Since you used two 8"
Lekolites, did you make one or two
LINNEBACH projectors? A
unit with no
reflector or
lens, and per your own words no
reflection and
refraction, cannot have a
focal point. The best commercial Linnebach projectors were made by
Kliegl Bros. as late as the 1970s, and used a 65V, 2100W T24
Mogul Bi-Post lamp. A dimmable
transformer was included. The slides were huge, maybe 24" x 36".
I made two of them - the
cannon lower part of the fixtues
lens train from
gate to
gel frame removed on them is about 16" wide.
Reflector removed you have a shielded 16" single focus
filament source projecting against a
pattern. Only from there is a question of
filament efficiency, projection and frame that’s optically aligned. This given most of the
fixture removed.
As said, what I did was not optically a slide projected, more like an
image projected of
fitting to the ethereal nature of the shows.
Ah.... “Cannot have a
focal point” Not my words certainly given many lighting fixtures of the past without reflectors and or even some without lenses -
focal point is the
filament. That’s a simple answer common to the concept of this type of
projector in why you remove them so as not to get double and more images or why one puts a
gel where its located.
Imagine this slide where it’s placed at the place where the beam is most efficient to project that beam of light out of the
filament only source. Lots less efficiency but also a sort of naturalistic type of projection.
My slides were about 24" square also.
Main concept... it worked and looked darned good! Could do so especially with a
Fresnel but also with the lower half of a
Leko.
It’s a concept in a lively artistic projection. If you want reality, go projection - just calculate properly the exact angles and have a wide enough
fixture or get stuck projecting from the front instead of adjusting the plate to the angle of projection you need. Sure what’s close will be more refined which you can correct for but overall, worked really well. Does work, just gotta be there in trying such a thing. Huge silide.... yep, it was, on the other
hand a
bit more easy to paint.
