Rollei/Agfa's Ortho 25 is 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.

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. 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: 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. 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: 4. Where do you send it for processing? Does it get processed as B&W film?

A: Definitely can develop as BW... I process the BW but I would vouch for The Darkroom Lab if you have anything complex or want high quality

Q: 5. can i develop ilford ortho, using cinestill Df96?

A: The manufacture of Cinestill DF96 Monobath for Black & White Film lists many films as compatible. They do not list that film. It is possible that it can work fine with that film. But you will need to experiment on the dilutions. This is the information on that developer and possible dilutions, https://bit.ly/30uzYuR . And this is the developers and dilutions Ilford list for that film, https://bhpho.to/33lxT6c .

Q: 6. Can this film be developed in Ilford ILFOTEC DD-X Developer?What is the developing time using the Ilford ILFOTEC DD-X Developer? any recomendations?

A: Hi Ali,So far I have only used Kodak D-76 (1:1), I have been delighted with my results..I don't know if ILFOTEC DD-X compares with D-76.Good Luck enjoy the Film!!!

Q: 7. If you used an 850 IR filter with this film would you still get an image or would it just block all light?

A: Rollei infrared is only sensitive up to 850nm. So anything that's blocks 850nm and down prob won't produce an image. I use a Hoya 72 filter with this film.

Q: 8. how does one get the the whited out foliage appearance and darkened sky appearance on this film? is it random? or is it more of an exposure trick?

A: You need an IR720 filter . That filter helps this film pick up that infrared wave length of light that will give the effects you asked about.

Q: 9. Given that this film is less sensitive to IR light than visible light, what ASA should it be shot at for infrared photography?

A: It depends on the filter you use with the Rollei Infrared 400 Black and White Negative Film (35mm Roll Film, 36 Exposures). Some say, exposing the film at a maximum of ISO 25 and using an R72 dark red infrared filter or deeper infrared filter. Note it takes experimentation and trial and error

Q: 10. 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.