View allAll Photos Tagged Stack
Sea Stacks, Bandon Beach, Oregon.
This image was shot during the early morning hours. At this time, these sea stacks were perfectly lit up with an orange glow. The early morning sun was casting long shadows over the beach and the sky started to brighten up with a typical blue hue. I used a HDR image for the foreground that provided the realistic sharp image I was looking for. For the sky, I used a frame that was under exposed two stops. I composited these two images in normal blend mode in CS6. For a change, I did not overwork this image and I left it as real as I could. A lonely photographer (DW) gave a much needed scale to this image!
Please visit My WebsiteF11.
his photo was taken at thursley common on the 18th July 2017.
This is stacked from 3 images using my Olympus omd 1 mark 2 and the Panasonic 100-400 lens
I have been promoting noise reduction by stacking for years, but while I was able to recommend "Starry Landscape Stacker" for MAC users, there was no easy to use Software for Windows.
This has changed lately, with the release of SEQUATOR, a very easy to use program for stacking untracked nightscapes (for noise reduction) and the best of all: It is freeware!
sites.google.com/site/sequatorglobal/home
So far, I have been using fitswork, a dedicated software for stacking tracked star images. While I learned to use it for untracked images as well, this process is painfully slow. It would therefore be immensely helpful if SEQUATOR was able to perform as beautifully as fitswork, without all the slow manual interventions needed…
Today, I was able to do my first test of SEQUATOR. To see how it performs, I did a side by side comparison with an image I already processed with fitswork.
First I had to find an untracked image sequence. I have been doing mainly tracked shots lately, but I found my Bisti Eggs image which I shot from a fixed tripod:
To get a meaningful comparison, I decided run SEQUATOR with the same preprocessed TIFFs I have used for stacking in fitswork and publish some 100% crops taken from the resulting TIFFs right out of SEQUATOR and fitswork and without further processing. SEQUATOR has several options for stacking, but I found that “Freeze Ground”, “Auto Brightness OFF” and “High Dynamic Range ON” worked best for me.
As you can see, SEQUATOR does an extremely nice job. There are no star trails and no stacking errors and I really like how the foreground and the horizon are razor sharp. Very impressive indeed!
On closer scrutiny, the SEQUATOR result has a tad more saturated colors than my fitswork resut, but selecting “High Dynamic Range ON” avoided burning the stars. The increased saturation leads to slightly increased color fringes around the brighter stars, but this would have happened with the fitswork image as well during post processing and there are techniques to reduce this effect during processing.
SEQUATOR is really easy to use and it took me less than 5 minutes to produce the result, while my normal workflow in fitswork takes about 3 hours to arrive at the same stage.
Conclusion:
I can highly recommend SEQUATOR! If I ever have to process an untracked image sequence again, I use SEQUATOR instead of my fitswork workflow.
On Windows, it is by far the easiest to use and fastest stacking software for nightscapes and produces very good results. Even beginners can immediately produce excellent results. There are no excuses anymore for noisy single shot nightsapes… ;-)
PS:
1. Of course I still highly recommend using a tracking mount to achieve “deeper” sky exposures, by using lower ISO and higher exposure times. This means that you have to shoot the foreground separately with your tracker off and merge the two exposures during post processing. For this techique SEQUATOR might not be the best software out there, but to stay fair, that is not what it was built for…
2. Here is a very nice quick tutorial for SEQUATOR. The only point where I disagree with Mike, is that for better sharpness and no burned highlights, I recommend to use HDR instead of Auto Brightness.
It was a morning and we just woke up, I started to play with wood and stacked two of them like this.
one of two 600-ft+ stacks at a closed power station. the climb up here was the first that ever made my ears pop.
i spent a couple hours on top, watching some nearby emergency vehicles make their way through the plant, wondering if they were for me. at one point, i climbed up from the top platform to the foot-wide rim, but actually experienced a panic attack (rare, for me) and had to get down before i froze in place.
it turned out that the emergency vehicles were using a route through the plant to bypass a low clearance obstacle introduced by a nearby industrial pipe bridge. phew.
Palmer, Alfred T.,, photographer.
Smoke stacks
1942
1 transparency : color.
Notes:
Title from FSA or OWI agency caption.
Transfer from U.S. Office of War Information, 1944.
Subjects:
World War, 1939-1945
Smokestacks
Industrial facilities
Format: Transparencies--Color
Rights Info: No known restrictions on publication.
Repository: Library of Congress, Prints and Photographs Division, Washington, D.C. 20540 USA, hdl.loc.gov/loc.pnp/pp.print
Part Of: Farm Security Administration - Office of War Information Collection 12002-28 (DLC) 93845501
General information about the FSA/OWI Color Photographs is available at hdl.loc.gov/loc.pnp/pp.fsac
Higher resolution image is available (Persistent URL): hdl.loc.gov/loc.pnp/fsac.1a35072
Call Number: LC-USW36-376
The swell ended up being more mild than I thought. Still was happy to snag this pano on the way to a clients office.
I need to get down to the gong when it is really pumping. This was a 4.6m swell but coming from the south so the headliand blocked it.
A stack of multiple frames shot on the XF35mm F1.4.
About equatorial mounts and their maintenance
Credit: Giuseppe Donatiello
The Earth rotates on its axis at about 465 m/s (about 1,670 km/h) at the Equator. This is a remarkable speed that we can perceive by watching the setting Sun disappear behind the horizon in a few seconds.
It is more difficult to perceive the rotation by looking at the stars without having a reference, however a trained eye is able to notice the slow and constant movement.
We notice this when we try to take a photo of the night sky, especially with focal lengths greater than 50mm. With panoramic lenses, in fact, it can take several seconds before recording the blurred stars with the camera on a tripod.
Even with a small telephoto lens, 2-3 seconds can be enough to have annoyingly stretched images. With longer exposures, you even get dashes of length proportional to the seconds used. With focal lengths of about a meter and above, the images will be stretched by just a fraction of a second, assuming that the brightness of the sources is sufficient to record something.
Even the brightest stars are damned faint, so it is mandatory to take exposures of a few seconds or more to capture their light. The problem is that the Earth rotates in the meantime and, if we do not compensate for this movement, they will produce marks on the sensor with a thickness proportional to their brightness. It may seem like a simple task but it is not.
The first step is from a fixed tripod to a device that allows us to replicate the Earth's rotation. In essence, the device must give the optical/photographic complex a movement from east to west equal to the Earth's angular rotation speed, with the greatest possible precision and in such a way as to keep the source virtually still on the sensor. This device is called an equatorial mount.
An equatorial mount has three degrees of freedom and allows us to tilt the hour axis, arranging it parallel to the Earth's axis. The hourly movement is instead entrusted to a motor capable of giving the axis an angular speed equal to about 15°/h.
If all the settings have been done correctly, we will get an image like the one below, with the stars and the planet Mars at the center of the Presepe cluster still. Above, however, the motor was deliberately "forgotten" to be turned off and the stars produced dashes, as explained above.
As we can see, even 30 seconds of exposure are barely enough to show the brightest stars in the cluster. To capture the very faint light of nebulae and galaxies, it will therefore be necessary to collect photons with a certain number of shots that we can add together with specific software. This allows us to improve the signal/noise ratio and have richer images.
The untracked images are not "defective" or "wrong". Indeed, we can exploit the Earth's rotation to take creative shots that recall the passage of time. A "strip" is also useful for estimating the brightness of a source by comparing it to others of known brightness: the eye estimates the differences on dashes better than on points.
With this method I estimated, for example, the magnitude of the supernova in M101 at 10.6, a value very close to that recorded with photometry, just to remember that astrophotography is primarily an investigative tool.
A good astronomical photograph is always the sum of knowledge, technique, experience and also creativity. Always have respect for it even when the result may seem unflattering.
Among the natural rock formations, there is stonework that was carried out by convicts who cut and stacked the stone blocks to build the pathways.
Firework display from Paignton Seafront.
Please visit my Facebook page at the following link - www.facebook.com/RTA.Photography99
Stack of an interesting looking fly.... maybe an antlion?
51 image stack with reversed el nikkor on full extension of bellows. 3 ikea jansjo's used.
Smoke Stack. Back in the olden days (when I was a kid) it was brick right to the top& I swear you could see it all over the neighbourhood.
If you like my work click the "Follow" button on Flickr.
Other places to see my work rumimume.blogspot.ca/, Google+ google+, twitter
My first attempt at stacking multiple images of the orion nebula.
Using my Nikon D500 and the Nikon 500mm f/5.6 PF lens manual focus on a static tripob, 125 images @ 1 sec and ISO 5000.
I had to realign the comp every few shots to keep the target in the center of frame so that the stacking software didn't have to work too hard, software used was the free Sequator program.
bring this back around for the Digging in the Archives Tuesday group :)........the URL is here, if you'd like to add a picture or 2 :)
www.flickr.com/groups/2730574@N22/
29/365.........
~~grinning~~
ANSH scavenger20 Stacked
1171/10/30
The morning of July 20, 2019 finds eastbound double-stack train 294 (Chicago, IL - Elizabeth, NJ) charging through Annandale, New Jersey on the former Lehigh Valley mainline.
The stone piles popular in many traditions of Buddhism, it is said that first stupas were simply stacked stones. There are some legends of "saints" hiding teachings and sutra translations in mountain altars to be discovered hundreds of years later, which were just stones stacked up beside paths. For some these also accompany the offerings to the to the Buddhas and Bodhisattvas implying that the strength of the offering is in the intention, not the ornateness of the altar on which we place it.
Due to the work and personal commitments it has been a long time that I logged into Flickr and I think this will continue on for a while and I will stay away for some more time. This is my offering to all my Flickr friends. Please accept my apologies for not visiting your stream or not responding to your comments. Unfortunately my absence will continue for some more time, please bear with me for a while. Have a great time and a wonderful time.
My Facebook page:
LVRM 130 enters River Yard in Bethlehem, PA with their intermodal set-out for NS in tow as the forlorn stacks of Bethlehem Steel stand in the background. September 15, 2018.
GX80 mit Olympus 60 mm Makro + Raynox 250 + Kenko 10 mm Zwischenring - Post-Focus Stack - LED Licht
Fundort: Deutschland - Bielefeld - auf meiner Natursteinmauer - 16.11.2017
Missing sector spider - Xygiella x-notate on the greenhouse glass. Focus stacked using zereneMissing sector spider - Xygiella x-notate on the greenhouse glass. Focus stacked using zerene
This image was taken from about 2 dozen stacked images of a fire sky sunrise: www.flickr.com/photos/79387036@N07/38659797831/in/photost... and darkened in Photoshop.
I like producing these quasi-abstracts because it requires a balance between the right number of stacked images and the speed of the clouds between each frame. I never know what the end product will look like and am always surprised.
Lightening stacked clouds often result in a more look of a star field when warp drive is engaged: www.flickr.com/photos/79387036@N07/37893063574/in/datepos...
Darkenng stacked clouds show more variability and can be more interesting as colors explode across the spectrum.
In any event, fire sky clouds are the best for using this technique.
Try it out. It's a fun way to create with the colors nature provides us.