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Dave Thomas | profile | all galleries >> The Longer Wavelengths >> Rollei Infrared 400 tree view | thumbnails | slideshow

Rollei Infrared 400

The film used here was Rollei Infrared 400, almost the only choice. It is not sensitive as deep into the IR region as one might like, but it is workable.

Two different filters were tried, one with a cut-off at 720 nm and one at 760 nm. The latter appeared substantially better at producing the IR effects YOP remembers from days of yore with an 89B filter. The downside is, it requires a huge amount of exposure increase relative to the 720 cut-off. And after a second testing, some of YOP's disappointment in the IR72 filter may have been a bad choice of test scenes or exposure, especially considering the old traditional 89B is only about a 695 nm cut-off.

YOP has tentatively settled on about EV-13 for the IR760 filter and about EV-6.5 for the IR72. The Rollei film also gives decent results as a panchromatic ISO 400 film without the filters. Given that it costs two to three times what more ordinary panchromatic films sell for, the only incentive to use it unfiltered is to get a known good starting point on a roll to isolate processing problems from exposure problems. Note that EV-13 gets exposures down into the 2 sec @ f5.6 area, so this use will not likely find its way into action sports photography!

Kodak HC110 developer, dilution B (1+31) was the soup of choice. About 8.5 minutes developing time at 68ºF (20ºC), agitating five seconds per minute, proved to be a reasonable starting point for processing.

Herewith we present a selection of shots from the series:

Heckler Barn - Infrared
Heckler Barn - Infrared
Schwenksville
Schwenksville
Bridge Arch
Bridge Arch
Upper Schuylkill Park
Upper Schuylkill Park
Upper Schuylkill Park
Upper Schuylkill Park
Mounce Jones House
Mounce Jones House
Ex-RR Bridge at Douglassville
Ex-RR Bridge at Douglassville
Trail Bridge
Trail Bridge
Schuylkill View
Schuylkill View
Allegheny Aqueduct
Allegheny Aqueduct
Allegheny Aqueduct
Allegheny Aqueduct
Ex-PRR Bridge near Oaks
Ex-PRR Bridge near Oaks
South Side - Ex-PRR Bridge
South Side - Ex-PRR Bridge
Schuylkill River Trail Bridge
Schuylkill River Trail Bridge
Ex-PRR Bridge
Ex-PRR Bridge
New Route 113 Bridge
New Route 113 Bridge
Trail Under 113 Bridge
Trail Under 113 Bridge
Trail & Route 113 Bridge
Trail & Route 113 Bridge
Bridge Pier
Bridge Pier
Bridge Pier
Bridge Pier