Hi there Fred, if you are taking landscape pictures then there are some filters you may find essential/useful - Graduated Neutral Density filters will allow you to retain detail in the sky, when there is a big range of exposure between sky and foreground. You can buy circular mounts, or as I think, the more useful square/oblong filters such as Cokin, Lee Etc. these slide up and down a holder on the front of the lens and it means you can move them up and down to suit your image. Solid Neutral Density will allow you to use lower shutter speeds to get that milky effect on streams and sea. A polarizer ( Must be a circular polarizer for Digital ) - will cut down glare and reflections. Cokin and others make numerous different effect filters but I think these are the ones to start with. I use Cokin "P" size filters and for different lens sizes I use step up or step down rings to attach them. This is probably the cheapest way to get them. Neutral Density filters come in different gradations - from about 1 stop up to 8 stops. You will find you rarely - if ever - want the extremes - so I have a .3 and .6 which combined give me a .9. I find that the .6 is the one I use most here in the UK. When I was in France I used the combo most because the light was different. For Architecture your problem is different - external shots - use same as for landscape - for internal shots - learn to use the white balance on the camera ie: set white balance for tungsten, fluorescent etc depending on the internal lighting.
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