Memorizing f-numbers is sometimes argued as being useful. I disagree, while knowing the f-stops can be useful, there’s simply no reason to spend time memorizing them for the sake of memorizing them.
The Ec-S Super Precision Matte focus screen is one of 12 user interchangeable focus screen for the Canon EOS-1 series SLRs. The Ec-S screen is designed to provide a higher level of precision for visualizing the shallow depth of field associated with fast lenses.
The traditional process of AF adjustment is complicated and requires skill and guesswork in interpreting the results. However, there is an alternative method that works just as well but requires a whole lot less guess work as long as your camera has live view.
A few frames of a Crested Caracaras seen at Viera Wetlands, in Melbourne Florida, in early December 2009. The Crested Caracara, a member of the falcon family, exists in central Florida isolated from the rest of the Caracara range. These birds of prey are currently a threatened species, primarily due to loss of habitat.
