If you REALLY want something good...

Comments

apit34356 wrote on 5/31/2005, 7:37 PM
optics 101; everyone, Vic gave a fair description of dof. An adapter can change, by spacing and addition lens, the 35mm film lens focal point. Great glass infront of poor glass, still produces poor image qty. But the world of 35mm film lens with different angles is great, a lot of choices, a lot of different "views". And the "view" is what creates a great shot / image/ picture. But since one is stuck with the CCDs in thier camera, a balance between detail and "angle of len" used must be calc out to insure "proper" capture of image. As Vic pointed out, F-stops can be a pain, lighting can be a serious issue in the area of cost, larger area in len's angle of view, more light needed, ..etc....
vicmilt wrote on 5/31/2005, 7:38 PM
Thank you Patryk Rebisz -
That footage is undeniably beautiful and confirms my theory... looks like film to me.
Do you off hand remember the lens length and f/stop you shot at?
Great stuff... amazing that it's actually DV video.
v
Coursedesign wrote on 5/31/2005, 9:15 PM
"Actually, it doesn't. It works by projecting a full 35mm frame onto a glass surface, a portion of which is then captured by the back-end camera's CCD, relative to its imaging area size. There's no such thing as an adapter that magically utilizes a full 35mm frame on the CCD of a prosumer cam -- it is, by the laws of physics, impossible to do so."

I'm baffled. The front lens projects an image circle covering the size of a 35mm frame on a ground glass. The "35 mm frame" is imaged onto whatever size CCD is in the video camera, simple case of macro photography. The DOF is 100% based on the front lens, 0% on the video camera lens or CCD size.

What did I miss from physics?
jlafferty wrote on 5/31/2005, 9:25 PM
The difference is that you're not covering the entire projected image, only a portion of it. To put it differently, it's impossible to squeeze a full 35mm frame onto a 1/3 inch CCD without losing some visual info. Vic's comment seemed to suggest otherwise.