A
Abbazz
Guest
Modern digital video cameras -- like most point and shoot digital still cameras -- use very small sensors, therefore their lenses have very short focal length and extended depth of field. Users of these video cameras wanting to shoot with a reduced depth of field can use lenses designed for 35mm full frame SLRs, with the help of a specific device which projects the image delivered by the 35mm lens a ground glass disc. The video camera then records the image projected on the ground glass, which retains the original specifications (depth of field, angle of view) of the 35mm lens. It means that a 50mm F/1.2 lens still acts as a normal lens with an angle of view of 40° horizontally and a super shallow depth of field when used wide open. In order for the grain of the ground glass not to appear on the final image, the disc is rotated at high speed during filming.
There are some commercial devices based on this principle, like the M2 made by redrockmicro, but they are specifically designed for video and very expensive. I was wondering whether it would be possible to build a similar device in order to retain the original focal length of the lenses when used on 4/3rds cameras. It seems to me that it would be feasible to devise a contraption based on a disc made of fine grain ground glass and rotated by a high speed motor. Of course, the maximum shutter speed on the 4/3rds camera would be limited, due to the necessity of blurring the grain of the ground glass.
In fact, I have found this webpage, which devises the construction of such a contraption for use with a movie camera. It seems quite feasible. Do you think it could be worth the effort to build it if I want to use it with my E-P1? In a world, what kind of image quality to expect from such a device?
Cheers!
Abbazz
There are some commercial devices based on this principle, like the M2 made by redrockmicro, but they are specifically designed for video and very expensive. I was wondering whether it would be possible to build a similar device in order to retain the original focal length of the lenses when used on 4/3rds cameras. It seems to me that it would be feasible to devise a contraption based on a disc made of fine grain ground glass and rotated by a high speed motor. Of course, the maximum shutter speed on the 4/3rds camera would be limited, due to the necessity of blurring the grain of the ground glass.
In fact, I have found this webpage, which devises the construction of such a contraption for use with a movie camera. It seems quite feasible. Do you think it could be worth the effort to build it if I want to use it with my E-P1? In a world, what kind of image quality to expect from such a device?
Cheers!
Abbazz
