Thursday, May 26, 2016
click the link).
North Coast Photographic Services in Carlsbad, California , developed the Tri-X film. They develop their black and white film in a Hostert Dip & Dunk system using Clayton F76+ developer. I found that the regular development is too contrasty, so I requested to pull one stop (or N-1). The negatives are still a bit hard but close. If in doubt, you want the development to be low-contrast or soft because you can add contrast with software adjustment later, but with a hard negative, you might have lost details in the shadows (totally black) or the highlights (totally white).
I still have a few rolls of the super fine-grain Ektar 25 color negative film in the freezer. When the Rolleiflex comes back from its cleaning and overhaul, the Ektar 25 can go on a tour of the Mississippi Delta. For more information about how a Rolleiflex works, see this older post.
Dear readers, borrow or buy a film camera and try traditional photography. The results might surprise you. You might even find it more rewarding than the "spray and pray" and instant gratification of digital imaging.
Sunday, May 22, 2016
Tuesday, May 17, 2016
Dear readers, no urban decay this time, but a short description of a hike in an amazing geological terrain.
The Upheaval Dome is a circular geological feature in southern Utah in Canyonlands National Park. There are two major hypotheses for its formation. One is that the rock strata in this area is underlain by a salt dome. The salt is slowly rising because it is of lower density that the overlying sand- and siltstones, therefore causing an circular uplift. The other hypothesis invokes an impact from a meteorite about 60 million years ago. Some of the strata near the center of the area are almost vertical, which is anomalous for this general area. At the end of the post are some paragraphs from the National Park service which provide more details. The aerial photograph above is from NASA (via the National Park Service).
Even in person, it is difficult to appreciate the enormity of this terrain. The air was brilliantly clear in April, and from the overlook, we had few references that the other side of the dome was miles away.
Photographs taken with a Nexus 4 telephone (sorry, no real camera this day). I thank Fred and Ben for being such cheerful companions.
The following information about the formation of the Upheaval Dome is from the National Park Service:
Canyonlands is a place of relative geologic order. Layers of sedimentary deposits systematically record chapters in the park's past. With some exceptions, these layers have not been altered, tilted or folded significantly in the millions of years since they were laid down by ancient seas, rivers or winds.
Upheaval Dome is quite a different story. In an area approximately three miles (5 km) across, rock layers are dramatically deformed. In the center, the rocks are pushed up into a circular structure called a dome, or an anticline. Surrounding this dome is a downwarp in the rock layers called a syncline. What caused these folds at Upheaval Dome? Geologists do not know for sure, but there are two main theories which are hotly debated.
Salt Dome Theory
A thick layer of salt, formed by the evaporation of ancient landlocked seas, underlies much of southeastern Utah and Canyonlands National Park. When under pressure from thousands of feet of overlying rock, the salt can flow plastically, like ice moving at the bottom of a glacier. In addition, salt is less dense than sandstone. As a result, over millions of years salt can flow up through rock layers as a "salt bubble", rising to the surface and creating salt domes that deform the surrounding rock.
When geologists first suggested that Upheaval Dome was the result of a salt dome, they believed the land form resulted from erosion of the rock layers above the dome itself. Recent research suggests that a salt bubble as well as the overlying rock have been entirely removed by erosion and the present surface of Upheaval Dome is the pinched off stem below the missing bubble. If true, Upheaval Dome would earn the distinction of being the most deeply eroded salt structure on earth.
Impact Crater Theory
When meteorites collide with the earth, they leave impact craters like the well-known one in Arizona. Some geologists estimate that roughly 60 million years ago, a meteorite with a diameter of approximately one-third of a mile hit at what is now the Upheaval Dome. The impact created a large explosion, sending dust and debris high into the atmosphere. The impact initially created an unstable crater that partially collapsed. As the area around Upheaval Dome reached an equilibrium, the rocks underground heaved upward to fill the void left by the impact. Erosion since the impact has washed away any meteorite debris, and now provides a glimpse into the interior of the impact crater, exposing rock layers once buried thousands of feet underground.
Upheaval Dome Today
Whatever the origin of Upheaval Dome, it is the result of erosion of a structural dome. Rock layers now at the surface within the dome were once buried at least a mile underground and are not visible anywhere else in the nearby area. While some call this feature a crater, it is not a crater in the traditional sense of the word, but simply another example of the erosion which created Canyonlands National Park.
Monday, May 9, 2016
All photographs (except the lady with the horse) were taken with a Rolleiflex 3.5E camera with a Schneider 75mm Xenotar lens using Kodak Panatomic-X film. I developed the film in Agfa Rodinal 1:50. I scanned the negatives but decided they looked a bit cold. Many years ago, I printed the frames optically (meaning with an enlarger) on Zone VI paper and toned with selenium. The genuine prints fit the mood best; there was something magical when a negative was printed on a traditional high-silver-content printing paper. So the toned frames above are scans of the paper prints.
I sold the Rolleiflex years ago, which was a dumb thing to do. So as of April 2016, I have purchased another Rolleiflex 3.5E via eBay.
Tuesday, May 3, 2016
Wikipedia, "With 21,529,464 produced, the Beetle is the longest-running and most-manufactured car of a single platform ever made."
My other article about a VW disposal yard is from Raymond, Mississippi. I need to return to see if it has changed.
Photographs taken with a Fuji X-E1 digital camera.