flash – Does the Nikon D3300 support high-speed sync speedlights?

High speed syinc in the case of your camera, is not limited by your camera, but by your flash.

So the answer is yes, your camera can do high speed sync (teoricly, any camera), but your flash don’t.

A High speed sync flash makes a series of flashes to make a longer duration light. In this case the point is not to have a brief fast single output but a longer one.

I can not recomend any specific flash + combination, but you can google reviews on https://www.google.com/search?q=High+speed+sync+flash+review

Panasonic FZ1000: High-speed synchronization quirks Flash FP, mechanical shutter 1 / 16000s?

Since the Panasonic LUMIX FZ1000 uses a roller shutter, there is no maximum synchronization speed; The flash can be used over the entire range of mechanical shutter speeds, up to 1 / 4000s (1 / 3200s unless stopped at 32mm equivalent 135 or more). Normally this means that high speed FP synchronization is normally not necessary. Nevertheless, FP synchronization can be activated on a hot shoe TTL Four Thirds flash (such as the Panasonic DMW-FL360L) and the flash will fire continuously throughout the exposure, just like on a camera with a focal plane shutter. This is evident in the flash which no longer freezes very fast movements when it would in normal mode.

However, I noticed a number of quirks with the flash when it is in FP sync mode (all photos taken in manual exposure mode):

  • The flash may not synchronize correctly when the aperture is wide open at focal lengths of 33 mm (equivalent 135) and less; while the flash fires, the image can be exposed as if the flash had not been fired during the exposure. This might have to do with the mechanical shutter speed 1/3200 wide open to 32mm and above. (This seems to indicate that the flash works as if the camera had a focal plane shutter with a sync speed of 1 / 125s, perhaps a dummy value communicated to the flash for compatibility purposes.)
  • Most importantly, with the shutter type (Rec menu on page 4) set to Auto, the camera allows the mechanical shutter to be used at speeds of up to 1 / 16,000 sec. , speeds which cannot normally be reached without using the electronic shutter. The flash fires and pictures taken in this mode are actually properly exposed as long as the subject is within range of the flash. These shutter speeds seem real: if the subject is out of flash range, the image gradually becomes underexposed as the shutter speed increases. Additionally, stopping the aperture affects exposure and depth of field as it normally does; faster shutter speeds do not increase the depth of field (what would be expected if the blade shutter cannot fully open at high speeds).

If the mechanical shutter can only work at 1 / 4000s, how is it possible that it will reach 1 / 16000s when using a flash in sync mode high speed FP? Is this the result of some kind of firmware problem? (It should be noted that the camera always uses the shutter with blades in conjunction with a "first electronic curtain"; there is no audible sound when a long exposure begins , only at the end of the exposure, and the shutter reopens immediately to resume live view unless noise reduction for prolonged exposure is enabled.)

The need for high-speed Internet in rural areas – Everything Else

Internet has opened a wide range of possibilities for all of us. From education to leisure, to entrepreneurship, nothing has been spared by the advancement of the Internet. But, if you live in rural areas of the country, you would surely have experienced the digital divide. While only 4% of city dwellers face Internet connectivity problems, 39% of rural dwellers face low speed Internet access issues. If you're one of those 39%, you should definitely look for high-speed Internet options in rural areas.

If you think that the Internet is just a source of entertainment and you can only watch funny videos and share memes on the Internet, you are mistaken. Entertainment may have been touched by the Internet, but it's not the only sector that has been influenced. With high-speed Internet connectivity, you and your family can enjoy many other things. Online education, e-commerce options for entrepreneurship and even for the satisfaction of basic necessities count among the most common benefits of the Internet. You can complete or complete your studies, start an online business, get products to the other side of the world and stay up-to-date with the world via the Internet. In addition, rural Internet service providers can also help you bridge the digital divide between rural and urban areas. It means not only a better standard of living for you, but also more opportunities for growth and development.

With respect to rural Internet options, there are only two pioneers working to narrow the digital divide. Looking for a reliable service provider for a high-speed wireless Internet? Well, look no further than A007 Access. They are the most reliable service providers and the affordable and accessible Internet access provider, wherever you are.

They are so confident in the impeccable services that they also offer you a 10 day trial period. In case of unexpected, when their service does not meet your needs, you can return the equipment and get a refund. However, such a situation is unlikely with their extensive network and cellular tower connectivity. You can also opt for affordable satellite internet service if the standard options do not meet your needs.

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Hotshoe Flash – Which Canon DSLRs support high-speed sync and what are the other requirements?

Cameras:

The Speedlite 430EX II manual (p.37) states that:

If you are using the 430EX II with a Type B camera (EOS TTL auto flash
camera), note the available and unavailable functions below. Where & # 39; a
The type B camera is used with the 430EX II set to auto flash, will
displays on the LCD panel of the Speedlite.

Features not available with Type B cameras:

  • (…)
  • High speed synchronization (FP flash)
  • (…)

So every Canon camera since Elan II / EOS 50 (the first with E-TTL), which was published in 1995, should support HSS. If you are not sure about your camera, E-TTL (II) is the functionality needed to support HSS.

Thanks to @Mike Sowsun for providing information on Elan II!


Flashes:

Canon (Speedlite):

The first Canon flash to support the HSS (and the E-TTL) was the Speedlite 380EX, launched in 1995. As far as I know, all Speelites have since had an E-TTL, but not all the HSS (to date, only the 90EX does not do).

Thanks to Mike Sowsun for providing information on the 380EX!

Third part (Metz, Sigma, Yongnuo, Godox, Cactus, …):

If you use a third-party flash, it may be necessary to support your current camera. However, I think Canon's flash protocol is not updated with every new camera. Therefore, if the flash requests HSS support with one of Canon's DSLR cameras, it should work properly.


HSS & Wireless Trigger:

Be aware that the support of a flash for HSS could be limited to service to the camera, that is to say when the flash is connected to the camera's shoe. Again, the 430EX II manual (page 29) says:

The wireless flash with the following settings can be done in the same way
as with normal flash shooting:

  • (…)
  • High speed synchronization (FP flash)
  • (…)

Therefore, at least with Canon flashes, it appears that you can set up a wireless HSS system. I can not comment on all the other systems available, although I can add information about Metz flashes as soon as I have time to test HSS wireless systems with them.

Creation of a high-speed Elasticsearch cluster

We are implementing Elasticsearch as a search solution in our organization. For the POC, we set up a 3-node cluster (each node with 16 VCores and 60 GB of RAM and 6 * 375 GB of SSD), all nodes acting as master node, data and coordination. Since this was a POC indexing speed, we were not looking for whether it would work or not.

Note: we tried to index 20 million documents on our POC cluster and it took us about 23 to 24 hours, which makes us take time and design the production cluster with sizing and settings appropriate.

We are now trying to implement a production cluster (in Google Cloud Platform) with an emphasis on both indexing speed and search speed.

Our use case is as follows:

  1. We will index in bulk 7 million to 20 million documents by index (we have 1 index for each client and there will be only one cluster). This bulk index is a weekly process, that is, we index all the data once and query them for a whole week before updating them.We aim for an indexing rate of 0.5 million documents per second.

We are also looking for a strategy to expand horizontally as we add more customers. I mentioned the strategy in the following sections.

  1. Our data model has a nested document structure and a lot of queries on nested documents that I think require a lot of CPU, memory and IO resources. We are aiming for sub-second times for the 95th percentile of queries.

I've read quite a few things on this forum and on other blogs in which companies have high performance Elasticsearch clusters that are running successfully.

Here are my learnings:

  1. Have dedicated master nodes (always an odd number to avoid brain splitting). These machines can be of average size (16 vCores and 60 GB of RAM).

  2. Give 50% RAM to ES Heap, except the size does not exceed 31 GB to avoid 32-bit pointers. We plan to set it to 28 GB on each node.

  3. Data nodes are the working horses of the cluster and must therefore occupy an important place in CPU, RAM and IO. We plan to have (64 VCores, 240 GB of RAM and 6 * 375 GB SSD).

  4. Also have coordination nodes to process index and bulk search requests.


We now plan to start with the following configuration:

3 Masters - 16Vcores, 60 GB of RAM and 1 SSD of 375 GB
3 Cordinators - 64Vcores, 60GB RAM and 1 X 375GB SSD (Supercomputing)
6 data nodes - 4 VCores, 240 GB of RAM and 6 * 375 GB of SSDs

We plan to add 1 data node for each incoming customer.

Now that the hardware is out of Windows, let's focus on the indexing strategy.

The best practices I have gathered are:

  1. A lower number of fragments per node is good in most scenarios, but provides good data distribution across all nodes for a load balancing situation. Since we plan to have 6 data nodes to begin with, I tend to have 6 nodes for the first client to fully use the cluster.
  2. Have 1 replication to survive the loss of nodes.

Next is the process of bulk indexing. We have a full spark installation and are going to use ElasticSearch-hadoop connector to transmit Spark data to our cluster.

  1. When indexing, we define the refresh interval at 1m to make sure that updates are less frequent.

  2. We use 100 Spark parallel tasks that each task sends 2MB data for the bulk application. So both there is 2 * 100 = 200 MB mass requests that I believe are good in what ES can handle. We can certainly change these settings based on comments or tests and errors.

  3. I've read more information about setting cache percentage, thread pool size, and queue size, but we plan to keep them as defaults smart at first.

  4. We are open to using both Simultaneous CMS or G1GC algorithms for GC but would need advice on this. I've read the pros and cons of using both and the dilemma.


Let's move on to my current questions:

  1. Is sending mass indexing requests to the coordinator node a good design choice or should we send it directly to the data nodes?

  2. We will send queries via coordination nodes. Now my question is, say, since my data node has 64 cores, each node has a thread pool size of 64 and 200 queue sizes. Suppose that during the thread pool of the search data node and the queue size is completely exhausted, will the coordinator nodes still accept and buffer search queries? until their queue is filled as well? Or will 1 lead on the coordinator also be blocked for each request?

Suppose a search request reaches the coordinator node, where it blocks 1 thread and sends a request to the data nodes, which in turn blocks the threads on the data nodes, according to the data in the request. Is this hypothesis correct?

  1. While mass indexing is in progress (assuming we do not run parallel indexing for all clients and we do not schedule them sequentially), how can we best design to ensure that query times are not affected during this mass index

References

  1. https://iblyts.t37.net/designing-the-perfect-elasticsearch-cluster-the-almost-definitive-guide-e614eabc1a87

  2. https://iblyts.t37.net/how-we-reindexed-36-billions-documents-in-5-days-within-the-same-elasticsearch-cluster-cd9c054d1db8

  3. https://www.elastic.co/guide/en/elasticsearch/reference/current/index.html

Wanted: Dallas game hosting a single-chip high-speed KVM or KVM slice

I am looking for a high speed VPS kvm single heart in Dallas for a csgo server that I run.

  • 1/2 vcpus, 3.5 GHz + and a single basic speed 2200+ (www point cpubenchmark net point / singleThread.html)
  • 1+ GB of RAM
  • 30 GB minimum storage (ssd)
  • 2tb + / unlimited bandwidth

Right now, my best offer is a yarn on 7700k for 12 months. Ideas about suppliers?

Are there high-speed video cameras that use lower shutter speeds than microseconds?

I was interested in high speed photography. My gear is limited – I use a DSLR and a custom trigger with a very short xenon flash to take pictures of things like glowing balloons. (I open the shutter in total darkness before popping the balloon and using the flash to freeze the motion.)

From what I've read, the edges of a jumping balloon move faster than the speed of sound. Despite my best efforts, the edges of my bright balloons are still blurry. According to my research, it seems that the fastest discharge I can get from a xenon flash is about 1/40 000 seconds. It seems like you need exposures inferior to a microsecond to get crisp images of the supersonic movement.

I sometimes put cornstarch in the balloons and get fascinating patterns in cornstarch: enter the description of the image here

I really need a flash gap to get sharp pictures. The gap flashes create light discharges as fast as 1/2 microsecond. (1 / 2,000,000 of a second.)

However, what I really want is to understand how these patterns form in cornstarch when the balloon appears. To do this, I need a high-speed video camera that takes images with shutter speeds lower than the microsecond, and very quickly. Are there high-speed commercial cameras that can do this and can be rented by mere mortals? And how could I pump enough light onto my subject to expose these extremely short shutter-speed images?

I know that Mr. Edgerton used moving film and rotating mirrors to create images of a second micropile of explosives, but these cameras weighed hundreds of pounds and cost hundreds of thousands of dollars or even more.

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