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Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D90/D80/D70 (Public) topic #219059
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Subject: "Synch Speed" Previous topic | Next topic
fivetoad Registered since 23rd Feb 2002Mon 02-Feb-04 04:53 AM
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"Synch Speed"


Garland, US
          

A number of people are excited about the 1/500th flash synch speed of the new D70, but I don't completely understand the significance of it; can somebody help me understand the importance of the higher speed?

As I recall, back in the early 70s my Nikkormats had an unusually high synch speed at 1/125th, while most other cameras only synched up to 1/60th. But no one seemed to think that was important because the electronic flash duration was less considerably than either synch speed.

But today folks are talking about the D100 being limited some how by a max 1/180th synch speed, and how the higher synch speed of the D70 is really a great improvement. It may well be that it is, but I don't understand why. Who can help me understand?

Dan



Dan Johnsen
Garland, TX
Time is what keeps everything from happening at once.

  

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HarisAshraf Registered since 21st Feb 2003Mon 02-Feb-04 05:02 AM
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#1. "RE: Synch Speed"
In response to Reply # 0



          

High Flash speed is useful when doing fill flash. With 1/500 synch speed you only need 1/2 power then you woul have needed at 1/250 sec

  

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visionthing Registered since 23rd Nov 2002Mon 02-Feb-04 05:08 AM
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#2. "RE: Synch Speed"
In response to Reply # 1


Cape Town, ZA
          

If you shoot a lot of fast moving action/sport using flash the 1/500 sync speed is VERY valuable. It basically means that you have better action stopping power as well as the option to use wider apertures. I often want to underexspose the background slightly and in order to do this with 1/250 sync speed I need to shoot at +- f11 (100 ASA film in bright daylight) So on your digi-cam with 200ASA the 1/500 sync is essential for daylight flash work.

  

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rustovision Registered since 02nd Feb 2004Mon 02-Feb-04 09:51 PM
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#3. "RE: Synch Speed"
In response to Reply # 0


England, UK
          

Hi,

Fast sych speed is great for outdoor portraits using flash.
You can use a technique where the subject is illuminated much brighter than the background, so the background is say 2 to 3 stops less than the foreground.

You can't get this effect with slow shutter speeds.

Basically how it works is like this: For film speed say 100-400, you'll get
a reading to set your apeture to something like 5.6 - 11 (depending on flash power).

The thing to remember is 1): The Apeture controls how flash is exposed.
2) The shutter controls ambient exposure (light not lit by flash) - background.

In fairly bright conditions once you have set your apeture, the only other control
you have is control over ambient light, ie. the shutter speed. If this is 1/125 it will be too slow to make the background darker.

A fast shutter speed of 1/500 will do the job very nicely, giving you a nice dramatic flash lit portrait with a moody sky/buildings in background.

Fill flash is the 'opposite' technique where the flash is now under exposed by a couple of stops compared to the ambient light, to give a natural 'fill-in' for shadows that doesn't look unatural.

Check out this guy Neil Turner, he's a press photographer who uses a flash over daylight technique and explains how to do it on his excellent site.

Here's the flash bit: http://www.dg28.com/example.3.html

Pete









  

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Zep Basic MemberWed 04-Feb-04 08:00 PM
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#4. "RE: Synch Speed"
In response to Reply # 3


Milwaukee/Waukesha area, US
          

Thanks to everyone for their input - I too found this information handy since I've forgotten what sync speed was all about.

Also, thanks to Pete for supplying the link to www.dg28.com/example.3.html. There's some excellent flash images on there!

"Every exit is an entry somewhere." -Tom Stoppard
Zep

  

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Forums Lobby GET TO KNOW YOUR CAMERA & MASTER IT Nikon D90/D80/D70 (Public) topic #219059 Previous topic | Next topic