Practice question · Put in order
Arrange the steps of pre-setting a lens for street work by the hyperfocal method in the order they are carried out.
- Check that the shutter speed still available at that aperture is usable
- Double it, since the near limit lies at half the hyperfocal distance
- Set the focus ring to that hyperfocal distance and leave it there
- Find the aperture whose hyperfocal distance for this lens matches that figure
- Decide the nearest distance that must come out sharp
Hints
- The requirement comes before the aperture that satisfies it.
- The last check is the one that decides whether the whole scheme is workable in the light you have.
Show the answer
- Decide the nearest distance that must come out sharp
- Double it, since the near limit lies at half the hyperfocal distance
- Find the aperture whose hyperfocal distance for this lens matches that figure
- Set the focus ring to that hyperfocal distance and leave it there
- Check that the shutter speed still available at that aperture is usable
Why
The last step is where the method usually fails. A near limit of one metre on a 35 mm lens demands a very small aperture, and in dull light the shutter speed that goes with it is too long to hold, so the honest answer is often to accept a nearer limit of two metres rather than to pretend the exposure works.
Practise Lenses, Field of View and Depth of Field
The app has 7 more questions on this lesson, and keeps your place in the course. Photography I is free to start.
More questions on Lenses, Field of View and Depth of Field
- A landscape photographer with a 35 mm lens wants everything from a few metres away to the horizon acceptably…
- A 35 mm lens is set to f/8 on the 24 by 36 mm format, with a circle of confusion of 0.03 mm. What is its…
- Which of these increase the depth of field in a photograph?
- Sort each focal length by the class it belongs to on the 24 by 36 mm frame.
- A lens is described as 'normal' relative to the format diagonal, not because of an absolute optical constant.…
- The 24 by 36 mm frame is the reference for calling a 50 mm lens normal. What is the diagonal of that frame,…