Proteus

Posting this over from the other site. NOTE: the price is now $800! The strobes are in good condition, function reliably, and have been diving as recently as last month. I purchased a used set of Retra's, hence the sale. The strobes come complete with the original boxes and literature, spare O rings and grease (never used), and mounting balls. Asking $800 USD for both and I will pay the shipping in the US. If I have to ship international, I'll add whatever it costs me and will work to find the best rate. I also have these posted over on eBay - US. If you buy there I'll make less, but I think the shipping is very easy for both the buyer and seller. Alternately, I'll probably ship international using US Postal, which is very reasonable. Note: One of the labels showing battery orientation is buggered up. You can see this in the photo. The label itself is damaged, nothing else. This occurred roughly 5 years ago when I got some water into the battery compartment. As you can see, I replaced the end cap (also was damaged) and have used the unit on many dives since then. Both upper and lower contacts are pristine, as you can see. NOTE: the screw on shades are also included. I wasn't using them when I took the pictures, but are in excellent condition and are included. eBay sale #: 116001392408

Over the last year I've followed several discussions about lens and dome / flat port considerations. I've tried to follow the details but the discussions are usually between members who know far more about this than me. They can assume "basics" that I just don't know. I'm hoping I can motivate a knowledgeable member to write an article about this. I know about, and have read into, various sites that have been referenced (such as Oceanity), but am hoping for something that would walk through a given lens, its placement with extension, and an ideal port determination. Topics, for example, could be: How to determine / estimate the lens entrance. pupil How the entrance pupil and minimum focus distance translate into an extension How example domes (maybe focusing on Nauticam) add XX dimension from their flange to the actual dome (interior?) surface. Information on dome curvatures and their intersections with the flange. How fisheye domes fit into all of this. Hopefully this makes sense, and apologies in advance if I'm already showing just how much I need to learn this. I know, from some past discussions, that manufacturers actually measure performance on a wet/dry fixture, but the calculation would be helpful as a starting point. Gary

Amazing, something I've never seen before ... and a beautiful composition. Wishing I had but a fraction of your skill. Gary

Thank you! I wasn't aware of how to do this and really appreciate the info. Gary

First, and most important, a huge thanks to the folks that created this forum. I am really looking forward to all the good things that will come from your work. Like all of us, I'm new to this site, but a long time member of the old site. I love UW photography (and have the all-to depleted bank account to prove it). I been diving for 38 years in all kinds of environments, with a special interest in wrecks, and have had my share of diving (and teaching) in both warm and cold waters. These days I'm retired and mostly interested in warm waters. You can find me off the North Carolina coast when I'm home, or most anywhere in the Caribbean throughout the year. Gary