When attached to a lens having a focal length of F, a 1.4Ã TC results in an effective focal length of 1.4ÃF, whereas a 2Ã TC results in an effective focal length of 2ÃF. Thus, a 400mm lens with a 1.4Ã teleconverter attached provides the same magnification as a 560mm lens, since 1.4 Ã 400 = 560. Similarly, a 400mm lens with a 2Ã converter produces the same magnification as a true 800mm lens. For birders, teleconverters can be a godsend.
The best handgun for law enforcement is one which fits the individual user. It should have no external safety which makes for ease of use.Everyone gets all fired up over caliber and âstopping powerâ. There is no such thing as stopping power itâs all about shot placement.est Answer. The best handgun for law enforcement is one which fits the individual user. It should have no external safety which makes for ease of use. Everyone gets all fired up over caliber and âstopping powerâ.
FBI weapons  FBI now issue the Glock 23 to all Special Agents on graduation. Agents are able to purchase and carry the smaller Glock 27 (subcompact 40 cal.) as a back up.  â¦The most commonly used sub-machine gun is the Heckler and Koch MP5/10, the 10mm variant of the famous MP5  However the FBI issues all agents a 12 gauge shotgun and most agents are also issued an M-4 (.223).