Hello,

I'm using the lumenlab fresnel's and a vari triplet projection lens with a focal length of 285 - 330
My projection is bending on the sides (left and right) but the the entire image is shown.
When i want turn the projection lens closer to the 2nd fresnel to get a sharper image, the projected screen bends even more.

The middle of the projected screen is not bend and is straight but the more you go to the left or the right the more the images is bending

Is the focal length of my projection lens to short ?
and would a 310-360mm projection lens fix this problem