Ilford Ortho Plus Black and White Negative Film (120 Roll Film) - Manual (Page 2)

Page 2 of 5 Oct 2019
ORTHO PLUS FILM Technical Information
FILTER FACTORS
The factors quoted below give a practical guide to the increase in exposure necessary when using the filters
listed. For other types of filters, follow the instructions given by the filter manufacturer.
Daylight Tungsten
104 Alpha (yellow) 2.5 1
109 Delta (deep yellow) 5.5 3
304 Tricolour Blue 3 5
404 Tricolour Green 8 4.5
MAKING LONG EXPOSURES
For exposures between 1 and 1/10 000 second, no
adjustments are needed for reciprocity law failure.
When exposures longer than 1 second are given,
ORTHO Plus film, along with other films, needs to be
given more exposure than indicated by a meter. Use the
graph to calculate the increased exposure time which
should be given once the measured time is known.
The graph is based on the formulae Ta = Tm 1.25
Ta = Adjusted Time
Tm = Measured Time
CHOOSING THE BEST ILFORD DEVELOPER FOR THE JOB
The table below gives development times in minutes for the stated contrast (Gbar). Development times may be altered
if a different contrast is needed. Gbar 0.62-0.70 would be considered normal for in camera use.
Pictorial Contrast °C / °F Min:Sec
Developer Dilution Temp Gbar 0.62 to Gbar 0.70
ILFOTEC DDX 1+4 20/68 10.30 13.00
ILFOSOL 3 1+9
1+14
20/68
20/68
5:00
7:00
6:30
8:30
ID11 Stock
1+1
1+3
20/68
20/68
20/68
08:00
10:30
16:00
10:00
13:00
20:00
MICROPHEN Stock
1+1
1+3
20/68
20/68
20/68
9:00
11:30
13:30
12:00
14:30
17:00
PERCEPTOL Stock 20/68 13:00 16:00
ILFOTEC HC 1+15
1+31
20/68
20/68
4:00
6:00
5:00
8:00
ILFOTEC DD 1+4 24/75 5:30 6:30
ILFOTEC RT RAPID 1+1+2
1+1+5
26/79
26/79
1:05
1:18
2:07
2:33
Intermediate Contrast Gbar 0.80 to Gbar 1.00
PQ Universal 1+9 20/68 4:00 12:00
High Contrast Gbar 1.2 to Gbar 1.80
PHENISOL 1+4 20/68 3:00 10:00
Note For dish/tray development with continuous agitation, reduce these times by 15%.