To develop its recommendations, Photo Helper goes internally
through these steps:
- It ensures the subject is in focus. It does this by
calculating the aperture required for the subject to be within
the depth of field range (or to ensure that the subject is
beyond the hyper-focal distance).
- It avoids motion blur. By considering the movement in the
scene, camera parameters, and distance to the main subject, it
recommends a shutter speed fast enough to avoid motion blur.
- It avoids camera shake and graininess. After addressing the
often needed trade-offs to maintain the required exposure,
Photo Helper matches the resulting settings against commonly
used rules-of-thumb to detect any potential problems.
At times, conditions are poor and it will be impossible to
obtain a set of recommendations that accomplishes all of the
above. In this case, Photo Helper will display its best
recommendation and will highlight related warnings.
The sliders in the Fine Tune area can be used at any time to
change the parameters and deviate from the suggestion - Photo
Helper will monitor your changes and instantly display
In most cases, you will not have an Exposure Meter with you
so the value entered in "Lighting" will have to be an
approximation. This is why Photo Helper normally suggests using
either "Aperture priority" or "Shutter priority" modes on your
camera (vs. "Manual")- that way the camera can adjust slightly
the recommended settings and achieve a good exposure for the
A common rule-of-thumb to avoid motion blur is to use a
shutter speed of 1/x; where x is the 35-mm equivalent of the
lens size (i.e. a 100mm lens on a camera with a crop factor of
1.6 would require 1/160s shutter speed). However, this is also
influenced by (a) movement in the scene; and (b) distance to
the subject, as angular velocity will increase when the subject
is near. Photo Helper considers these parameters when creating
Photo Helper will issue a "Shake" warning when the shutter
speed falls below 1/60s, and a "Tripod" warning when it is
slower than 1/4s. However, if the lens you are using has Image
Stabilization (IS) capabilities, it might be able to produce
adequate photos at slower speeds.