Rollei Infrared 35mm for B/W

Dear All

Is it correct that I can shoot this film without an IR filter at ISO 400 for “normal” black and white shots ?

I ask because my daughter shot a roll at ISO 400 and it came out very underexposed. Has anyone here shot this film as normal black and white and has some tips ?

Thanks

https://www.rolleianalog.com/wp-content/uploads/2021/02/INFRARED_Datenblatt_EN_R012101.pdf

says mostly 400, but 200 with one developer/time combination.

So, first question is what developer, temperature, and time,

or maybe worn out developer?

Next camera and light meter calibration?

And finally, scenes that fool light meters.

Otherwise, while visible is normally considered 400-700nm, most films

only go to about 650nm.

But the eye sensitivity falls of someone fast after 650nm, though with a long

enough tail. Bright enough, you can see to 700nm or 720nm or even more.

In any case, it is close enough to a normal black and white film, given

normal development conditions. We used to have films that go out

to 860nm or so, that really deserve the name IR films.

https://www.rolleianalog.com/wp-content/uploads/2021/02/INFRARED_Datenblatt_EN_R012101.pdf

 

says mostly 400, but 200 with one developer/time combination.

 

So, first question is what developer, temperature, and time,

or maybe worn out developer?

 

Next camera and light meter calibration?

 

And finally, scenes that fool light meters.

 

Otherwise, while visible is normally considered 400-700nm, most films

only go to about 650nm.

 

But the eye sensitivity falls of someone fast after 650nm, though with a long

enough tail. Bright enough, you can see to 700nm or 720nm or even more.

 

In any case, it is close enough to a normal black and white film, given

normal development conditions. We used to have films that go out

to 860nm or so, that really deserve the name IR films.

Thanks. I will not be developing myself but sending to a lab so I have no idea what they’ll use. I’ve read elsewhere that 80 to 100 asa is more suited to this film (which also aligns with my daughters underexposed shots metering at ISO 400).

Thanks. I will not be developing myself but sending to a lab so I have no idea what they’ll use. I’ve read elsewhere that 80 to 100 asa is more suited to this film (which also aligns with my daughters underexposed shots metering at ISO 400).

Most black and white films do better with a little more exposure, and worse with less.

If exposed properly, such as metered off an 18% gray card, should give nice negatives.

You didn't say what developer and conditions your daughter used, which is what

I thought I was answering.

Otherwise, if you plan to send film out to a lab, and don't need the (not so much)

extra IR sensitivity, I recommend XP2 super.

There is no standard for black and white film developers, so you really don't

know what labs do.

XP2-super uses standard C-41 processing, which labs know well.

Even more, XP2-super allows exposure between EI 50 and 800, with no

development changes needed.