Life In The Seas Brain Coral



HomeGalleriesAbout George PerinaContactBuy ImagesGuide to Underwater Photography

     Digital Photography Basics
     Film vs. Digital
     Underwater Photography
     Underwater Housings
     Underwater Strobes
     50/50 Photography
     Tips and Tricks
     Care & Maintenance
     Suggested Reading
     Recommended Software
     My Equipment
     Useful Links


Part 2: Which Lenses To Use:  Wide Angle
There are a multitude of wide-angle lenses available, but the most useful in terms of utility are the super wide-angle lens. I'm referring to 20mm lens or wider.

Why a 20mm over, say, a 28mm lens? The first reason has to do with water magnification and the focal length multiplier of digital cameras (covered in
Underwater Housings.) 

If you're not shooting with a full-frame sensor camera, a 28mm lens effectively becomes a 50mm to 55mm lens underwater, depending on the multiplier factor. Gone is the possibility of panoramic "seascapes."  Even a 20mm becomes a 35mm to 40mm underwater, which is till somewhat limited for getting panoramic "seascapes."

Super wide lenses have four more advantages over conventional wide-angle lenses:

First benefit: Enormous depth of field.  Depth of field  is the area that is sharp before and beyond the actual focus point. As you stop down (use smaller f-stops), the depth of field increases.  Wide-angle lenses have inherently more depth of field than standard or telephoto lenses.

When I was using my favorite film camera combination, a Nikonos V and 17mm lens, my depth of field was approximately one foot to infinity at f22. In other words, I could focus on a subject approximately one foot away --and still see the entire background



                                         [ << previous page ]  [ next page >> ]

View Image Galleries
All images and content copyrighted George Perina and may not be used without consent.  Questions?  Contact me