Rollei Ortho 25 B&W Film 35mm 36 Exposures Expired 03/2024is an orthochromatic black and white negative film optimized for technical, scientific, and half-tone work, as well as creative and pictorial applications. Characterized by extremely high sharpness and resolving power, this unique film also features an impressively fine grain structure and is also well-suited to reversal processing for black and white transparencies. Ortho 25 has a nominal sensitivity of ISO 25/15° and a high-sensitivity reserve of two stops for greater flexibility when shooting. Its spectral sensitivity ranges from 380-610nm and is suitable for photographing in either daylight or tungsten-lit conditions. The film's polyester base has been tested to an LE-500 (life expectancy 500 years) archival rating and also features anti-curling and anti-static coatings, as well as a special coating to promote smooth film transportation within the camera. Additionally, this clear base is particularly well-suited to scanning applications.

This item is one 36-exposure roll of 35mm film, expired on March 2024.

Orthochromatic B&W Negative Film    ISO 25/15° in Standard Process    Very High Sharpness and Fine Grain    Two-Stop Exposure Reserve    Ideal for Tech. & Half-Tone Applications    Spectral Sensitivity: 380-610nm    Archival LE-500-Rated Polyester Base    Suitable for B&W Reversal Processing

Related Questions and Answers

Q: 1. what's the developing time for this film using Kodak X-tol developer, I used hoya R72 filter

A: I don't know the effective reduction of your filter, but for an effective ASA of 50 a 1+1 dilution at 20 degrees C and a time of 7 1/2 minutes should suffice.

Q: 2. retro 80 suitable for reversal processing?

A: I have not reverse-processed this film, but the process can be done with virtually any traditional B&W emulsion. I would think that this film would be a very good choice for reversal processing as it is fine grained, has a clear base, and tends to have relatively high contrast.

Q: 3. Is this film sensitive to the wavelenhth at Hydrogen Alpha (656.281 nm) what are its reciprocity characteristics and is it generally useful for astrophotography?

A: Rollei INFRARED has an infrared range of (650 – 750nm). According to Rollei, the reciprocity is 1.43. IR film needs IR light which is more available during the day. Shooting it at night would be experimental.

Q: 4. The specs say this film has "Extended Infrared Sensitivity". Can you tell me what the wavelength cuttoff is at the upper end? How far into the IR spectrum does this go?

A: Spectral sensitization 380 - 730nm

Q: 5. Would Ilford Simplicity kit work for this film? https://www.bhphotovideo.com/c/product/1448926-REG/ilford_1178858_simplicity_film_kit.html What is development time/temperature? Thank you

A: The Ilford SIMPLICITY Starter Pack can be used to develop Rollei Retro 80S Black and White Negative Film (35mm Roll Film, 36 Exposures). This should have a developing time with ILFOSOL 3 (1+9 dilution) of 5 minutes at 68°F / 20°C.

Q: 6. What are the differences between this, the Retro 400s, vs the RPX 400?

A: The main difference is, Rollei Retro 400S Black and White Negative Film (35mm Roll Film, 36 Exposures) is more sensitive to Infrared light. But in most uses you will not see the difference.

Q: 7. expired date?

A: This film is fresh dated, at least a year.

Q: 8. Would anyone care to comment on how this compares to the late Agfapan 25 (APX 25)?

A: Essentially the same, if not entirely.

Q: 9. Is this batch still made in the Belgium factory or some where else?

A: Country of origin is still Germany, has not changed for many years.

Q: 10. How would the camera's exposure / auto-metering be affected by using a fill-flash covered with a 720nm filter (as primary light source)?

A: The exposure would be cut down by quite a bit. It doesn't make sense to shoot in auto. You will have to shoot in manual mode and test by trial and error.