Archived posting to the Leica Users Group, 2012/05/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Wed, May 16, 2012 at 10:10 PM, Frank Filippone <red735i at earthlink.net>wrote: > I was surprised that Leica provided a test image of the M9M with an orange > filter. I expected that the digital sensor would respond to filtration > differently than film. It does - the sensitivity curves of the CCD are very different to film (any film). > Maybe even requiring new filters to be > developed/used that did what the old Wratten series Y2, Or, K25 etc...... > sort of a look up table approach to digital Monochrome filtration..... > The current filters, however, work pretty much the same. > Has anyone seen some filtration comments on the M9m?. > This is already an area where it is being criticised, particularly about why you'd bother given the issue you raise below. > Clearly that at the time of exposure, whatever you capture on "film" is all > you can work with later post processing. So filtering to increase contrast > selectively ( for example ) per color is not available during PP?????? > No, but you couldn't do that with B&W film either. To do that you need a colour original. > Examples of what I was thinking: Increase the sky contrast to pop the > clouds: change the contrast of foliage relative to rocks of the same > (otherwise) exposure value: > This is why you need your filters. The sensor is slightly more sensitive to blue than other colours and outdoors a light yellow is recommended to make the output as close to panchromatic as possible. Marty