[pure-silver] Re: Multigrade without filter?

ATIPPETT@xxxxxxx a écrit :
I though that I had read using no filters with Ilford Multigrade IV papers was equivalent to using the #3 filter. Should this be the case what would be the difference in the f stop? Should this not be the case what would the resulting print compare to 2-4? Alan Tippett 



------------------------------------------------------------------------
See what's new at AOL.com <http://www.aol.com?NCID=AOLCMP00300000001170> and Make AOL Your Homepage <http://www.aol.com/mksplash.adp?NCID=AOLCMP00300000001169>. 

------------------------------------------------------------------------

No virus found in this incoming message.
Checked by AVG Free Edition. Version: 7.5.503 / Virus Database: 269.15.16/1102 - Release Date: 31/10/2007 16:38 
With a tungsten light source, it is supposed to be a grade 2.
Note that Ilford Multigrade IV FB is harder by roughly a half grade than its RC counterpart. I don't know how much light is absorbed by these filters compared to no filter. I just did a quick test with a light meter, my enlarger (diffused halogen source) and Ilford Multigrade filter 2 which gives me a factor of roughly 1.5 but the spectral sensivity of my meter certainly doesn't match the paper one. These filters are supposed to give a constant exposure between them except for grades 4 to 5 where exposure should be doubled. These exposure factors are valid for a density around 0.60, that is, changing filter keeps mid-grays but affect both highlights and shadows. 

--

Claudio Bonavolta
http://www.bonavolta.ch

=============================================================================================================
To unsubscribe from this list, go to www.freelists.org and logon to your 
account (the same e-mail address and password you set-up when you subscribed,) 
and unsubscribe from there.

Other related posts: