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Pentax 645D
Pentax 645D

Autofocus Assist With Manual Focus Lenses

To its credit, the 645D provides focus confirmation in the viewfinder with any lens (“focus assist”).

Yet with all the lenses I’ve tried, focusing by eye is usually more accurate.

Example 1

The example shown here is typical (definitely not single case!), showing that autofocus assist is not really very usable except as a feel good feature Perhaps with AF fine focus adjust, behavior can be made useful (not yet tested).

Click to view the actual pixels crop, which shows that focus is at least 30 feet in front of the tree. Stopping down to f/8 would not save this image (if the intent were a sharp tree). I tried many other subjects, some in the sun, some in the shade, etc. Front-focus is a consistent problem.

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One test scene of many

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