presentations

Photo Talk – Aldridge Photo Club

I’m giving a talk tomorrow, entitled “Adventures in UK Underwater Photography”, to Aldridge Photo Club. If anyone would like to come along, you’d be welcome.

Aldridge Community Centre, Middlemore Lane, Aldridge, WS9 8AN. 7.45 for 8pm start.

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musings

Photosub judging

It has been my pleasure and no small responsibility to judge the work of the Photosub underwater photography group as guest of honour at their annual dinner, it was my task to pick out winners in advance from the four digital categories and on the evening from the print competition. Photosub is one of the oldest UK underwater photography groups and boasts a number of prominent UK underwater photographers. As a photographer it was humbling to pick out winners from such a high standard of work, but also a valuable experience to objectively critique the work of others. Thank you, Photosub; it was a pleasure to be the guest of such an active, passionate and talented group of underwater photographers!

Here I am with the competition winners.

dives

Salcombe Pea Soup

Sometimes called by divers “May bloom”, “snot” or terms less repeatable in polite circles,  there comes a time each spring in temperate waters when there is an explosion in the algae population. So it was in the Devon waters I dived with my club last weekend. Its not often a trip is a photographic washout, but my recent trip to Salcombe was almost so. Last time I went, early in April the water was clear (but very cold) and the visibility was excellent due to bright sun. That same sun, a few weeks later had caused the same stretch of sea (East Rutts) into murky pea soup, with countless green spheres in the water column from the surface to below 20m. Conditions were not helped by choppy seas and overcast skies. Still, a bad day’s diving is better than a good day in the office, as they say….

Red Fingers (Alcyonium glomeratum)
Red Fingers (Alcyonium glomeratum)
Hangin' out in the soup

dives, trips

Devon weekend

Oaten Pipe hydroids
Oaten Pipe hydroids
Sending up the shot
Sending up the shot
On the bottom
On the bottom
Waiting on the line
Waiting on the line

I greatly enjoyed a trip to Devon last weekend and, though the water was cold, the visibility was surprisingly good. I managed four dives- two reefs and a wreck (twice). The reef, East Rutts was a very pleasant place to spend an hour and this early in the season is covered in Oaten Pipe (Tubularia indivisa) hydroids. Those hydroids won’t be around for very much longer, as they are the food for nudibranchs (sea slugs). We saw many spiral swirls of eggs, but no slugs yet, but I would expect that by May the hydroids will be gone.

The wreck was called the Riversdale. It’s large and intact (except for the bow), with an impressive rudder and prop. It’s a while since I dived and took photos on wrecks at this depth (38m to the deck) and, photographically it was quite a challenge, due to the narcosis and the limited time. Even with good vis, lighting is difficult. We dived it twice, on consecutive days, as we could not get the shot line up after the first dive, so had to leave it in overnight and send it up on a lifting bag at the start of the second dive!

The vis was very good (about 8-10m), but I could see the beginnings of a “May bloom” of algae in the top few metres. Let’s hope that comes and goes quickly and does not spoil the view too much.

dives, musings

Stargazing

This hermit crab looks for all the world as if he's looking up at the stars!
This hermit crab looks for all the world as if he’s looking up at the stars!

 

On a recent trip to Scotland, we were dogged by poor visibility. This image of a hermit crab (Pagarus bernhardus) shows how much silt was suspended in the water. This site was actually one of the better ones (the shore of Loch Sunart, at a place called Camas Torsa) and I like the way the hermit crab seems to be looking up into a starry sky. I find hermit crabs endlessly entertaining and I have mused about them before, but it did make me smile. This particular individual had lovely iridescent hairs on it which have been picked up by the well-snooted strobe. I was shooting using the Nikon 60mm macro lens on my trusty D200. The critter was conveniently walking on an old crate in the water, which provided a fantastic stage from which I could take his portrait as he looked up and wondered if alien life existed out there…

equipment, techniques

Macro magnification

Having tried my lovely new Nikon 105mm macro lens out on a recent trip to Scotland, I had borrowed a Nikon diopter and also used a teleconverter. Now I had discovered that I was able to get some pleasing images, I was interested in making some measurements.

By using different combinations of these three items (lens, teleconverter and dioptre) different magnifications can be obtained, but as usual there are trade offs to be made. On one hand, a teleconverter increases magnification without needing to get closer (ie same working distance), but the optics absorb some light, which means either brighter illumination or a larger aperture, which in turn reduces the (already very narrow) depth of field. On the other, a dioptre lens increases magnification without absorbing so much light, but reduces the working distance.

So which is the best combination to choose? The first step, I felt was to try all the combinations and measure the magnification, working distance and depth of field. This would provide me with objective data to make decisions.

20140323-074655.jpg

It seems to boil down to working distance- the dioptre is likely to give better results if the subject is suitable- shorter working distance (so hopefully less backscatter) coupled with higher magnification. However, the teleconverter will help with more skittish subjects because it gives high magnification at a longer working distance, but relies on not having too much suspended matter in the water. Using both is a possibility, will require some care to ensure that the appropriate part of the image is in focus, due to the wafer thin depth of field.

musings

Photo talk: Adventures in UK Underwater Photography

UK diving 2013Tomorrow, I am giving a photo talk to Leamington Spa Photographic Society. I am to dispel a few myths about UK sea life and outline the challenges which face underwater shooters in our green waters. I hope that I can show some of my favourite images and compare the techniques beloved of underwater photographers with those used above water. Well, I trust the audience will still be awake after my two-and-a-half hours! Oddfellowes Hall, Leamington Spa, 7.30pm (Tue 26-11-13).