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Dave nails the DPUs on the heavy westbound SLPKSCO1-13K over the Pecos River Bridge in Ft. Sumner, NM. The stack train was a monster at 10,000 tons and 10,250 feet long running in a 3x2 configuration. In the background, the new bridge can be seen going up to the west of the existing bridge.
Governor Phil Murphy promotes the U.S Census count alongside Mayor Stack in Union City on Tuesday, September 22, 2020 (Edwin J. Torres/ Governor’s Office).
I'm sure you've seen people making a human pyramid many times, but have you ever seen a horse-man-horse-man stack, huh?
South Stack Lighthouse, Anglesey.
South Stack is set in a spectacular location to the north-west of Holyhead. The lighthouse acts as a waymark for coastal traffic and a landmark and orientation light for vessels crossing the Irish Sea to and from the ports of Holyhead and Dun Laoghaire.
History of the lighthouse
In 1645 when lighthouses were privately owned, King Charles II was petitioned for a patent to build a lighthouse on South Stack. The request was refused. However, 143 years after the original petition, Trinity House leased South Stack island and construction of the lighthouse commenced. On 9 February 1809, the station's oil lamps, designed by Daniel Alexander at a cost of £12,000, were first lit. In 1828 an iron suspension bridge was built to replace the rope catwalk that originally linked the lighthouse to the bottom of the 400 steps down the cliff face.
This was one of the many changes that have taken place at South Stack since 1809. The lights regularly became more efficient and in 1938 electric power replaced the oil that powered the lamps. In 1964 the iron bridge was taken down and a new one of aluminium was put up in its place.
The lighthouse was automated in 1984, and the keepers withdrawn. Today, the lighthouse is monitored and controlled by computer link from Trinity House Operations Centre in Harwich, Essex.
A complete coincidence shot. We've got a B-17 with me-109 escort (not something you'd have seen back then!), a C-17 and then a commercial airliner in the distance.
Stacker is a super fun and challenging prize game. To play, you must "stack" the light blocks. To win the grand prize you have to stack the blocks all the way to the top. Come to Funspot today and see if you can win!
Sweet little bunnies all stacked up... this necklace was another special order for a customer. What could be cuter!? :-)
Designed to stack vertically - this kind of illustrates it! The stacking chair forms part of our originals collection - see our website for more details on www.ercol.com The originals are a selection of our favourite pieces we've selected from our back catalogue and reissued. The stacking chair was originally designed in 1957 and was widely used in meeting rooms and schools, before the dawn of the ubiquitous polypropylene chair. Now it forms an ideal chair for when you have extra visitors and when not in use a stack of these chairs makes a dramatic display.
My husband and I enjoyed one last trip through the stacks in Hatcher. I'll miss Michigan's enormous, grand, comprehensive libraries.
1. WeMacro Focus Rail
Canon MP-E 65mm - Canon 80D - Yonguno YN24EX - f5.6 - 193 micron units - 21 stack
The WeMacro Focus Rail offers the finest degree of control. The lowest increment can be as low as 1 micron. Although this degree of control may be needed for magnifications of x10+ - for insects at 5x - 62 microns is ample. WeMacro provides a very useful DOF Estimates For Macro Chart. Using this method one sets the depth of field step size based on aperture and magnification. I just looked it up on the DOF Estimate for Macro Chart. For example, on an APS-C sensor using f5.6 at 2x magnification 193 micron step sizes are recommended.
Pros: Offers the greatest degree of control and maximum magnification - an incredible 1 micron
Cons: Heavy - great for studio but not to so practical for field stacking
2. Novaflex Castel Q Focus Rail
Olympus Zuiko 60mm - Olympus STF-8 - f5.6 - quarter mm increments - 16 stack
There is always the good old fashioned way of manually stacking using a focus rail. Although much slower than using an automated method it does provide the satisfaction of being able to see the focus with each turn of the focus knob. With care and attention manual focus stacking can be suitable for maximum magnifications of 5x.
Pros: Area of focus can be clearly seen on-the-fly and with each turn of the focus knob.
Cons: Slow - by the time the stack is completed there’s a good chance the subject will have lost patience and moved
3. Olympus E-M1 in Camera Stacking — Olympus Zuiko 60mm - Raynox dcr-250 - Olympus STF-8 f.5.6 - Differential 8 - 8 stack
By far the quickest method and great for taking stacks in the filed. The camera generates 8 jgs and from these a final RAW composite is made. Alternatively one can bracket up to 99 images and have these imported into stacking software, such as Zerene Stacker. The main drawback of this method is that you have to estimate the focus point by setting a ‘differential’ between 1 - 10. 1 represents the smallest of increments and 10 the largest.
4. Olympus E-M1 in Camera Stacking — Raynox dcr-250 - Olympus Zuiko 60mm - Olympus STF-8 f.5.6 - Differential 2 - 8 stack
As can be seen, a diff of 8 provides substantially more depth of field than a diff of 2 (where only the mouth parts of the dragonfly exuviae are clearly in focus
Pros: The lightest and quickest method of all. Great for stacking in the field.
Olympus E-M1 with Olympus Zuiko 60mm lens and STF-8 twin flash weigh just under 1 kilo. Compare this to my Canon 5D and Yonguno YN24EX on Canon Speedlite Bracket SB-E2 weighing in at a whacking 3 and a half kilos!
Cons: The amount of focus increments needs to be approximated from a differential of 1 - 10. One can’t set the focus starting and ending points as with the WeMacro Focus Rail nor see what’s in and out of focus - as with manual stacking.
My attempt at (faked, because whos got all night to do this stuff for real!?) star stacking, from one original 10 minute exposure, stars were copied and rotated along there original path to simulate a longer exposure/multiple stacked long exposures
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