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Depth of Field Adapter on Steroids

Started 8 months ago | Discussions thread
Tons o Glass 0 Class
OP Tons o Glass 0 Class Contributing Member • Posts: 977
Oh wait, nope...

Tons o Glass 0 Class wrote:

fferreres wrote:

Replying to myself, but actually would like to ask about the dual fresnel or higher magnification, as a solution to increase the transmission captured by the camera. I had not seen that in other ideas/ projects, and most used a simpler fresnel lens.

One Frensel lens would be sufficient to condense enough rays towards the observer to eliminate the vignetting seen on the screen as long as its focal length is short enough - viewfinders of many cameras employ one. In Matt's case it may not be possible to manufacture/source a single imaging-grade Fresnel lens that is both large enough (fast enough) and of the required focal length to suit his rig.

I thought about this a little more and made some animations (see my Visualization post), a single Fresnel only works at infinity focus. The Fresnel would need to be a zoom (ha) and/or the rear of the rig would have to adjust (zoom, refocus, move) -- let's just say it's not feasible.

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