By Ken Hubbard
When capturing images with a macro lens, such as the Tamron SP 60mm F/2.0 1:1 Macro, focus is always critical. As with any lens, the closer you physically move towards your subjects the shallower depth of field becomes. Since you can be as close as 9 inches to your subject (measured from your camera sensor to the front point of your subject) with this macro lens, depth of field is extremely shallow. Now, the test is how do you control that depth of field and keep as much of your subject in focus as possible? For this blog I will start with a somewhat flat surface subject, a very small fern growing on a split rail fence. I position my camera and lens so that the front element of the lens is parallel to the flat subject, being the rail and fern. With the lens and subject now being on the same focal plane, no part of the subject (corner to corner) is any closer or further away to the lens, allowing for a in focus image through out. If I was off parallel (Lens to subject), part of the subject would be closer and part would be further away, causing some of the image to be out of focus. See diagram and image below.
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