Curved Field vs Flat Field projector lenses

I was looking thru Adorama's page and came across two Kodak projector lenses.
One was a 102/2.8 "Curved Lens" the other a 100/2.8 "Flat Lens" and they both
had similiar numbers and the same selling price. Please help me understand the
differences in these lenses and their different uses.

Regards,
Gary

 

If you are projecting onto a flat screen then a flat field lens..

 

I second that.

With CF lenses and current generation slide mounts you will either
have the centre of the image or the periphery in focus - and it gets
boring (quite quickly) playing with the focus.

Jonathan

 

Curved field lens.. I guess a curved film .( but curved in the correct
direction the centre of curvuture must be towards the lens) is projected
onto a flat screen .
optically you have the same a flat film produced points of focus in an arc.
Curved film -> Flat sceen or Flat Film -> curved screen --- then who has
curved screens.


where as a flat field lens produces pints of focus from a flat film and then
on a flat screen
Flat Film -> Flat screen

Ok I'm being daft no offence to those who still believe the world is flat
unless viewed through a curved field lens

B


..