Tom Kline

These time series images are priceless - having the dates on them especially. I think it is going to take a lot more of these to convince some politicians as well as the body politic.

I have used VEMCO acoustic tags in my past research. My guess is that the camera trap is triggered when a tagged fish swims by. BTW VEMCO had a diver-held receiver so one could visually confirm the tag was still in the live fish cf. in the stomach of a predator!! In my case I used stainless staples to suture the incision (where the tag was put in). The staple reflected a dive light rather nicely when we relocated the tagged fish while scuba diving.

The links are not links: Members 4 Posted Thursday at 12:26 PM I Googled "underwater camera traps" and this popped up: A low-cost, long-term underwater camera trap ... PLOS https://journals.plos.org › plosone › article › journal.p... by SM Bilodeau · 2022 · Cited by 13 — The DEAC camera trap design is a reliable, cost-effective, and easy-to-implement solution allowing the expansion of terrestrial camera trapping ... MantaID : LIDAR based underwater camera trap Ando Shah https://ando.xyz › work › manta-id The world's first underwater camera trap, designed to automatically capture the lives of manta rays and sharks.

I used the reflector on a single Retra (previous pro model) for most of my 105 shots from Palau in Feb 2023. Compared to many of the pix posted here I used slower shutter speeds to bring out more background. Because I am 4000 miles from the motherlode - I only have my website as reference. Many shots here https://www.salmonography.com/Marine-and-Freshwater-Biology/Palauan-fish-portraits/ There are some flashless shots as well as wide angle shots when I used a dome diffuser in this gallery. One can see a shadow in most of the reflector shots. One shadow looks more natural to me. The tiny circle with i in it will get you to the exif data.

I have shot several 100 thousand underwater images using just one strobe with the strobe at the 12 o'clock position. Here is an example: https://www.salmonography.com/Salmonid-Topic/Photography-techniques/i-xqzsjZ7/A Use the arrow keys to see more examples. Mostly used fisheye lenses. More recently (last 2 years) have been using the Nauticam EMWL lenses - first images in the gallery are the most recent. I do not think one strobe is much of a limitation!

I think we might be discussing two different phenomena here, one when the AF goes to sleep, as it were, and the other when it is totally kaput. When the AF of my 60 AFS died, AF never worked again but the rest of the lens functions were OK so it works as a MF lens.

Looks like a great idea. I bought white fins for the same purpose but they quickly got red stains on them when diving Hawaii. Plus forgetting to snap a pic with them in it. One trick is to have subjects that are not colored such as black or white. One can use the eyedropper tool to read the RGB values in LR and adjust the WB accordingly. Note that UW shots might look a tad more natural if the B value is greater than the R and G values. Try to get them closer to equal for subjects closest to the lens. I do this with salmon that are often black and white in the head area. For example adult Sockeye Salmon have a white lower jaw.

I still have a number of Inon Z220 strobes - now decades old. Never really warmed to the Inon battery compartment design that has not changed. Retras are much better especially the latest models IMHO. As well one has the choice of 4 or 8 batteries. Main disadvantage (esp with second gen Retras) is a dedicated fiber optic design as I use Seacam housings that come with electrical synch cords. The adapter (starting with gen 3) has one advantage and that is one can see if the cable is working by observing the disconnected adapter (one can also look for the light at the end of a FO but FOs are a tad fragile esp for my application so not so great IMHO).

I use the additional 4 batteries largely due to cold water. I have had the signal go from red to green on warming up after an overnight warm up at room temp. Now on holiday travel (first time since pandemic) - not able to use the new strobes due to weather prior to leaving. Merry Christmas!

The AF of my 60 AFS simply stopped working one day so I simply bought a replacement. It was then several years old - bought it right after it came out. My even older 105 AFS still works as new. I do not have an F4 to do the Rockwell test described above but am a bit surprised as the F4 has a very old AF system. I have used both AFS lenses housed under water without major issues for years. Though I have used a D3X and not a D3 per Rockwell.

Now on other computer - a bit challenged here!

It took a bunch of tries with 2 different computers but finallly got logged on! Admin you can ignore my quick note. Same person from wetpixel.