Pentax FA 77mm Lens Test Part 2

The second part of the evaluation of the FA 77mm lens was to photograph a scene at different apertures and observe the CA/PF effects.

I set up the camera on the tripod and photographed the scene across the street.

This is what the scene looks like:

I shot this at every aperture setting for the lens. I have selected a few of them covering the range from F1.8 to F11 and show the crops around the patio railings on the top left corner of the building.

The CA/PF effects get less noticeable as the aperture gets smaller.

Here is F1.8

This of course is equivalent to a 16 inch print viewed very closely (pixel peeping). In reality the first image, even when viewed from a few feet away at an 8 X 12 size is very difficult to see the PF on the railing.

Next is F2.5

Next F 3.5

Next F5



Personally, I can accept the performance of the lens at F2.5. The picture is sharper at F5 and above, and I think I would for heavily backlit subjects which do not need a shallow depth of field use the f4 or higher aperture. I think with careful planning and understanding of the performance of the lens, the CA/PF issue can be minimized.


About petergsimmons

Global citizenship is conferred on those who have lived in a variety of countries, and who don’t identify with any one culture. I am such a person. Having lived in Jamaica, Canada and Japan, I have been exposed to First World/Third World, East and West, North and South. This has lead to a rich living experience, open-mindedness and curiosity about the world around me. This variety of living conditions in human landscapes is coupled with equally diverse travels in natural landscapes from the jungles of South East Asia and South America to the Arctic tundra; tropical beaches to the Himalayas, resulting in an incredible journey through life itself.
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