No matter where one lives, you are surrounded by the small and extraordinary – insects, spiders, flowers. This is a wild world in every sense but easily overlooked because the inhabitants, like most life-forms on Earth, are very small. Macro Photography allows you can peer into this world, witness and document incredible species with behavior that most people never see. At Learn Macro, we share nature & macro photography ramblings from across the Atlantic. —Clay Bolt (Montana, USA) and Paul Harcourt Davies (Orvieto, Italy).
Focus Stacking in the field has become a practical reality for me thanks to what Panasonic calls 4K post focus, avaiilable in the GH4 and several other models…..
The very first time I saw the remarkable images that a scanning electron microscope could generate I was completely hooked. The Sunday Times colour supplement, a journal of quality in those pre-Murdoch days published a series of images by the remarkable Lennart Nilsson. Every detail was revealed in sharp focus by taking layers within the target and building up an image created via reflected electron beams from these. I dreamed of one day being able to do something similar with natural light and with living material, not the dead specimens coated with a thin layer of gold deposited in a vacuum chamber…now I can.
The Revolution: 4K post focus in the Panasonic GH4 (and various other Panasonic cameras that boast a 4K video capability)
For the past few weeks I have been like a kid in the proverbial candy store using a feature of the Panasonic GH4 called 4K Post Focus. The result has been some superb stacked image results.What this camera does differently is to use its high resolution video capability (something for which many pros have bought it) rather than a burst involving the shutter. The 4K video mode employed allows super detailed video for the 4K refers to the approximate value of the long edge of each frame captured.
a. The frame rate is 30 fps and the exposure of individual frames is set beforehand. I use f/4-f/5.6 as the marked lens aperture for this tends to cover the proverbial ‘sweet spot’ where the lens has its optimal performance.
b. You also get the Bokeh associated with the wide aperture and this gives soft backgrounds that accentuate the detail of the final stacked image
c. I then adjust the ISO between 200 and 400 (say) to get a shutter speed that will freeze movement. The stacking software can cope with tiny movements between frames when it aligns images but the more you can cut down movement of subject and camera the better. To this end I always use a tripod and a flexible arm when possible to steady plant stems during the scanning of the subject and focus shift by the camera. Read More