Contrast filters and Dichro 67 megenta wheel

[ToddB]

Hey guys,

I use a Besler Dichro 67 enlarger for my 35mm film images to enlarge. I was wondering if there is a percent equivilant on the magenta wheel that would be the same as the contrast filter? IE 25% would be the same as a #2 filter contrast filter, ( just guessing).

Todd

 

[MattKing]

From the Ilford website - the data sheet for contrast control for Ilford Multigrade papers: http://www.ilfordphoto.com/download.asp?n=782&f=2010628932591755.pdf

See the tables on page 3 - use the Kodak numbers for Beseler color heads.

 

[RobC]

not sure exactly what you're asking. Where a head has single dial for contrast settings it is usually combining both Y+M to give for example G2. So if you are using just 25% M then I don't think it will match exactly without testing it. Infact G2 is around zero filtration or a combined Y+M so I doubt there is a direct match of 25% M only giving G2 or a match to a combined Y+M value for G2 (except zero M+Y).

If you are thinking of filters such as the ilford filters then you should know they are a combination of Y or M plus some neutral density so that they are speed matched. So if you are using 25M your will need some plus or minus neutral density and in fact for G2 I would suggest its some plus neutral density to get same print time as G2 ilford filter. If you are not using the neutral density then the 25%M would look lighter on the baseboard than a G2 Ilford filter becasue the ND included in the Ilford filters.

 

[John Koehrer]

Not likely The lower contrast grades are yellow. With VC paper and that head just use the Ilford tables.

 

[Photo Engineer]

My Beseler instructions say use a 30M for a grade 2 paper.

PE

 

[ic-racer]

Only way to know for sure is to check with an inexpensive (uncalibrated) step wedge. Just match them with trial and error (the #2 filter and your Magenta wheel).