From: Tom Ferguson (tomf2468@pipeline.com)
Date: 01/29/03-10:21:26 AM Z
Just a "me too" to Sandy's post. In my experience sunlight is more
contrasty than UV tubes.
I strongly suspect that a correctly developed neg for each situation
will make a virtually identical image.
On Wednesday, January 29, 2003, at 08:12 AM, Sandy King wrote:
> Chris,
>
> With all processes I have used you get more contrast by exposing in the
> shade with the frame pointed at the north sky than by exposing in
> direct sun with the frame pointed directly toward the sun.
>
>
> Sandy
>
>
>
>
>> Yes, Sandy,
>> This is why I brought this up. I was always under the impression
>> that
>> sun at a 90 degree angle to the contact frame would produce the
>> sharpest,
>> nicely contrasty print. Uv would be more of a diffuse source of
>> light. Now
>> that I have said James said this, I should perhaps clarify his quote:
>> p.
>> 109, "You can also achieve lower contrast appearance in your image by
>> using
>> the sun as your UV source. Cyanotype exposed by sunlight tends to
>> provide a
>> longer tonal range than does a mechanical UV light and thus creates a
>> lower
>> contrast image by a light to dark association.". IT seems in essence
>> he is
>> talking about apparent contrast, the tones relating to one another, a
>> longer
>> tonal range equating with an apparent lower contrast. But still, it
>> seems
>> fishy.
>> However, you are saying, below, that the north sky produces
>> greater
>> contrast??
>> Chris
>>
>> ----- Original Message -----
>> From: "Sandy King" <sanking@clemson.edu>
>> To: <alt-photo-process-l@sask.usask.ca>
>> Sent: Wednesday, January 29, 2003 8:54 AM
>> Subject: Re: sun vs. UV lights in cyanotype
>>
>>
>>> If James really says that I think he is wrong. With all of the UV
>>> processes I have used the sun gives greater contrast than the UV box.
>>> But even with the sun there is a marked difference in contrast
>>> between exposures made in the shade (greatest contrast) with the
>>> contact printing frame pointed at the north sky, and those made with
>>> the frame pointed directly at the sun (less contrast, but sill more
>>> than with the UV box).
>>>
>>> Sandy King
>>>
>>>
>>>
>>> >Do those who do cyanotype regularly find the sun gives less
>>> contrast than
>>> >the UV box? Christopher James says this--that you get a longer
>>> tonal
>> range
>>> >in the sun and hence lower contrast.
>>> >Chris
>>>
>>>
>
>
--------------
Tom Ferguson
http://www.ferguson-photo-design.com
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