Re: Development or Exposure?

[Clive Warren <Clive.Warren@xxxxxxxxxxxxx>]

At 10:13 am +0100 13/1/00, Martin Gebhardt wrote:

>Hi there,
>
>My latest roll of HIE (acually the first one I developed myself) turned
>out much better than the first one. No fogging this time, but still, the
>film is very dense. I wonder if this is from over-exposure or
>over-development.
>
>I took my pictures on a sunny morning (itīs winter here!) in a
>greenhouse with my FM2. ASA setting was 800 and I metered through the
>lens with a #29 dark red filter in front of it. Should have been 1 or 2
>stops less???
>
>For development I used Tetenal Ultrafin 1+20, 17 minutes. I computed
>this based on D-76 development times by Laurie White compared with how
>D-76 and Ultrafin are used with Delta 400. What do you think?
>
>The film base is still clear, and there is still some (little) contrast
>in the lights but the overall impression is: heavily overexposed. Apart
>from that my images turned out sharp and typical infrared-like.
>
>Greetings, Martin.


Martin,

>From the IR FAQ (see URL in sig, file) the development times for HIE in
Ultrafin are 13 mins at 20C so your developing time is probably too long.

Meters all differ regarding how well they respond to infrared light. There
really is no substitute for shoooting a few test rolls with your chosen
camera, filter and developer combinations.

There is a guide which some people have found useful in section 12 of the
Infrared FAQ: "Exposing - Film Speeds and Rating for Filters".

In full sunlight with a lot of greenery around you, there will be a lot of
reflected infrared light.  My guess is that there was also overexposure.

So there you have it - the worst case scenario and one which I have
experienced when tryng to use long exposures and pushing the film when
there was far too much infrared light coming from a small source in the
scene. It's amazing how HIE acts as a light pipe - in one frame the film
rebate was also exposed :-)


All the best,

             Clive   http://www.cocam.co.uk
                     Photographic Services, Filters and Equipment, Infrared FAQ
                            http://clive.bel-epa.com
                            Adventures in Cyberspace - Digital Art and Photos


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