---
title: "Film Washi Z 400 35mm"
url: https://shop.neoanaloglab.com/en/products/washi-z-135
language: en
description: "An industrially coated aerial-survey emulsion re-spooled by Film Washi: ISO 400 black and white, panchromatic with sensitivity reaching 750 nm in the near infrared."
---

# Film Washi Z 400 35mm

Film Washi · Film · 135 / 24 exposures / ISO 400

- Price: ¥2,280 (JPY, consumption tax included)
- Availability: In stock (5)
- Condition: New
- SKU: WASH-FILM135-Z-ISO-400
- GTIN / JAN: 3770027506027
- Ships outside Japan: Yes, by Japan Post
- Buy: [Checkout page](https://shop.neoanaloglab.com/buy/WASH-FILM135-Z-ISO-400:1?context/language=en) — Opens a confirmation page; stock is reserved and payment is taken only when the buyer continues to Stripe Checkout.

## Description

An industrially coated aerial-survey emulsion re-spooled by Film Washi: ISO 400 black and white, panchromatic with sensitivity reaching 750 nm in the near infrared.

Z is not one of Film Washi's hand-coated papers: it is an industrially coated aerial-survey emulsion that the maker buys in and re-converts to camera formats in its Brittany workshop, where its original job was mapping — sensitivity running into the near infrared pulls apart masses of vegetation that ordinary panchromatic film renders as one flat grey. Film Washi rates it 400 ISO on a clear 100 µm polyester base and gives its spectral maximum as 750 nm, classing it as panchromatic with an extended red tail rather than as a true infrared film. The maker recommends it for landscape, citing strong contrast and unusually clean separation of greens, explicitly including under overcast weather; the infrared effect — dark sky, lightened reds and greens — can be exaggerated with a red filter, and no IR-pass filter is asked for anywhere in the datasheet. The clear base pipes light, so the datasheet tells you to load in shade and shoot three blank frames before starting the roll, and extra leader is supplied for exactly that. The 24-exposure cassettes are recycled and carry no DX code, so set 400 by hand — and note Film Washi's own caution that recycled cassettes are not recommended in fully automatic or motorised cameras. Development is ordinary black-and-white chemistry: the datasheet gives D-76 stock 10 min, Xtol stock 8 min, Rodinal 1+25 7 min and Ilfosol 3 1+9 4.5 min at 20 °C, Ilfotec RT Rapid undiluted for 70 s at 26 °C, and for any developer not on that list, the times and dilution for Ilford Delta at 400. In the darkroom it must be handled in total darkness — no safelight of any colour. Film Washi asks customers to check with their lab in advance only for films W, V, Y and R; Z is not one of them.

## Specifications

| Specifications | |
| --- | --- |
| Format | 135 / 24 exp |
| Speed | ISO 400 |
| Process | Black and white negative |
| Base | Polyester (PET), 100 µm, clear, antistatic backlayer |
| Spectral sensitivity | Panchromatic with extended red, maximum 750 nm |
| Grain | Low |
| Development | 20 °C: D-76 stock 10 min / Xtol stock 8 min / Rodinal 1+25 7 min / Ilfosol 3 1+9 4.5 min. Ilfotec RT Rapid undiluted 70 s at 26 °C |
| Safelight | Total darkness — no safelight of any colour |
| Cassette | Recycled 135 cassette, no DX code |

## Shipping and returns

- Free shipping within Japan on orders of 15,000 JPY or more.
- Roll film ships free from 3 rolls of 135 or 5 rolls of 120.
- Otherwise 500 JPY for small tracked roll-film parcels and 900 JPY for other tracked shipments.
- Orders ship within 2-5 business days after payment is confirmed (weekends and Japanese holidays not counted). Delivery within Japan usually takes 1-2 days (2-4 for small roll-film parcels).
- Ships to 165 countries and regions by Japan Post at Japan Post's own postage (International Air Packet, International Parcel by air, EMS), priced by destination and packed weight.
- Returns: Within 30 days of delivery. Change-of-mind returns must be unopened and unused; damaged or defective items are accepted even if opened.

## Questions

- **Does film need to be refrigerated?** Store unexposed film in a cool, dark place away from heat and humidity. For storage beyond a few months, refrigeration below 10°C is recommended. Let film return to room temperature in its packaging for 2-3 hours before shooting to avoid condensation.
- **What is the difference between C-41, E-6, and black-and-white processing?** C-41 develops color negative film, E-6 develops reversal (slide) film, and black-and-white negative film uses dedicated B&W chemistry. The Neo Analog Lab mail-in processing service handles C-41, E-6, ECN-2, and black-and-white.
- **What is the difference between 135 and 120 film?** 135 is standard 35mm cassette film, usually 24 or 36 exposures. 120 is medium-format roll film: about 16 frames at 6x4.5, 12 at 6x6, or 10 at 6x7. Check which format your camera takes before ordering.

## Images

- https://shop.neoanaloglab.com/product-images/products/prod_washi_z_135/Z135_product_00.jpg

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Prices and stock as of: 2026-10-21T05:11:00.113Z · https://shop.neoanaloglab.com/en/products/washi-z-135