Stan Fayer wrote:
Shooting with my lumix 4/3 in monochrome is it best , or not , to shoot with a red filter, polorizing filter, to increase contrast or just do it post production
Polarizing filters are very useful in many circumstances. Filters are more flexibly simulated through post processing where anything is possible.
My Oly PEN F is particularly good at this. When shooting jpg +RAW I can have a viewfinder with a BW image and simulate ANY color filter including cyan to simulate orthochromatic film. My EM1 mark III is confined to the usual red, orange, yellow and green filters. In any case post-processing is super easy in most any program. OM workspace is rather good at this task and is free. Investigate the capabilities with your software. The channel mixer is a good option. With post processing you can always change your mind as to which filter is best.