(12C) Hyperfocal Distance

[Gamo]

Hyperfocal Distance is the closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp.
When using hyperfocal distance, you are focusing the lens to a particular distance determined by the focal length and Aperture combination that you are using to ensure that everything from half the hyperfocal distance to infinity is acceptable sharp.


Formula: H = (f^2 / Ac) + f

H - Hyperfocal distance in millimetres
f - Lens focal length in millimetres
A - Aperture the f-number
c - Circle of confusion in millimetres

The Circle of Confusion size that you need to use in the above formula are as follows, these camera formats are used mostly by digital SLR

- Full Frame Camera (36x24mm) = 0.03mm
- Sensor with 1.3 times crop factor of Full Frame = 0.023mm
- Sensor with 1.6 times crop factor of Full Frame = 0.019mm

How to input information:
1. Store sensor size factor to Register 2 (STO 2)
2. Input Lens focal length
3. Input Aperture (f-number)

Program:

Code:


01 STO 1
02 X<>Y
03 STO 0
04 RCL 0
05 ENTER
06  x
07 RCL 1
08 RCL 2
09  x
10  /
11 RCL 0
12  +
13 EEX
14  3
15  1/X
16  x
17 GTO 00

Example:
You decide to shoot the scene with a 35mm lens with the Full Frame camera. Lets set the Aperture at f/11 What is the Hyperfocal Distance in meter?

0,03 STO 2 > 0,03 // Full Frame camera sensor size
35 ENTER 11 > 3.75 // 35mm Lens with f/11 Aperture

Remark: This program convert millimeter to Meter as a distance unit.

If you focused your lens at 3.75 meter and used an Aperture of f/11 with 35mm lens everything from half of the hyperfocal distance (1.87m) till infinity will be rendered acceptable sharp in the photograph.

Gamo