from the camera, the proper focus for the lens-plus-dome was in the close-up 

 ranges, such as perhaps 1 ft. 2 inches. What we needed to know was the rela- 

 tionship between the various diameter domes and changed focus distances. 



EQUIPMENT 



The following cameras were tested: 



Cameras Tested 



1. Kodak Instamatic Model 174 camera, in a Sea Research and Development Co. 

 plexiglass housing, with a flat-port. 



2. Kodak Instamatic Model X-45 camera, in an Ikelite cast-Lexan housing, 

 with a flat-plexiglass port. 



3. Ricoh Hi-Color 35mm camera, in the Ricoh Marine Capsule, plastic housing, 

 with a flat-glass port. 



4. Nikon model "F" 35 mm camera, in a Schulke plexiglass housing, with a 

 dome-port, 6 inches diameter (Danforth-White compass cover) . 



li 



Nikon model "F" 35mm camera, in a Sea-Glove cast-Lexan housing, with a 

 dome-port, 5 inches diameter. (Danforth-White) 



5B. Nikon model "F" 35mm camera, in a Sea-Glove cast-Lexan housing, with a 

 flat plexiglass port. 



6. Nikonos 35mm Underwater camera, with 35mm Nikkor Lens, and UW corrected 

 28mm Nikkor lens. 21mm lens with a 3 inch dome-port. 



7. Nikon model "F" 35mm camera, in an Ocean-Eye housing, with a dome-port, 

 8 inches diameter. (Dome supplied by Ocean Eye.) 



8. Nikon model "F" 35mm camera, in a Nikko-Mar II housing, with a dome-port, 

 8 inches diameter, (Danforth White). This dome had been attached to 

 housing by Flip Schulke. 



Lenses for Nikon - "F" 



1. 20mm Nikkor, F 3.5 



2. 24mm Nikkor, F 2.8 



3. 28mm Nikkor, F 3.5 



4. 35mm Nikkor, F 2 



5. 50mm Nikkor, F 2 



Dome-Ports Tested 



1. 3 inch Hemisphere dome-port. (Replacement compass cover, Ritchie Pilot 



compass-Plexiglass .) 



2. 5 inch Hemisphere dome-port. (Replacement compass cover, Danforth-White 



compass-Plexiglass.) 



VI-297 



