTC to be used via adapter (Metabones V in my case) on Sony cameras (A7R5)... After printing, I cut threads for three grub screws into the ring in order to fix it firmly to the Nauticam aluminium gear. Canon815_2xSony.stl

I find it difficult to find in the Internet a description how, exactly, HSS is working. Therefore my argumentation may have faults, but I can see none of them so far... According to what I was able to find out about HSS just now, the pulse frequency in HSS is mode is very high, up to 100 kHz, what makes the individual pulses merge and causing the flash to provide a single pulse, with, more or less, constant (but a little fluctuating) intensity that lasts for the duration of the entire exposure (=much longer than the shutter speed adjusted). => This would mean that in HSS mode the individual pixels are exposed to flashlight for exactly the time that is adjusted via the shutter speed. i.e. a single pulse ...

Who ever has come to this conclusions and what are the logical arguments behind it? Is there a single practical evidence on a real photo? HSS does not mean that a distinct region on the sensor is repeatedly exposed by the pulse of flashes, produced in HSS mode. Every single pulse of the strobe in HSS mode exposes a single, small region on the sensor and only once. The different regions of the sensor are exposed sequentially in order to achieve a shutter speed that is shorter than the "regular" flash syncronization speed, as the shutter is not able to syncronize the entire sensor region at once at a speed higher than sync speed (exceptionally fast sync speed is achieved via global shutter, as Sony A9III)... This means a single particle producing backscatter is exposed only once, is it in HSS or in "normal" mode. A photo produced in HSS mode should be identical to a photo produced by a single flash, when the flash is set to low power (providing short flash duration equivalent to a single HSS flash pulse)... => It is not visible to me how sequential flash exposure of different and consecutive regions of the sensor should give a different backscatter pattern, when compared to an exposure produced with a single flash... Wolfgang

Statistical comparison is NOT and NEVER can be relevant, when loss of human lifes are concerned - the safety standrards clearly should/must be better - no arguing and dot... Statistics is, however, relevant, when comparing the safety on liveaboards in different regions of the planet. I believe these standards are pretty the same and very low everywhere. Consider e.g. the terrible accident in California/US, few years ago, that costed the lives of approx. three dozends of divers (you can find a detailed discussion in Scubaboard). Somebody posted in Scubabordt a ground plan of the vessel: a common sleeping room for all (approx. 3 dozends) divers, double bunk beds in three etages, extremely obstructed. I believe such a boat would not have been approved, even in Egypt... => I just find it not fair when people are focusing now on Egypt, creating the illusion that liveabords are safer in other regions of the world... Wolfgang

Is there a solid statistical analysis available how the numbers (e.g. 16 boats lost in 5 years) compare to other regions of the world? I mean that one needs to normalize these numbers to the sheer number of diving vessels that cruise in the Red Sea - I guess the number of vessels cruising there is many hundreds - with the number of vessels that cruise in other regions (usually a few vessels per region - and also there boats are lost from time to time). Only then a comparison of the numbers of accidents makes sense... My personal observation is that the safety protocols in diving vessels are poor in Egypt, but I did not observe that these protocols are any better in other regions of the world (e.g. our Safari boat in Raja Ampat 2020 did not even have a second emergency exit from the lower deck in case of fire)... Wolfgang

It seems, after a period of deficiency, new UW strobes are sprouting like mushrooms: https://www.xadventurer.com/index.php?route=product/product&product_id=218 160 Ws, circular flashtube, 4800K, 7000 lumen video light (CRI90), Li battery pack, 150m depth rating

I fear the change of flight dates is a common issue these days... ☹️ Last November, on our way to Mafia Island/Tansania we had a similar issue with Turkish airline: The route was with Turkish airline from Vienna to Istanbul, Istanbul to Dar es Salaam and from Dar es Salaam to Mafia via domestic airline. I booked the first two flights as a package from Turkish and the domestic flight separately. Few days before departure, Turkish airline wrote me that the flight from Vienna to Istanbul was postponed for one day (but not the connection flight from Istanbul to Dar es Salaam, that was still one day before our arrival in Istanbul ...). I wrote Turkish airline bureau in Vienna whether they are crazy. The changed the scedule and we flew one day earlier (domestic airline and hotel were fortunately able to change the scedule accordingly)... => A lot of flurry, fortunately for nothing... => If possible, I book always via an agency as a package tour (would nor have been possible in this case), then the agency has to deal with these troubles... Wolfgang P.S.: When we were in Raja in 2020, we booked a package tour via agency (flight plus homestay plus safari) - no problems experienced....

Thank you for doing the measurement, Adventurer...👍 I do not understand what you mean with your last sentence: when a hemispherical dome as Nauticam 140mm is used and the entrance pupil is placed right at the center of curvature, there should be no vignetting - right? => When I use my Canon 8-15, Sony A7R5, Nauticam housing and 140mm Nauticam domeport with the 30mm extension recommended in the port chards, I cannot see any vignetting, neither with the 8mm circular fisheye image nor with the 15mm 180°diagonal image... In accordance no vignetting with Kenko 1.4x/2x or Sony 2x TC, when I correct for the length of the TCs by appropriate extensions... As a sidenote, there is a tread made by Dreifish, where he tested different extensions (in 5mm increments) UW. His outcome was that 35mm extension is optically even better than 30mm for the Canon 8-15, based on perspective UW/OW in split shots: I tested both 30mm and 35mm, but since I did not see a difference in IQ, I personally still prefer 30mm as the shorter extension is more convenient (with 35mm sometimes I could see part of the shade in the image, probably due to sensor IS and camera movement during photographing)... Wolfgang

Just in case you did not know so far, otherwise ignore: the Nauticam housings, as you buy them, usually have all the required electronics built in already. The only item required in addition is the mechanical valve plus the pump. When going for another vacuum system, one has to acquire another, complete, system. I would not bother to do so, I find this too roundabout (but I did not compare the prices, maybe one could save a few $$)... Wolfgang