User manual BUSHNELL DISCOVERER 78-1600

[. . . ] Afirm mount will also help you to locate, track and keep objects in the field of view. LENS SHIELD Unscrew and remove the lens caps from the objective lens and eyepiece. The objective lens shield may be extended by pulling it out from the end of the scope. FOCUSING The Discoverer used as a spotting scope will focus from 24 feet to infinity at any power setting with rotation of the Focus Control Ring. Make sure the Telephoto Adjustment Control is turned counter-clockwise as far as it will go. [. . . ] 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. Films with the highest ISO ratings are recommended. The faster the shutter speed, the sharper your picture. Mount the spotting scope on a sturdy tripod or shooter's stand. 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. Select the magnification and not f/stop as explained above. If, as in many cases the smallest f/stop shown on your light meter is f/45 and you need a reading for f/56 or f/64, refer to the Light Extension Scale or increase the ISO setting as previously explained. [. . . ] For more information, visit our website at www. bushnell. com Telephoto Accessories 22-3030 Discoverer Camera Mount 20-0003 Fits All AF & Non-AF Nikon Cameras 20-0004 Fits All Minolta MD Mount Cameras 20-0005 Fits All Canon FD Mount Cameras 20-0007 Fits All AF & Non-AF Pentax-K Mount Cameras 20-0010 Fits All Minolta Maxxum Cameras 20-0051 Fits All Canon EOS Cameras WARRANTY / REPAIR LIFETIME LIMITED WARRANTY Your Bausch & Lomb® spotting scope is warranted to be free of defects in materials and workmanship for the lifetime of the original owner. 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. [. . . ]