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One of the things I learned on Photrio is that Halogen bulbs are just hotter than average tungsten bulbs. For the purposes of Ilford Multigrade paper, they are the same.I suspect Halogen is similar to tungsten, but I'm not sure.
You could, by referencing Ilford's color filter equivalent chart: https://www.ilfordphoto.com/wp/wp-content/uploads/2017/03/Contrast-control-for-Ilford-Multigrade.pdf
Or you could make your life much easier and get a set of the proper filters. Or at least 00 and 5 and learn split-grade printing.
not a stupid question;try this first:I know this is a really basic and almost stupid question. Can anyone help explain multigrade, specifically Ilford filters to me?
I'm printing on a Beseler 23CIII-XL enlarger with a variable contrast head. This is a link to the head. I'm printing with Ilford MG IV RC Pearl paper at the moment, although I do have some MG Fibre as well. My head has settings for Agfa, Ilford and Kodak papers if IIRC. The Ilford setting goes from green (0) to a dark blue/violet (5). The only instructions I found on Ilfords site say to just set it at 2 and go from there. One of the data sheets also explained that the emulsion on MG paper is sensitive to certain spectrums of light, hence why green vs blue light will help vary the contrast. They offer no other explanation on exactly how or in what situations you would need to use the different filter colors.
If anyone has a link to a basic tutorial I'd really appreciate it. A few hours of searching via google turned up nothing. If anyone can help with a link, or simple explanation of the filters in regard to the specific Ilford paper, I'd really appreciate that too.
Third page, 2nd column.I don't see anything relating to physical filters. I read the whole document before posting to this thread, and all I see are comparisons to enlargers with color heads.
Color-head setting are filter values, and those values should give you a starting point to use your filters.Pieter12, thank you, but as I said, those are enlarger color-head settings.
Pieter12, thank you, but as I said, those are enlarger color-head settings.
The challenge may be to determine the equivalency between Cibachrome filters and CC filters (the Y and M value filters on the chart).Color-head setting are filter values, and those values should give you a starting point to use your filters.
My quick research shows Cyan, Magenta and Yellow filters, in .10 increments from .10 to .50, plus a .05 of each. I don't know if the individual filters are labelled, but by combining them they should work for some grades. Much simpler to get an Ilford set of MG filters and skip the headaches, especially for a beginner.The challenge may be to determine the equivalency between Cibachrome filters and CC filters (the Y and M value filters on the chart).
I don't know if the Cibachrome filters he has have the same designations on them.
My quick research shows Cyan, Magenta and Yellow filters, in .10 increments from .10 to .50, plus a .05 of each. I don't know if the individual filters are labelled, but by combining them they should work for some grades. Much simpler to get an Ilford set of MG filters and skip the headaches, especially for a beginner.
changing from one paper grade to another always requires a fine-tuning in exposure with all papers and all filters!I am glad that Peter has revived this thread as it prompts me to post the following and then ask a couple of questions
This is what Ilford says :"EXPOSURE New Multigrade RC Deluxe is approx. 1 stop faster than MGIVRC and no longer has a large step change in exposure between grade 3.5 and grade 4, therefore only fine tuning of the exposure is now required when switching between all grades." Here are the Ilford comparisons in speed
ISO Speed (P) NB ISO Paper speeds are not the same as Film ISO speeds, MULTIGRADE RC papers have approximately an equivalent Film ISO of 3-6. The speed of MULTIGRADE papers depends on the filtration used during exposure. (see table below) PRODUCT FILTER 00 0 1 2 3 4 5 None MULTIGRADE RC DELUXE - NEW 240 240 240 240 240 220 220 500 MULTIGRADE IV RC DELUXE 200 200 200 200 200 100 100 500
I am assuming that based on Ilford's statement and figures the new DELUXE paper does not require a doubling of exposure with filters 4-5 which was at least easy to remember
All Ilford has said is that it requires "fine tuning"
So can I ask what has been the experience of those using the new DELUXE paper in terms of what increase in exposure is now required when moving from beyond grade 3.5. It would appear to me if I have understood how paper speeds work, that for MGIV there was no change in exposure until grade 4 when it doubled for both grades 4 and 5 and now there is no change until after grade 4 so all grades from 00 to 4 are the same now and the move to grade 5 is about 10% more only? There is no fixed recommendation from Ilford on the increase in exposure required. It uses the phrase "fine tuning "
However as it was possible to give exposure changes with MGIV does this mean, I wonder, if Ilford will not be giving an increase but simply advising that a doubling is no longer appropriate and it is a question for each user of the new paper to "suck it and see" in terms of what increase in exposure he applies when using the grade 5 filter
As an adjunct I am assuming that this may affect the single and double filtration values Ilford recommends applying to those using colour heads or again will it simply advise users to stick with whatever single and double filtration it advises for MGIV up to grade 4 and fine tune those filtrations for grades 4.5 and 5?
Thanks
pentaxuser
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