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.
The 9mm pistol is the most popular caliber pistol in the world, whether for personal, military, or law enforcement use.Also known as âthe 9mm lugerâ or âthe 9Ã19â, the 9mm pistol is also the best selling handgun caliber in the United States for many years.Great for self-defense, tactical purposes, or sport shooting, most 9mm pistols are easy to use, easy to maintain, and easy to conceal.efore we go any further, we should point out that the best 9mm pistol is the one each gun owner feels most comfortable with. Still, based on their price, performance, and how many of them are sold on a yearly basis, we have managed to put together a list with the top 10 best 9mm pistols in the world.