color enlarger filter settings for Fomaspeed variable grade paper

[bonk]

I would like to try this Fomaspeed Variant 311 variable grade paper which require these filters.

But I have a the JOBO LPL C7452 Colour Enlarger and according this pdf the color mixing head can also be used instead of the filters.

The question now is: How do I find the correct filter dial settings so they match the Foma filters? That PDF lists different settings for different color enlarges:

But JOBO is not listed. How do I find the ones for JOBO?

 

[pentaxuser]

In the Ilford instructions on setting grades with a colour head, it lists most enlargers under the above 4 groups. LPL gets listed under Kodak. So it looks as if you can use the KODAK settings.

pentaxuser

 

[Rudeofus]

The table you show here is quite incomplete: Durst makes color heads which go up to 130 and others which go up to 170, and well written instructions describe filtration for both types.

Many years ago I taped the filtration instructions for one paper brand to my dark room wall, somewhere below a safelight to make it readable. Since then I have used these same filtrations for each and every multigrade paper and they always served their purpose. Fomaspeed Variant may look about a grade softer than comparable Ilford MGIV paper, but one step up/down in gradation shows about the same amount of change with both brands.

 

[bonk]

In the Ilford instructions on setting grades with a colour head, it lists most enlargers under the above 4 groups. LPL gets listed under Kodak. So it looks as if you can use the KODAK settings.

pentaxuser

But Kodak has a * next to it which seems to mean "printing filters". The other ones have "color mixing head". I wonder what that means and what the difference is.

 

[ic-racer]

https://www.photrio.com/forum/threads/making-a-multigrade-calibration-table-for-color-head.42839/

 

[pentaxuser]

But Kodak has a * next to it which seems to mean "printing filters". The other ones have "color mixing head". I wonder what that means and what the difference is.

I have no idea, sorry. Foma, unless it makes it clear what printing filters means has succeeded in making matters more confusing and as Rudeofus has said there are two Durst dichroic lists which seem to have been overlooked.

The quickest way to get to the bottom of this is might be to contact Foma and while you are doing this I'd ask about half grade settings as well. If you do let us know what Foma's response is. Thanks

pentaxuser

 

[jimjm]

I've used the filtration values listed in the Ilford Contrast Factors document on different brands of VC paper, and my results have been pretty consistent. I'm using a Saunders/LPL enlarger with the dichroic color head.
Yours would also correspond to the listed Kodak values for filtration. If you use the single filtration value, your print times will probably be shorter. If using the multiple filtration value, print times will be longer, but you won't need to vary the times as much if you increase or decrease the contrast.