Dual Band ( DB ) Photography is probably the most recent exciting medium to work with in the field of Photography,  very little has been published about it,  however a considerable amount of material is available on Infrared including some of my own offerings.  DB is basically another form of IR photography but it includes UV and Vis to colour the image up and produce varying degrees of effect,  good or bad.  To properly get to grips with DB you need to be reasonably proficient using a DSLR to get your head around this new technique and your Bank Manager will also need a sense of humor to go along with you.  Having stated the obvious you then need to orientate yourself towards Invisible light Photography and also to be able to recognize where your sources of radiation are coming from,  well the Sun is the most obvious source of radiation,  but what about other sources,  well that could be difficult to decide because you cannot see it but it does exist,  how can you overcome the problem of hot spots and determine what really is HOT.   Probably sounds confusing but lets assume that the Sun is the largest single source of radiation available,  what other sources are there,  well we have the humble incandescent bulb or tungsten bulb which is now frowned upon for energy purposes,  hey but never mind...bugger the Mercury in fluorescents,  they got the thumbs up.  Switch on a tungsten light and you can almost hear the IR screaming out at you,  turn on a fluorescent and you are looking into a black hole,  and to complicate matters further how do street lights and exhibition lighting affect image making.  Well your best bet is to get yourself a meter,  if you were shooting with Vis then you would have no problem but IR and DB are different,  well you could always take a shot but that may not always be convenient and you have no way of measuring individual levels of radiation,  well lets put this one to rest ..... you cannot buy an IR meter .... LOL.  You can if you wish make one for about 25.00 using a conventional LUX meter by replacing the internal hot mirror ( Greenish Glass ) with an external IR filter,  then you can measure IR levels easily and you will then be able to get a better understanding of what is happening around you.

Light is measured by it's wavelength on what is termed Nanometers or NM.  Converted cameras with a Specrosil 2000 filter will admit light from 170nm upwards all the way right up to the start of the IR spectrum of about 700nm and way beyond.  Levels beyond 950nm are rarely used in this type of photography and even slow things down considerably,  I prefer an 850nm IR filter for Summer use and will drop to 760nm for Winter.

Understand this and you are on your way to becoming a good Photographer..................




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