Maco 4x5 experience + question

["paul vandepitte" <paulvandepitte@xxxxxxxxxxx>]

Hi,

I ordered some boxes of 4x5 sheets en 120-rolls IR-film from Maco. I did my 
first test while travelling and shot about 10 sheets in Jordan. The results 
are however disappointing, and I am looking why. Here are the details on the 
followed procedure:

- I used the 87-filter from Lee (transmitting begins above 730 nanometers),
- I rated the film at ISO 12;
- Equipment: Tachihara field camera with Schneinder Super Angulon 90 mm (f8)
- development: ID11 1+0 20° 10 min

I have the impression that most of the negatives are underexposed by two 
stops.

Some questions:
- can the underexposure be explained by the difference of a Kodak 89b filter 
(680 nm) and the Lee filter (730 nm)??
- what are the reciprocity values for the MACO IR-film?? Most of the 
exposure times were more than several seconds...

I have had quite positive results with the Kodak HIE (4x5), which could be 
rated at ISO100!

Thanks in advance...


Paul Vandepitte
Martelarenlaan 187
3010 Kessel-Lo
Belgium
tel/fax 00-32-16.25.12.22
mailto:paulvandepitte@xxxxxxxxxxx
http://surf.to/pvdp
icq:61089057

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