On 17 Jul 2004 at 13:44, David Taylor wrote: > have been shooting istD since nov. 03 . > i hav e two spots that regularly show up in dark parts of images. one > is on the left center of frame , bright green, and the other is > right upper center, bright purple,. ..... > both are easily stamped out in photoshop, but is this normal? any one > else have bright chromatic spots appearing often in dark > parts of images? > jason the rep said to clean the sensor but that only seems to eliminate > the dusty grey build up .
Unfortunately I don't have to know David to tell that he shouldn't be offering advice. What you are seeing hot pixels, these are due to self excited pixels on your sensor and are nothing to do with dust. Dust specs show up as areas of dark when shooting at small apertures in good light. Having hot pixels is normal, it's the number and their sensitivity that's of concern. The Pentax *ist D has an integrated subtractive noise reduction function which will act to negate image noise generated by stuck/hot pixels for images made at shutter speeds of 1/4 second or less. It can be switched on/off so do check that it's on as it has no detrimental effects. Cheers, 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
