🎞️ Film stocks
What the makers' own data sheets say, side by side.
Speed, process, grain, resolving power and long-exposure corrections for 25 films you can buy, each figure read from the maker's sheet and linked. Where a maker publishes no figure, the space says so; nothing here is estimated. Checked 2026-10-21.
New to the numbers? Deep cuts explains rms granularity, Print Grain Index and how a film's speed is measured; the reciprocity calculator uses the long-exposure rules below.
- Grain
- Foma does not publish rms granularity
- Long exposures
- Multiply 1 s by 2, 10 s by 8 and 100 s by 16 (or open 1, 3 and 4 stops).
- Foma says it takes one stop over or two stops under (EI 50 to 400) without changing development.
From Foma Bohemia: FOMAPAN 100 Classic
- Grain
- Fujifilm's product page gives no rms figure
- Fujifilm describes the colour balance as varying little from −½ to +1 stop.
From Fujifilm: FUJICHROME Velvia 50 product page
- Grain
- rms 8 (ultrafine)
- Fujifilm gives a processing latitude of −½ to +2 stops with little shift in colour balance.
From Fujifilm: FUJICHROME PROVIA 100F product page
- Grain
- rms 8
- Push and pull from −½ to +1 stop with minimal colour and gradation change, per Fujifilm.
From Fujifilm: FUJICHROME Velvia 100 product page
- Grain
- rms 7 · Microfine development, 48 µm aperture
- Resolving power
- 200 lines/mm at 1000:1 · 60 at 1.6:1
- Long exposures
- No correction for exposures under 120 seconds; open ½ stop from 120 to 1000 seconds.
- The lowest rms figure in this register, and no reciprocity correction needed below two minutes.
From Fujifilm: NEOPAN 100 ACROS II (135) data sheet
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.33 beyond 1 second (a metered 10 s becomes 21 s).
- Rated ISO 50; Harman also gives good results at EI 25.
From Harman technology: PAN F PLUS technical information and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.26 beyond 1 second (a metered 10 s becomes 18 s).
- Finest grain at EI 100; good from EI 50 to 200.
From Harman technology: DELTA 100 PROFESSIONAL technical information (Apr 2023) and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.26 beyond 1 second (a metered 10 s becomes 18 s).
- Good results from EI 50 to EI 200 by Harman's own range.
From Harman technology: FP4 PLUS technical information and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.43 beyond 1 second (a metered 10 s becomes 27 s).
- Extended red sensitivity to about 740 nm: with a very deep red filter, Harman says skies go almost black and most green vegetation almost white.
From Harman technology: SFX 200 technical information and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.41 beyond 1 second (a metered 10 s becomes 26 s).
- The highest reciprocity factor among Ilford's films apart from SFX: a metered 30 s needs about 121 s.
From Harman technology: DELTA 400 PROFESSIONAL technical information and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.31 beyond 1 second (a metered 10 s becomes 20 s).
- Harman rates it ISO 400 but says it makes high-quality prints at EI 3200 with extended development.
From Harman technology: HP5 PLUS technical information and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.31 beyond 1 second (a metered 10 s becomes 20 s).
- A chromogenic film: the image is dye, formed in standard C-41 colour chemistry.
- Harman says push processing gives no practical speed increase; rate it at EI 800 with normal processing instead, and labs should replenish as for an ISO 200 colour negative.
From Harman technology: XP2 SUPER technical information and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
Ilford · Black and white · B&W
Ilford Delta 3200
ISO 1000 · ISO 1000/31° measured in ID-11; designed to be exposed at EI 3200 with extended development
- Grain
- Harman does not publish rms granularity
- Long exposures
- Ilford's rule: corrected seconds = metered seconds ^ 1.33 beyond 1 second (a metered 10 s becomes 21 s).
- Harman's measured speed is ISO 1000; 3200 is the recommended meter setting, and it can go to EI 25000 with testing.
- Harman notes its speeds come from practical evaluation, not the foot-speed criterion the ISO standard uses.
From Harman technology: DELTA 3200 PROFESSIONAL technical information (Jun 2025) and Harman technology (Ilford): Film reciprocity failure compensation (Dec 2023)
- Grain
- rms 8 (extremely fine) · read at a gross diffuse visual density of 1.0
- Long exposures
- No filter or exposure correction from 1/10,000 to 10 seconds; at 120 seconds add CC10R filtration.
- Kodak's sheet calls for no filter or exposure correction anywhere from 1/10,000 to 10 seconds.
From Kodak Alaris: EKTACHROME Film E100, E-4000
- Grain
- Print Grain Index from 35mm: 4x6 <25, 8x10 38, 16x20 66
- Kodak calls it the world's finest-grained colour negative film; a 4x6 from 35mm stays below the visible-grain threshold.
- Kodak's July 2025 sheet lists a 0.10 mm ESTAR (polyester) thick base for 135 and 120.
From Kodak Alaris: EKTAR 100 Film, E-4046 (2025)
- Grain
- rms 8
- Resolving power
- 200 lines/mm at 1000:1 · 63 at 1.6:1
- Long exposures
- 1/10,000 s: +⅓ stop; 1/1,000 to 1/10 s: none; 1 s: +⅓ stop; 10 s: +½ stop (15 s); 100 s: +1 stop (200 s).
- Kodak's T-GRAIN emulsion: flat, tabular silver halide crystals.
- Resolving power 200 lines/mm on a 1000:1 chart, 63 lines/mm on a 1.6:1 chart.
From Kodak Alaris: T-MAX 100 Film, F-4016
- Grain
- Print Grain Index from 35mm: 4x6 28, 8x10 50, 16x20 79
- Kodak's July 2025 sheet lists a 0.10 mm ESTAR thick base for 135 and 120, and 0.19 mm for sheets.
From Kodak Alaris: PORTRA 160 Film, E-4051 (2025)
- Grain
- Print Grain Index from 35mm: 4x6 44, 8x10 64
- The sheet also covers 120, where a 4x6 print scores a PGI of 33.
From Kodak Alaris: GOLD 200 Film, E-7022
- Grain
- rms 16 (fine)
- Shares a data sheet with Tri-X 400 but is its own emulsion, with a two-stop push to EI 1250.
From Kodak Alaris: TRI-X 320 and 400 Films, F-4017
- Grain
- Print Grain Index from 35mm: 4x6 37, 8x10 59, 16x20 89
- Long exposures
- No correction from 1/10,000 to 1 second; test beyond.
- The same 8x10 print scores a PGI of 59 from a 35mm negative and 37 from 120.
- Kodak's July 2025 sheet lists a 0.10 mm ESTAR thick base for 135 and 120.
From Kodak Alaris: PORTRA 400 Film, E-4050 (2025)
- Grain
- rms 10
- Resolving power
- 200 lines/mm at 1000:1 · 50 at 1.6:1
- Long exposures
- No correction at 1/10,000 s; see the sheet for long exposures.
- Kodak says it can be exposed at EI 3200 with longer development.
- At rms 10 it is finer-grained than Tri-X 400 (17) at the same box speed.
From Kodak Alaris: T-MAX 400 Film, F-4043
- Grain
- rms 17 (fine)
- Long exposures
- 1 s: +1 stop (or 2 s), 10 s: +2 stops (50 s), 100 s: +3 stops (1200 s); cut development 10, 20 and 30%. At 1/10,000 s: +½ stop.
- Kodak lists push ratings of EI 1600 (two stops) and EI 3200 (three stops) with longer development.
- Tri-X 320 is a separate film with an rms granularity of 16.
From Kodak Alaris: TRI-X 320 and 400 Films, F-4017
- Grain
- Print Grain Index from 35mm: 4x6 46
- A 4x6 from 35mm has a PGI of 46, against 37 for Portra 400 at the same size.
From Kodak Alaris: ULTRA MAX 400 Film, E-7023
- Grain
- Print Grain Index from 35mm: 4x6 48, 8x10 70, 16x20 99
- Kodak publishes characteristic curves for EI 1600 (one-stop push) and EI 3200 (two-stop push).
From Kodak Alaris: PORTRA 800 Film, E-4040 (2025)
Kodak · Black and white · B&W
Kodak T-Max P3200
ISO 1000 · EI 1000 in T-MAX developers, EI 800 in other Kodak developers; made to be pushed to 3200 and 6400
- Grain
- rms 18
- Resolving power
- 125 lines/mm at 1000:1 · 40 at 1.6:1
- The 3200 is a push rating: Kodak gives the film's nominal speed as EI 1000 in T-MAX developers.
- Kodak says to make tests before rating it beyond EI 6400.
From Kodak Alaris: T-MAX P3200 Film, technical data
Every figure is read from the maker's own data sheet or product page, linked on each film. A blank is a figure the maker does not publish, never a zero. Resolving power in lines per millimetre on a low-contrast (1.6:1) and a high-contrast (1000:1) test chart. Spotted a newer sheet? Tell us; the linked document always wins over our copy.