Recognizing that although I work at a school where art reign supreme here are some question related to DOF for you amusement. I forgot the answers! :) andy Quiz 4 - Depth of Field This is a quiz related to Depth of Field and Depth of Focus. Question 2: Camera lenses can be focused on many object distances at one time. True False Question 3: Increasing the viewing distance to a print increases the perceived depth of field. True False Question 4: Prints are normally viewed from a distance about equal to their diagonals. True False Question 5: The appropriate viewing distance for a 6x8 inch print made from a 35mm negative is 10 inches True False Question 6: Enlarging a negative increases the size of the circle of confusion proportionally. True False Question 7: Depth of field decreases rapidly as the distance between the camera and the subject increases. True False Question 8: Hyperfocal distance is the nearest distance that appears sharp when the camera is focused on infinity. True False Question 9: Unlike pinhole cameras lenses can only focus on one suject plane with other planes recorded progresively unsharply True False Question 10: Depth of field is the range of distances within which objects are imaged with acceptable sharpness. True False Question 11: Depth of field is directly proportional to the Circle of confusion. True False Question 12: Depth of focus is associated with placement of the film with respect to the image formed by the lens. True False Question 13: To maximize depth of field one should focus on 1.2 the hyperfocal distance. True False MULTIPLE CHOICE QUESTIONS FOLLOW BELOW: Question 14: Which of the following is not a tool that a photographer can use to change depth of in field in photographs? a: f-number b: object distance c: focal length d: lighting Question 15: In the workshop the hyperfocal distance for the Tele-Optar at an aperture of f/32 was? (in inches) a: 156 b: 342 c: 780 d: 1528 Question 16: According to the textbook the permissible circle of confusion on a print viewed at a distance of 10 inches is? a: 1/10 mm b: 1/100 inch c: 1/170 inch d: 1/200 inch Question 17: Using 1/800 inch circle of confusion instead of 1/200 inch for the 10 inch lens used at f/4 and focused at 50 feet changed the DOF by a factor of: a: 1/2 the value determined at 1/00 inch b: 1/4 the value determined at 1/00 inch c: 1/8 the value determined at 1/00 inch d: 1/10 the value determined at 1/00 inch Question 18: Camera "A" and camera "B" are identical except that the DOF scales were based on permissible circles of confusion of 1/170 inch for "A" and 1/230 inch for "B". This difference indicates that.....? a: lens "A" is better then lens "B" b: lens "B" is better then lens "A" c: the DOF scale on "A" will specify a larger f# to obtain a certain DOF than the scale on "B" d: the DOF scale on "B" will specify a larger f# to obtain a certain DOF than the scale on "A" Question 19: In order to make a 6x8 inch print from a 35 mm negative it should be enlarged: a: 2x b: 3x c: 4x d: 6x Question 20: Given any format camera extreme depth of field is associated with: a: short focal length lenses b: normal focal length lenses c: long focal length lenses d: retrofocus angle lenses Question 21: To obtain the greatest depth of field at a given f# the lens should be focused on: a: infinity b: the subject c: the hyperfocal distance d: 1/2 the hyperfocal distance Question 22: When a lens is focused at the hyperfocal distance depth of field extends from: a: the subject to infinity b: the camera lens to infinity c: from lens 1/2 way to infinity d: 1/2 the hyperfocal distance to infinity Question 23: Viewed from a 10 inch distance Depth of Field in a contact print of a 35mm negative always appears: a: larger than in an enlargement b: the same as in an enlargement c: smaller than in an enlargement Question 24: Hyperfocal distance is a function that depends on: a: Lens focal length, lens aperture and size of Circle of confusion b: Object distance, Lens aperture and viewing distance c: Lens type, lens aperture and lens focal length d: Film format, Circle of Confusion and Lens Focal length Question 125: As the specified Circle of Confusion gets smaller the Hyperfocal distance for a given lens and aperture: a: decreases b: remains constant c: increases d: varies with the film format Question 26: Depth of Focus is particulary applicable to photography of: a: 2-dimensional subjects b: 3-dimensional subjects c: inanimate subjects d: very deep subjects Question 27: The object distance at which one should focus to obtain the largest depth of field given a specific lens and f-number is....? a: infinity b: 1/2 the hyperfocal distance c: the hyperfocal distance d: 2 times the hyperfocal distance
