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Why I use High-Speed Flash Sync

Dave Fiala • September 10, 2020

When I am out shooting, I am always trying to think of how I can get the most out of my equipment. I am thinking about how I can expand my ability to create using my camera, lenses, and filters. And, what about my flash, what I can I do with that? Flashes today are a lot different than when I started in photography. Back then you had a manual mode and an auto mode and that was about it.


Most modern flashes today have a multitude of functions. Balanced fill flash, front curtain, and rear curtain sync. High-Speed Sync also is known as FP (focal plane) mode. Some flashes can be set to fire multiple bursts creating several flash images on a single frame. Many flashes available today are set up to be used off-camera. Back in the good old days if you wanted to get your flash off of the camera you could use an off-camera cord. That was OK for close work but the wireless flashes setup of today permit unlimited flash positioning.


One of the modes I use quite a bit is the High-Speed Sync or FP mode.
First a little bit about how it works. 


High-Speed Sync is also known more accurately as Focal Plane flash. Here it is in a nutshell. flashes and cameras have a maximum shutter speed that the flash can be synced to. On most of the older cameras that was 1/125th of a second. Cameras today can sync at 1/250th. With these cameras, if you set a higher shutter speed one speed faster than the sync speed, you will get a black band usually at the bottom of the image. If you increase the shutter speed another stop faster the black band will double in width. So if your camera has a sync speed of a 1/250th and you set your shutter speed to 1/500th you will see that black band. Increase the speed to 1/1000th and the band doubles in width. Go ahead, increase the speed to a 1/2000th and see what happens?


This occurs because the flash and camera cannot, in the normal mode, sync to the higher speed, and the black band is caused because the shutter is not open all of the way when the flash fires.


In the normal flash setting, the flash waits to fire until the instant that shutter curtains are open all of the way. The flash only fires for that instant.


In High-Speed Sync. Wait. Let’s call it the focal plane mode or FP mode because that helps explain what is happening. In FP mode when you press the shutter button on the camera the flash starts firing. The flash continues to fire all of the time that the shutter is opening and closing. So the functional difference between the standard and FP mode is that in the standard mode, the flash fires only for the instant that the shutter is all of the way open. In the FP mode, the flash is firing and continues firing during the entire operation of the opening and closing of the shutter, thus there is no black band.

 
When we use the FP mode we have to be aware that the flash is working very hard to put out that continuous flash and so flash distance is decreased. Also, the batteries are being drained at a faster rate and the flash may heat up if fired continuously. When I use this mode to shoot water drops, I have my camera set in high-speed continuous shooting mode and my Nikon SB-900 would get to the point of overheating and shut down to protect the flash. So how hot was hot? So hot, that I would open the battery door and drop the batteries out on to a plate. I did not want to hold those batteries in my hand. Not for long anyway.


Ok, so that is how it works now on to what does it do for me?


High-Speed Sync is useful for almost all types of photography. It can be used for shooting portraits. It can be used when shooting sports as long as you are close enough to the action and have a powerful enough flash. Small flashes can be convenient to carry around but if you are planning on buying a flash to do this kind of shooting my advice is to go big or go home! To get any good distance when in FP mode you need a flash with a lot of punch! That said, I have been using my little Promaster 100SL. Coming in just south of $150.00, it has been doing a pretty darn good job at garden distances.
If you are going to use a flash in FP mode for portraits or sports I would recommend a more powerful flash unit.
Lately, I have been using the 100SL flash in FP to shoot hummingbirds, bees, and plants and flowers on my deck. Did someone say quarantined?


I use the FP mode to get high shutter speeds when I am shooting the little birds to slow down the wings and to slow down the fast-moving birds in general. I get a stop action effect that I do not quite get at the slower shutter speeds. Using the high shutter speeds also causes dramatic flash fall off creating dark, sometimes black backgrounds that make the bird stand out. When I shoot flowers with the fast shutter speeds I get the same result. Very dark backgrounds that make the colors of the flowers pop! Sometimes people who shoot a lot of plants and flowers will carry a piece of black velvet to place behind the subject to get that black background. I have done that, but it is kind of a pain because it is another thing to carry and it also picks up lint and little pieces of debris that are almost always white (Murphy’s Law) and they show up in the photo so I have abandoned the velvet practice and now just use my flash to get the darkened background effect. 



Here are a few pictures. See how the dark background makes that flower pop when compared to the version without the flash.

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I was setting it up in the winter and I started to wonder if it was OK to have this instrument out in the cold weather. So I called the company and asked about it. They tell me that cold weather shouldn't be a problem. They use them in the cold all the time when they are testing them and using them at the factory. OK, I said I am just wondering because it was pretty cold last night. Then the guy at Meade asked how cold it was and I told him it was 2 above. Two above what, he asked? Zero, I told him. 2 Above zero, where are you? Wisconsin I told him. Then I asked where he was located? Costa Mesa, California he replies. Now, Costa Mesa never gets any colder than about 40 degrees. In Costa Mesa when it is 40 degrees these guys are wearing long underwear. In Wisconsin, when it is 40 degrees, the UPS guy is in shorts and sweating bullets. So I suppose this is as good a time as any to get the subject of this post which is. Is it safe to use my camera in the cold? The answer for the most part is yes. That being said, the next question is how cold, and for how long? The problems encountered when using cameras in the cold are condensation and battery life. Condensation can form in and on the camera and the front of the lens. So when you are out in the cold you have to watch the front of the lens and make sure that it stays clear of condensation or frost. When I had my telescope out in the winter I would use a hair drier to keep it clear Later I got a heater that wrapped around the hood and that would keep the front element clear. You can buy similar battery-operated heaters that attach to your lens hood. You can also use some of those hand warmers that you put inside your gloves. Just use some double-sided tape or Velcro tape to hold them in place. Just make sure to attach them to the outside of the hood so they don’t interfere with the light coming in. The next problem is battery power. Everyone knows that batteries do not like cold weather. When your car will not turn over, it is usually on the coldest day. This is not because some guy named Murphy thinks it's hilarious for you to be standing out in the cold. It is because the extreme cold is very hard on batteries. For some cameras, you can get a battery pack the plugs into your camera and has a cord the feeds to a battery that you have inside your coat. The battery stays warm and so the camera keeps working. Another option is to simply carry spare batteries inside your coat. This is my method and it works as long as I wear a warm enough coat! When the battery in my camera starts going dead I switch it out with one of the warm ones. Once the battery has warmed up inside my coat it may come back to life and I may be able to put it back in the camera and get some more shots out of it. Buy a spare battery here. But I make sure I have plenty of spare batteries so I can keep shooting and not miss those great shots. I have 3 spare batteries but the number of batteries you are going to carry is up to you. I carry more batteries than I have ever gone through on a shoot. But after all, that is how I planned it! The other things we need to do are make sure we have spare batteries for any remote controls, flashes, and flashlights that we take on our cold weather expeditions. Hand warmers and gloves. I have a couple of pairs of Promaster gloves that we sell in the store and I always leave one pair in my car just in case. It is too easy to think I have everything only to arrive on location and realize I forgot my gloves. Another thing about the extra gloves is if I am shooting with someone else and they forgot their gloves. Then I get to be the good guy and save the day!
What does a lens limit switch do?
By Dave Fiala August 30, 2023
I see that some lenses have a limit switch. What exactly does that do?  This switch is encountered on Macro and some telephoto lenses. These may have two or three distances that you can limit the focus to thereby providing a solution to the camera and lens searching for the focus. For example, when using a macro lens and we are photographing a bug at a close distance sometimes the lens will miss the focus. Without having the limit switch set to close range the lens will run all the way to infinity. Once it reaches the stop at infinity it will start on its way back to the closer distances to try and find the focus. If it misses again the lens will hit the close-range stop and start searching for focus again. If we have the limit switch set for the close distance it will not run all the way out to infinity because we have set the lens not to allow that long travel. The same is true if we are using a macro lens to shoot a head and shoulders portrait. If we are shooting someone at say, 12 feet away and the camera misses focus it might run the focus all the way back to the closest macro distance. Only when it hits the close distance stop of the lens will it start running back out to search for the focus. My Fujinon 80mm macro has a 3 position switch. The distance can be limited to, 0.24 to 0.5 meters or 0.5 meters to infinity, the 3rd setting is Full. Only if set to full will the lens run the full range of travel searching for focus. By setting the limit switch I can save time, battery power, and the aggravation of having the camera and lens searching for focus.
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