Long exposures with strong ND filters - Ilfords BW films
Do you have experience with long exposures on Ilfords BW negative films with strong ND filters (etc. Hitech 3,0 ND Pro Stop, Hitech standard ND 3,0, Lee Big Stopper, B+W 106 ND, B+W110 ND)? Long exposures in daytime for 1min., 2min. max 10 minutes.
I tried Ilford Pan F Plus with orange filter and Hitech 3,0 Pro Stop ND filter for this work. Ilford Pan F Plus, because is slow film ISO 50 and with Perceptol EI 25 an this film have poor reciprocity charakteristic. This reciprocity failure is benefit for this work. I rated Pan F Plus as EI 25 and developed with Perceptol 1+1.
But, I have a problem with Ilford Pan F Plus and Perceptol 1+1. I developed Ilford Pan F Plus with Perceptol 1+1 (perceptol + destiled water, water from reverse osmosis) 10min 30s and 20 Celsius degrees, aborted with destiled water from osmosis (2x this water), fixed with Foma Fomafix 3min, washed with drinking water 10min, at the end wraped to Foma Fotonal with destiled water from osmosis 2min. All solutions were tempered to 20 Celsius degrees.
I got this result after scanning. This structure is also on negative. Picture is original resized to 800x600. Is it normal? I am bit disappointed wiht this result. This is a long expsure with Hitech 3,0 ND Pro Stop. Exposure time was 2min 30s. Scanned with Noritsu S-4 and then scanned with Nikon Coolscan 9000ED with nearly same result as Noritsu.
Do you have any pictures with long exposure on Ilfords BW films? I would like to see some works and discuss about this point. I would like to discuss about good choice of strong ND filter for BW negative.