Lens and Shutter Data:
KODAK COMMERCIAL EKTAR LENSES
8½-inch f/6.3; 10-inch f/6.3; 12-inch f/6.3; 14-inch f/6.3
These lenses meet the most critical requirements in color photography and are recommended for making exposures with Kodak color sheet films or for making color-separation negatives. It follows, therefore, that they are also suitable for black-and-white picture taking. They are not recommended for enlarging or projection printing. When the lenses are used at maximum aperture, the image size on the ground glass should not be larger than about one-third the subject size. At small apertures they perform satisfactorily even at lens-to-subject distances giving an image size of about 1 to 1.
The Kodak Commercial Ektar Lenses are exceedingly well corrected for lens aberrations, such as coma, astigmatism, curvature of field, and spherical and chromatic aberration, both lateral and longitudinal. The lenses are Lumenized.
The four f/6.3 lenses described here cover at full aperture an angle of 53° and at small stops an angle of 64°. For example, the 14-inch f/6.3 lens covers adequately the recommended negative size (8 x 10 inches) at maximum aperture with allowance for full use of the rising and falling front and swing back. At apertures below f/16 its 64° covering power permits its use on an 11 x 14-inch camera but without allowance for swing back or rising and falling front.
Kodak Commercial Ektar Lenses are available in shutter or in barrel.
Marked Apertures: f/6.3, f/8, f/ll, f/16, f/22, f/32, and f/45. In barrel, the diaphragm setting ring has click stops. As each marked f-number passes the index mark, a distinct click is heard and felt.
Focal Length, Maximum Recommended Negative Size, and Angle of View:
(Lens Focused at Infinity)
Infrared Focusing: Lens should be extended from visual focus as follows:
Shutter: Ilex Syncro with built-in flash syncronization. Speeds
Diameter of Lens Board Mounting Hole:
Size of Kodak Combination Lens Attachments:
Hyperfocal Distance: Same as near limit of depth of field. See below.