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a long, powerful lens that will help you get that great wildlife or landscape shot you've always wanted. Why carry an additional long, photographic lens when this cost-effective item will allow you to use one lens for dual purposes?The focal length of your digiscoping combination is based on the focal length of your digital camera's lens while in use and the eyepiece's magnification. So if you were using a 100mm digital camera lens and a 20x eyepiece, the combination would produce a focal length equivalent to 2000mm. All ventures in the world of digiscoping require the use of a sturdy tripod, first and foremost. You must take great care to keep vibrations during exposure to an absolute minimum. Employing a cable release, electronic release or remote control for tripping the shutter is absolutely necessary. And while it is not necessary per se, the TSN-DA3 Mounting Bracket will do wonders to reduce vibrations of your rig.