LUCE DELLA FOTOCAMERA Luce anulare Weefine

archivio – Test subacqueiCAMERA LIGHT Weefine Ring-Light

Back in the day, newbie underwater photographers were often advised to start with close-up work. You could pre-set your camera and flashgun, so all you had to do on the dive was find a subject, frame it with the wire-framer supplied with your close-up lens, and press the button for nicely exposed, sharply focused pictures.
Qualunque altra cosa introduceva così tante variabili che il tuo tasso di successo veniva inevitabilmente ridotto, a volte fino a zero, finché non avessi acquisito una certa esperienza e competenza.

The biggest challenge in this has always been lighting. You generally need the camera so close to the subject that positioning one or two strobes to deliver even illumination is tricky.
On land, the ring-flash, a strobe with a circular flash tube that fits around the lens, has been an accepted solution for years. Now Weefine has a similar product for the underwater photographer, the Weefine Ring Light 1000, a ring-light that produces a continuous beam of light rather than a flash.

Il design
La luce proviene da una serie di LED disposti secondo uno schema circolare. Una punta adesiva a forma di L contiene la batteria, un tipo al litio 18650 ricaricabile. Basta svitare l'alloggiamento della batteria, il braccio lungo della L, per accedere alla batteria per la ricarica.
Batteria e caricabatterie sono entrambi forniti e, se rimani bloccato da qualche parte senza alimentazione, un adattatore fornito con la luce ti consentirà di utilizzare invece tre batterie AAA.
Sul lato dell'alloggiamento della batteria si trova l'interruttore di accensione/spegnimento. Tienilo premuto per alcuni secondi e la luce si accende o si spegne, oppure premi e rilascia l'interruttore per modificare l'emissione luminosa. Puoi scegliere tra le impostazioni alta, media e bassa.
The unit is completely self-contained, so once you’ve charged the battery and screwed it to the light, the unit simply screws to the lens-mounting thread on your housing or, as I chose to use it, to the front thread of an add-on macro lens. Thread size is 67mm. There are no other connections to camera.

Concentrandosi
Focusing is critical in close-up work, and the focus mechanism of the camera has only a small range in which to work if you use an add-on lens, so I quickly found a simple technique to get good pictures. The camera I used had a lens that could be zoomed from moderate wide-angle to short telephoto, so I first set the zoom to adjust the field of view, wider for bigger subjects, telephoto for smaller ones.
Then I found the subject using the viewing screen, not always an easy job, and moved the camera back and forth until the picture looked sharp. A half-press on the shutter-button fine-tuned focus, and then a final squeeze and the shot was in the Bags.
Then, and this is really important, I repeated the process. And again. When you’re shooting really small subjects, the slightest movement of the camera can alter focus and framing, so taking plenty of pictures improves your chances of getting something acceptable. And because this is a continuous light and not a flash, it doesn’t have the blinding brilliance of a strobe, so I didn’t feel uncomfortable taking repetitive exposures.

In uso
The first dive on which I used the Weefine was a Red Sea night-dive, and as soon as I was under water it was obvious that it was bright enough to be my primary dive-light. Bonus. And the battery delivered enough power to keep the light shining brightly for an hour and a half, after which it took around three hours to fully recharge.
Later in the week I used it on a Thistlegorm night-dive with a pair of dive-buddies who commented that the wide beam lit up the wreck very nicely for them, too. During the day it was still more than up to it’s job as a macro-foto light, even in shallow, brightly lit water.
After some trial and error I found that setting the camera to under-expose by two-thirds of a stop and then tweaking the image a bit in Photoshop gave me the best results. I was using a small-sensor compact camera, so depth of field wasn’t much of an problema, and was getting exposures of around 1/80 sec at f5.6 using ISO 200.
If you’re using a larger-sensor camera and need to stop down to get a bit more depth of field, to f8 or f11 say, you’ll need to up the ISO a bit to achieve a decent shutter speed, something that modern digitale will cope with extremely well.

Conclusione
La luce anulare Weefine è un kit semplice, ben fatto e facile da usare. Se ti piace la macro, vale più che il costo modesto.

SPECS:
TESTER: Mike Ward
PREZZO: £200
DIMENSIONE: 15 x 12 x 3cm
PESO: 375 g
VALUTAZIONE DI PROFONDITÀ: 60m
CONTATTO: weefine.com
GUIDA SUBACQUEA 9/10

Apparso su DIVER gennaio 2018

Il video del subacqueo che tocca lo squalo balena si traduce in una bella #notizia #scuba

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