nie mam wbudowanej lampy, obudowa, ktora chce kupic, posiada mocowanie na dwie zewnetrzne lampy, usytuowane po bokach aparatuZamieszczone przez Borek
cytuje za www.seafriends.orgNo i jeszcze trzeba pamiętać, że zanurzenie obiektywu wydłuża ogniskową (ze względu na współczynnik załamania światła na granicy woda/powietrze). OIDP z 35 mm robi się mniej więcej standard. To może oznaczać kompletną porażkę - lustrzanki cyfrowe i tak już pozornie przedłużają ogniskową, jak jeszcze wejdziesz do wody ze standardu zrobi się miły obiektyw portretowy circa 105 mm
Lens types
lens types comparedCamera lenses are available in a continuum of focal lengths from 16mm to over 100mm (for 35mm cameras). But the practical range for under water is 13mm to 100mm. The super wide angle 13mm lens has good depth of field but is not able to take fish portraits. For sharp macro photography often a 100mm lens is used. The table compares the properties of wide, medium and tele -angled lenses.
In general, the 13-20mm lens is for people, large animals and seascapes. The medium angle lens is often a 28-80mm zoom lens, most suitable for fish photography and close-ups of people. The tele lens is often 60-100mm and is good for macro photography and detailed fish portraits or small animals.
The wide angle lens distorts the real world as if there is more space. Objects seem farther away. It creates a lot of emptiness and should be used with care. By contrast, the tele lens makes objects seem stacked closer together. Both lenses introduce new creative possibilities and surprises.
So what is the work-horse of lenses? It depends what you are after. In general the super wide angle lens (13-16mm) is difficult to use although it gives surprising results. You have to combine it with a super-wide strobe light and long strobe arms. The lens looks at the sky and at your fins all at the same time, introducing very high contrast. To counteract this contrast amounts to a fine art. But if you want to photograph reflections in the surface, the snell's circle, cathedral light, models and sea mammals you can't do without it.
The medium focal lenses of 28-35mm tend to be good work-horse lenses, but for some reason (price?) they do not have a wide focusing range. I find the 50mm macro lens also very productive because it allows one to keep some distance from fish and without changing lens, focus down to 15cm.
A note on macro photography
The macro tele lens with or without close-up attachment lenses, places the camera at a sufficient distance from the object to allow the strobe light in. A macro lens is able to focus over a range of 5 diopters (from infinity to 20cm), whereas a standard lens would range over 2 diopters (from infinity to 50cm). With a closeup attachment lens of 2 diopters, the focal range would reach from 50cm to 14cm for the macro lens and from 50 to 25cm for the standard lens.
As far as depth of field goes, it would be better to use a medium angle lens (35-28mm) with extension tubes, such as offered for the Nikonos cameras. A 28mm lens has 16 times the depth of field of a 100mm lens but would need to be placed very close to the subject.
Note that the Nikonos lenses are corrected for the frontglass effect, and deliver very sharp images under water (but less so above).
Nikonos to standard, legenda........niestety cyfrowa rewolucja pozera legendy...... ciekawi mnie jak sie 5D zachowuje pod woda........ uzyteczne, wysokie iso, przyzwoity autofokus...............rezultaty powinny byc ciekawe
Borek, a co jest najbardziej istotne w fotografii podwodnej ??
A mozesz nie wku...... takimi ciekawostkami, ataku serca dostane :-D
Piekne..........................
Odpowiedz z cytatem
No ale zdarzają się i perełki 
