1. Summary
Our infrared Films are from Maco:
A short summary of attributes of this MACO Black & White Infrared
Film
- true infrared sensitization up to 820nm
- wide range of applications in scientific/technical
and pictorial photography
- very fine grain
- high sharpness
- excellent resolving power
- integrated antihalation coating
- clear base
- attractive value for money
- complete assortment, 135-36, 120 and 4x5"
2. Short introduction
Black & white IR Photography is being applied for many decades
now. Main application fields today are scientific, technical and pictorial
photography.
For every application there is a book covering practical
working aspects. Furthermore, interested customers can use the Internet
as a reliable source of information. We strongly recommend to use this
proven information channels.
Infrared photography inspires photographers around the
world for unusual, "never seen before" images. As the special charism
of infrared images can hardly be described, we recommend to take a trip
into the field of invisibility yourself to virtually see what is in there
for you.
3. Assortment
- 35 mm film, double perforation, 136-36 cartridge,
DX code
(metal cartridge easy opening by hand, reusable)
- 120 rollfilm
- sheetfilm in size: 4" x 5", 25 Sheets
4. General data of the emulsion and the basematerial
Emulsion:
panchromatic, cubic crystal emulsion with additional infrared sensitization
up to 820 nm, integrated antihalation coating (water soluble) allows for
excellent resolving power.
Base:
clear base, delivers short printing times and allows for excellent reversal
processing results with high projection brilliance.
5. Data on ISO values/Film speed and use of filters
As normal ISO speed values do not apply, we recommend
to apply f-stop bracketing and trial development to establish individual
data for best results.
ISO Film speed without filter is ISO 100/21°.
Working with filters (strongly recommended) and depending
on the type of lighting (sun at noon, sunset, tungsten or electronic flash
where infrared radiation varies strongly) take following chart as a guideline
only. For approximate ISO Speed starting points (approximate due to the
unmeasurable infrared radiation) please refer to our processing chart
with ISO settings.
Which filter for which effect ? - A filtration guideline
Filter color |
Filter No._ |
Spectral trans-mission (from nm up)
|
Effect |
dark yellow |
12
|
500
|
darker sky |
orange |
22
|
550
|
clouds show details |
red |
25
|
580
|
beginning moonshine effect |
dark red |
29
|
610
|
beginning "Wood" effect |
very dark red |
70
|
660
|
good "Wood" effect |
IR black |
88A
|
730
|
absorbs visible light |
IR black |
87
|
740
|
absorbs visible light |
IR black |
87C
|
800
|
absorbs visible light |
_ Filter No.'s refer to the Kodak Wratten nomenclature
6. Storage and handling
Store unexposed film at 55°F / 13°C or lower
in the original package. After exposure, develop promptly. If direct processing
is not possible, store well contained, dry and cool until processing.
The MACO IR 820c has to be handled in total darkness
only. If unsure, test your camera, film holders, processing equipment
(Jobo tanks are safe). Load and unload your camera in total darkness.
7. Processing informations
Preferably use stainless steel developing tanks or wrap
aluminum foil around plastic tanks or develop in complete darkness.
Important: As the antihalation coating is water dissolvable,
a prewash of one minute before development will be carried out in order
to remove it. The prewash water will have a greenish blue color.
All given times are to be viewed as a guideline and are
based on 21°C / 70 F. Agitate the first 30 seconds constantly, then
once every 30 seconds! Thus the best possible acutance (edge sharpness)
will be achieved.
Following chart has been worked out by using a PENTAX
Spotmeter in combination with an infrared filter HELIOPAN 695 (89B).
Data for exposure/development/fixing
Manufacturer/ product |
Dilution |
Measure |
time in min. |
ISO Speed setting |
Kodak XTOL |
(1+3)
|
Spot |
14
|
12/12° = N+3 |
Kodak XTOL |
(1+3)
|
Integral |
14
|
50/18° = N+3 |
LP Docufine LC |
(1+4)
|
Spot |
7
|
32/13° = N+2 |
LP Docufine LC |
(1+4)
|
Integral |
7
|
40/17° = N+2 |
LP-GRAIN liquid |
(1+7)
|
Spot |
7
|
40/17° = N+2,5 |
FIXING: |
|
|
|
|
LP-FIX SUPRA |
(1+7)
|
|
5
|
|
Preferably use LP-FIX SUPRA, a high energy rapid fixer
based on X-Ray technology, rather than using a conventional fixer(e.g.
MACO ecofix). After washing has been completed, the use of LP-MASTERPROOF
wetting agent is highly recommended.
|