On 3 Nov 2003 at 22:35, John Francis wrote: > Oops. Make that IR and near-IR, not UV. > > There is increased sensitivity into the UV, too, but that causes > things to look more blue, not more red. Proof-read more carefully!
If the *ist D is like most other cameras it will have a hot mirror (IR cut) directly in front of the CCD (which may also act as a anti-aliasing diffuser). I have seen a few web sites that test the effect of IR cut filters and most showed marginal effects. What can cause radical colour shifts in low light (particularly instances with low blue content) is electronic colour balance. When I'm shooting under tungsten or other low Ctemperature lamps I use a blue filter, of course it kills your effective ISO but there is always more blue channel captured and colours are more accurate. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
