B&W Contrast grades to Filtration Numbers

[PhotoBob]

Hi:
Does anyone have the colour combination numbers that correspond to the paper grades for the Bessler Dichro 45 computer colour head enlarger?
Thank you

 

[Marco Gilardetti]

Beseler, you mean? And for which brand/type of paper?

 

[Ronald Moravec]

Every pack of Ilford Multigrade has instructions and filter conversions.

Until you get the proper info, 30 cc magenta will get #3, 60 cc #4 etc. Yellow is about the same. You will need to increase exposure or use different combinations that add a lot of neutral density to maintain even exposures.

 

[Papa Tango]

Here are the equivalencies. Both filter arrangements lead to the same contrast grades, however the double filter system is intended to keep the exposure time and aperature the same across contrast grade changes.

MULTIGRADE EQUIVALENCIES FOR ILFORD RC
GRADE__SINGLE__DUAL
00_____200Y____200Y/0M (162)
0_______90Y_____90Y/0M
½_______70Y____78Y/5M
1_______50Y____68Y/10M
1 ½_____30Y____49Y/23M
2________0_____41Y/32M
2 ½_____5M_____32Y/42M
3______25M_____23Y/56M
3 ½____50M_____15Y/75M
4______80M______6Y/102M
4 ½___140M______0Y/140M (150)
5_____200M______0Y/200M

 

[PhotoBob]

Thank you all for the information.