Category: Orchid Doctor

FOOT-CANDLES READING: Using a Built-in Light Meter in a Camera

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Set the speed dial at ASA25 and the shutter speed at 1/60; aim camera at center of sheet of paper eight inches by eleven, eight inches distant; the lens opening (f-stop) is adjusted until the meter... Read More

FOOT-CANDLES READING: Using Exposure Meter

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Set ASA at 10 and exposure at 1/100 second; hold the meter pointing at the center of clean white surface as closely as the smallest diameter of the surface(such as paper) casting no shadow and read... Read More

FOOT-CANDLES READING: Using Photographic Equipment

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Use the meter on the camera; point latter at center of sizeable white surface without casting a shadow; set ASA at 10.3 and the shutter at 1/100 second and read: f/3.4 is 400fc.; f/4 is 500fc.; f4.... Read More

FOOT-CANDLES READING: With Photographic Light Meter

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Meters can be bought for reading foot-candles; with a Weston photographic meter convert to fc. by measuring light reflected from a piece of white matte paper and multiply the light value by four. A... Read More

FOOT-CANDLES: Conversion Table

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Using a Weston light metre and a sheet of white matte cardboard, take exposure readings and rate them with foot-candles of light 16(6400), 15(3200), 14(1600), 13(800), 12(400), 11(200) etc. down to... Read More

FOOT-CANDLES: Fc Rating Meaning

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago One foot-candle equals the light emitted by one candle one foot away; expressed ratings are measured at noon Standard Time on a clear day; the maximum amount would be recorded around June 21 and th... Read More

FOOT-CANDLES: Interpretation of the Meaning

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The recommended foot-candles of light for a species means the direct or incident light. A64-975 Read More

FOOT-CANDLES: Light Intensity Required by Plants

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Cattleyas:2500-3500; dendrobiums: 1500-2500; miltonias: 800-1200; odontoglossums:800-1000; phalaenopsis: 800-1200. 0R81-112 Read More

FOOT-CANDLES: Meaning

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago The amount of light emitted by a burning candle one foot away; 500fc. is about enough to read a newspaper; a clear day in June (in Maine) would be 12,000. A86-814 Read More

ACID OR ALKALINE: Changing the Values

Author is Robert M. [Bert] Hamilton (Compiler), posted almost 8 years ago Various means can be used: tufa, a limestone form, can be added to paphiopedilums from limestone cliffs; bark composts acidify with age; peatmoss, pine needles, oak leaves in the mix produce acidit... Read More