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HomeGalleriesAbout George PerinaContactBuy ImagesGuide to Underwater Photography

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

Lenses:

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

 

 

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