Lense length, DOF, AOV affected by 35MM adapters?

[Droog]

I apologize for yet another 35MM adapter question, but I am curious about the effects of the adapter as it relates to the length of the lense and the CCDs.

I realize the whole point of the adapter is to achieve the DOF of 35MM. What I am wondering is if the adapters translates the image to the CCD exactly as if it were film? For example; if I have 50 MM lense on my SLR set to T4 it will have a focal length of X. Now if I mount the same lense with the same aperature on an adapter will X be the same value on the footage that is recorded? Is the angle of view the same?

I hope my question is clear. Curiosity more than anything, but I got to wondering how well these adapters translate to the CCDs.

Thanks alot.

[PaPa]

it wouldnt work because of the size of the CCD chip, i believe its too small to have as large a plane/view to capture such depth. ( not sure the best way to explain it, to you, or to myself, i can just picture how it works )

where as the 35mm adapter focuses (shallow and deep depths of field) onto the ground glass, thats what the dvx100 captures ( with a help of a macro lens to magnify the small image being made on the GG.

[Barry_Green]

With a properly-designed, properly-engineered adapter (such as the mini35) the field of view and depth of field will be exactly the same as if that lens were mounted on a 35mm movie camera.

With the less-expensive adapters, I don't know -- your guess is as good as mine. If the designers have optimized their systems around a 24mm x 18mm image plane, then it should work. If they're not working around 24x18, then the DOF and FOV will be different.

[Droog]

I had a feeling that the adapters did not translate exactly. Most people are just going to use a monitor and work until they get the image they want anyway. I would imagine breaking out the tape measure for focus or trying to determine exact focal length may not be that feasible?

Seems like info that one should keep in mind when thinking about getting into a 35MM adapter.

Thanks guys.

[jbproflm]

I had a feeling that the adapters did not translate exactly. Most people are just going to use a monitor and work until they get the image they want anyway. I would imagine breaking out the tape measure for focus or trying to determine exact focal length may not be that feasible?

Seems like info that one should keep in mind when thinking about getting into a 35MM adapter.

Thanks guys.

I recently invested in a Redrock M2 adapter with an OCT-19 LOMO mount. When calibrating the focal length of a lens, I set up a chart and matched the full-frame on-sreen image of the adapter (including overscan) with my 35mm camera's 4:3 academy framing. (The focal plane distance from the chart was exactly the same.) This gives me a pretty accurate focal length and DOF on-screen. Hope this helps.

[Droog]

I recently invested in a Redrock M2 adapter with an OCT-19 LOMO mount. When calibrating the focal length of a lens, I set up a chart and matched the full-frame on-sreen image of the adapter (including overscan) with my 35mm camera's 4:3 academy framing. (The focal plane distance from the chart was exactly the same.) This gives me a pretty accurate focal length and DOF on-screen. Hope this helps.

The Redrock is pretty popular so its good to know that it can be setup to be accurate, or at least consistent between the formats. Thanks for the info. Glad to hear some hands on examples.