Outdoors
Outdoors,
explained.
Browse Outdoors guides from briefino.com.
Binoculars, explained.
Exit pupil is the objective divided by the magnification: Celestron publishes 5.25 mm for its 8x42 and 4.2 mm for the 10x42 on the same 42 mm lens.
Camping stoves, explained.
MSR publishes 3.5 minutes to boil a liter on the PocketRocket 2 and 16 liters per 227 g canister; the second figure is what sizes the fuel for a trip.
Camping tents, explained.
A tent carries two ratings: MSR states 1200 mm for the Hubba Hubba LT 2 fly and 1800 mm for its floor, because a sleeping body presses water through.
Headlamps, explained.
ANSI/PLATO FL 1 stops the run-time clock at 10 percent of the starting output, so a 625-lumen lamp rated 2 hours is not 2 hours of 625 lumens.
Hiking backpacks, explained.
Liters describe the bag and the load rating describes the frame: Granite Gear rates one 60-liter pack at 25, 35 or 43 lb depending on parts installed.
Hiking boots, explained.
Lowa's own size chart puts about 4 mm between half sizes, so foot length in millimeters, measured in the afternoon, decides the boot before any tread does.
Insulated bottles, explained.
Insulation hours are the maker's own claim: Thermos states 18 hours hot for its 24 oz bottle and 24 hours for the 40 oz, and the cap sets the hot rating.
Rain jackets, explained.
Mountain Equipment puts wind-driven rain at about 500 mm of pressure and sets its own fabric floor at 20,000 mm, so the extra millimeters buy margin, not rain.
Sleeping bags, explained.
ISO 23537 gives a bag three temperatures: Rab's Neutrino is comfort 14 °F, limit 0 °F, extreme −40 °F, and the name on the label is the middle one.