Re: [Largeformat] Converting a camera to an enlarger

["Jim Bancroft" <bancroft@home.com>]

From: "Jim Bancroft" <bancroft@home.com>

Hi-

Why not use a slide projector as a light source used at a distance which
focuses the image size to that of your  negative.  With a 35mm projector the
distance for a 4X5 is only a foot or 2 so you should be able to use a
cardboard box with cut outs between the projector lens and the negative to
minimize stray light.  The projector bulb is a fair "white light" source and
is cooled.


jim

....>>
>> we had this thread before ... I'm trying to use my camera as a
>> (horizontal) enlarger. For illumination of the negative I built
>> a wooden box with a lamp at the one end and a piece of frosted,
>> opaque glass at the other end. I tried different kinds of light
>> bulbs. One is a 150 W enlarger light bulb, which results in a
>> somewhat low output of light. Another one is a standard 75 W halogen
>> light bulb with built-in refelctor (the flood light type, not a
>> spot !). This gives nice bright illumination of the negative.
>> However, I have two major problems to solve:
>>
>> 1. Heat. Especially with the reflector, the glass and the negative
>>    get very hot with time.
>> 2. Uniformity of illumination. All types of bulbs I've tried so far
>>    give a quite distinct fall-off towards the edges.
>>
....