User manual BUSHNELL DISCOVERER 78-1600

[. . . ] With the Discoverer, the user can scan an area with a wide, bright field of view at 15 power and instantly zoom in for breathtaking 60 power close-up. The Zoom Power Control Ring smoothly increases or decreases the magnification as desired. The exterior body contains a unique rubberized surface providing durability, noise reduction and a non-reflective surface. The following directions should be followed closely to assure sharp clear observations. [. . . ] All magnifying optical instruments show a decrease in image brightness as magnification is increased. 3. After setting up, locate the subject through the camera's viewfinder in the usual way with the spotting scope at it's lowest magnification. Once located, you can frame the picture as desired with the Zoom Power Change Ring in the same manner as when using it as a spotting scope, then use the focusing system of the spotting scope to bring the subject into sharp focus. Minimum focus distance as a telephoto lens is 80 feet. ZOOM TELEPHOTO LENS ADAPTATION FOR SINGLE LENS REFLEX CAMERAS WITH REMOVABLE LENS Spotting Scope/Telephoto Adjustment Control Telephoto Guide 35mm SLR Camera Telephoto Camera Mount HOW TO USE YOUR DISCOVERER AS A 1000MM TO 4000MM ZOOM TELEPHOTO CAMERA LENS With the addition of 2 inexpensive accessories, the Discoverer will attach to a 35mm single lens reflex camera that has a removable lens. It then becomes an integral part of the camera's optical system and functions as an extra powerful zoom lens. The two accessories needed for this are; a #22-3030 Telephoto Camera Mount and a Camera Body Adapter that matches your particular camera (see listings under accessories at the end of these instructions). Turn the spotting scope's Telephoto Adjustment Control Ring clockwise all the way until it stops, then screw the Telephoto Camera Mount over the eyepiece. Screw the Camera Body Adapter to the other end of the Telephoto Camera Mount. Remove the standard lens from the camera and attach the body to the Camera Body Adapter. A car window mount is also available but it is recommended that the camera not be operated while the car motor is running since the slightest tremor at even the spotting scope's lowest magnification can ruin image sharpness. Shield the scope from wind as much as possible and always use a cable release or the camera's self-timer to make an exposure. Camera Body Adapter LENS CHARACTERISTICS Coupling the spotting scope to a camera creates a completely new lens system, the essential characteristics of which are controlled largely by the scope-with one exception: the Discoverer does not incorporate a variable aperture (f/stop) control. In this new system, each of the scope's 7 power settings has its own effective f/stop as shown on the Telephoto Camera Mount, and any increase or decrease in the amount of light transmitted to the film at any one power setting must be made by a change in the camera's shutter speed. HOW TO DETERMINE SHUTTER SPEED The following reference chart can be used for shutter speeds only under bright, sunlit conditions. If your camera's shutter speeds do not match these calibrations and if the difference is very slight, the next higher speed indicated on your camera's dial should be used. Underexposure in both black and white, and color film (particularly color film) is recommended. CAMERAS WITH BUILT-IN METERING SYSTEM Set the camera's film speed dial to the ISO rating of the film being used. Turn the Zoom Power Ring on the spotting scope to the desired magnification (telephoto effect) and check the chart printed on the Telephoto Camera Mount for matching f/stop, determine the shutter speed in the usual way. If the camera's meter will not give a reading, increase the film's ISO setting until it does. Remember to make a note of this higher setting - the laboratory will need to know it when you bring in the film for processing. Also keep in mind that all subsequent pictures on the same roll must be taken at this same ISO rating - roll film cannot be processed by individual frames. (Continued on page 3) 2 Power 15x 20x 25x 30x 40x 50x 60x Approximate Focal Length Or Telephoto Effect 1000mm 1400mm 1700mm 2000mm 2700mm 3400mm 4000mm Approximate Effective f/Stop f/16 f/22 f/28 f/32 f/45 f/56 f/64 Approximate Shutter Speeds 1/200 1/500 1/125 1/200 1/60 1/125 1/60 1/125 1/30 1/60 1/15 1/30 1/15 1/30 NOTE: Using any other f/stop other than f/16 may produce a dim image. CAMERAS REQUIRING EXTERNAL METERING DEVISES Set the light meter's ISO index to the rating of the film being used. [. . . ] The Lifetime Limited Warranty is an expression of our confidence in the materials and mechanical workmanship of our products and is your assurance of a lifetime of dependable service. In the event of a defect under this warranty, we will, at our option, repair or replace the product, provided that you return the product postage prepaid. This warranty does not cover damages caused by misuse or improper handling, installation or maintenance of the product. Any return made under this warranty must be accompanied by the items listed below: 1)A check in the amount of $10. 00 to cover the cost of handling 2)Name and address for product return 3)An explanation of the defect 4)Product should be well packed in a sturdy outside shipping carton to prevent damage in transit and return postage prepaid to the address listed below: IN U. S. A. [. . . ]