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So I was doing some random testing and figured I'd share the results for anyone who's interested. I shot the same scene eight times on Arista EDU/Fomapan 400 4x5 sheet film (rated at 320), two with no filter, two with a yellow filter, two with an orange filter, and two with a red filter. I tried to keep the aperture between f/22 and f/29 (f/22 is supposedly where my lens is sharpest), primarily adjusting shutter speed to compensate for filter factor. Lens was the 210mm f/6.8 Caltar.
I then developed one of each in XTOL with a 1+1 dilution and replenished stock XTOL, respectively. For the 1+1 I used a development time of 9:30 at 20c, and for the stock I used a development time of 7:00 at 20c. These were the massive dev shart times for Foma 400 at 400. Unfortunately there is only a published time for Foma 400 shot at 320 for the 1+1 dilution but not for stock, so I developed them both at 400 in order to keep things as consistent as possible.
The purpose of all this was twofold: firstly, to determine whether the cost savings from using the replen method was worth it, or whether there was a significant enough difference in sharpness and contrast to make me stick with 1+1. Secondly, to evaluate how the film performs with my filters, and determine whether there was a significant benefit to using the red filter over the orange filter, as my light meter can do 2 stops of compensation but not 3, which makes using the red filter more annoying.