Depth of Field Adapter on Steroids

fferreres wrote:

Tons o Glass 0 Class wrote:

Thanks Tom; hopefully my explanation is sufficient to now post his video:

https://youtu.be/9cT0jXI7l4E

While I agree that as a mod you're not obligated to watch, I believe you and others here will enjoy it!

That's a lovely video. No wonder the person has so many followers. The idea of shooting with a lens with a big image circle is something that I've been looking forward for a long time. I had not noticed the idea of a double fresnel lens to get most all the light. That was a mayor roadblock. Of course, the resolution will be low but the larger the screen, the higher the resolution of the capture if the fresnel is high quality.

Yup it seems like going big is the right idea.

These very fast projector for large venues are ideal,as they'd give looks for impossibly fast lenses. Position closer to the camera and the DOF is useless. But position far away, and they are another thing.

Most large format lenses I have would not look as ultra fast lenses. For example, something 6.8 covering 8x10, say a 12" dagor 6.8 will look like 50mm f1.2, and these are usually shot at f11 to f64. An f4 with 8x10 is more interesting, if DOF is the thing, with a look of about f0.7.An f2.5 will look f0.44 and f2 like f0.35. But one needs a long FL. As I said, 300mm is a normal lens.

I'll have to whip up a spreadsheet to plug in specs for potential lens choices.  I'm very unfamiliar with the large format lens scene.  Rattle off a few if you think of any!  The ultra fast look is really the main draw for Matt's rig (where else would you get it?), so yeah the Dagors might not be compelling enough when one can just slap a fast fifty on a full frame camera and take it anywhere with ease.

Nikon's Apo-Nikkor lineup is slower than Matt's Ross 17" but some of them have some massive image circles, so a similar f-stop equivalent could be had, but the rig would be just too dang big.

I have a Kodak Aero Ektar 178/2.5 on one of my shelves that could be a candidate for a smaller rig, but screen grain might be an issue on the 4.5" x 4.5" plane it was designed to cover (48mm f/0.7-ish equiv.).  Close-ups have more coverage, good enough for 8x10" from what I can gather (24mm f/0.33-ish equiv. - could be interesting for life-size headshots?).

I really like this very simple camera. No movement, motorized, the idea of double fresnell and a housing to host the camera as well. This is likely viable even if eccentric, and could be made relatively lightweight. Can be a fun camera an equiv. f0.4 lens.

Thanks for sharing.

The project is a culmination of so many things I find fun - 3D-prints, tinkering, basic electronics, adapted lenses, photography... had to share!