DBI....filter?

[Mike A]

I'm about to try DBI with Pyrocat HD and would like to know if I need the #3 green filter or a red one? I've read that with the Pyrocat you need a red filter. Any tips on DBI would be appreciated.

Mike A

 

[removed account4]

hi mike

the red filter is for orthochromatic film + photo paper.
you want the dark green filter for dbi pan-film.

- - john

 

[David A. Goldfarb]

If you haven't already ready it, there is a good article on DBI at http://www.michaelandpaula.com/mp/devinsp.html

 

[Mike A]

DBI

If you haven't already ready it, there is a good article on DBI at http://www.michaelandpaula.com/mp/devinsp.html

Thanks Dave, studied it thoroughly.
Mike A

 

[Ole]

There are two different reason for choosing one over the other:

The eye's sensitivity peaks in the green - so less light intensity gives more "vision".

But: Red doesn't damage the night adaptation, so doesn't need much illumination anyway.

Balance this against the film's sensitivity, and sometimes green is better, sometimes red. I use red with the slower EFKE films, green with most others. Sometimes I just accept that my darkroom isn't very light-proof, and after five minutes in there I can see what I'm doing just by the light from the light leaks. Many people would be very surprised at just how much light you can have and still not fog the film...

 

[matt miller]

I use a red filter to DBI TMY. You can't see nearly as much with a green filter with this film.

 

[vet173]

I use an OA light for inspection when not using my night vision goggles. In my small half-bath where I develop film I have the beehive in the upper corner pointed at the wall 16" away, so all light is reflected. Pyrocat desensitises the film making this possible. For other developers I recommend green.