Infrared photographic film that extends into UV

[photoni]

Infrared photographic film that extends into UV

the only true infrared photographic film was Kodak HIE which extended beyond 800 nm, but it is now no longer in production.

There are currently only two IR films in Europe, Ilford and Rollei IR
I superimposed the graphics of these two photographic films and a panchromatic with very extended sensitivity ... more than the IR ones !
I noticed that all do not exceed 750 nm
the strange thing is that they are very sensitive in the ultraviolet (before 400 nm) they also go beyond 300 nm.

 

The photos were taken with a 1956 Agfa Clack 6x9 cm (25 euro) with a single-lens lens (meniscus) with fixed focus and f11 aperture.   LINK AGFA CLACK
Rollei Infrared film developed in Rodinal (R04) 1+25 for 10.5 minutes

 

The first photo was taken on a clear day from a hill in Verona.
Top with red filter 25 ( 580 nm ) Bottom with Hoya R72 ( 720 nm)
The view is towards the west, at the top you can see a piece of Lake Garda which is about 20 / 30 km away, the mountains in the background are about 60 km away; sharper with R72.
The vegetation below is more real with 25A, fuzzy and clear but not white with R72.
below the color panorama on two different days with Samsung

 

 

The second black and white photo was taken yesterday afternoon in the black locust grove near the house, in the early afternoon with the sun filtering through the trees.
With Hoya R72 (720 nm) and below with TSN575+ZWB2 (UV over 400 nm)
I was amazed that the Rollei Infrared photographic film was able to see even the ultraviolet.

 

in these two to note a greater sharpness of the IR photo in the far part, the UV one has a more precise focus at short distances

(the meniscus has fixed focus f11 from 3 meters to infinity)

 

 

 

 

 

Thanks for the comments...

Antonio

[colinbm]

Great shots, thank for sharing.

 

[lukaszgryglicki]

So this UV photo was taken on IR film, right?

Lookin good.

 

[rfcurry]

Great shots, photoni!

What is "UV over 400 nm"? 

Thanks.

[lukaszgryglicki]

Probably below...

 

[photoni]

@rfcurry  if the Tangsinuo graphs are good it should be 330> 400 nm

 

I think a meniscus should see up to 330 :-)

 

[lonesome_dave]

Photoni thanks for the info on these films and the photos. It is a bit strange to me to see films named as IR that only go to 750nm. As noted that is really just the end of the extended panchromatic range.

 

As for the UV sensitivity I believe all photographic films are quite sensitive to UV. Hence the common practice of using a UV-blocking filter as a lens protector. When I tried shooting some UV images decades ago I had to stay away from the panchromatic films such as Tri-X because the Wratten 18A filter I was using started passing IR around 720nm.

[OlDoinyo]

A few years ago, I posted this topic--perhaps somewhat relevant to the present discussion.

 

The exceptions to the rule about film's being UV-sensitive are overcoated color slide films, and the old Polachrome, which had the emulsion behind the base, the latter containing a reseau which did not pass UV.

[photoni]

@OlDoinyo Your post is very interesting. I hadn't read it.
the Kodak HIE is more sensitive to IR, but the Rollei is sharper and does not have the "ghosting" effect.
Before developing it I did a prewash... black water came out, it's probably a very strong anti halo / reverb layer.

 

As you say all films are more sensitive to blue / UV, in fact with the old lenses a light yellow filter was recommended.
I have two Afga Clack the newer version has the optional yellow filter built in.

When my father in 1964 bought a used Leica f III (1954) in the kit there was a light meter and a yellow filter :-)

[photoni]

@dabateman this post of yours is interesting !

 

[photoni]

There is no flat infrared film in 8x10 inch format, I tried a Shanghai 100 with a 25A red filter (~ 590 nm )

the result is not good, the sky is clear, the ivy on the trees is dark, no Wood effect.
Rodenstock Sironar 360mm f 6.8 - @ f 16 - 1"
unfortunately the wind moved the tops of the trees

 

 

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with the Sony full spectrum .... everything is easy LINK

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