Motivation is a photography blog that discusses the creative aspects of photography. The posts will include thoughts about images and their interpretation, photographers and their work, technique, workflow, my ongoing projects, and perhaps even the occasional off topic rant.

More Cacti

The "Cactus Project" continues, in black and white of course!

The focus stacking that I talked about in my last cactus image has gotten me thinking much more carefully about the idea of focus in a composition. Is the image really one where I think selective focus with a limited depth of field would best portray what I am trying to convey, or would front to back sharpness better convey what I am trying to transmit? I had previously been 'bothered' when I wanted to use front to back sharpness and things were 'almost' all sharp. It's not easy being compulsive :). Now, I am more apt to use focus stacking when I seek true front to back sharpness, with the caveat being that compromise is necessary in some situations, such as where there is subject motion. I think my photo buddies and I would be willing to pay Phipps to just turn those fans they use to ensure air movement off for two hours on Sunday mornings :)

In this first photograph of Senecio talinoides flowers, I wanted the depth of field to be limited so as to have the stems and background fade away.

The Flowers of Senecio talinoides    © Howard Grill

On the other hand, in the image below I wanted sharpness throughout, at least for all the spines. That couldn't be achieved in one shot this close up because the angle the cacti were growing at precluded the option of getting the camera parallel to the surface of the 'stem'. Therefore, this image is a blended focus stack of probably 10 or so shots, each made two mm apart without adjusting the focus of the lens.


Opuntia 'Pricckly Pear' Cactus    © Howard Grill