Pixalo Photography Community

Go Back   Pixalo Photography Community > Photography Forums > General photography questions and answers

General photography questions and answers: Discuss Max Flash Sync?...Right, I'm a bit baffled... I understand why a camera has a maximum flash sync speed (the longest amount of ...
Welcome to the Pixalo Photography Community. As a Guest you are free to browse the site, but see what extras you get as a Member here.


Reply
 
LinkBack Thread Tools Display Modes
Old 10-01-2006, 15:11   #1 (permalink)
Chez
Guest
 
Posts: n/a
User's Gallery
Max Flash Sync?

Right, I'm a bit baffled...

I understand why a camera has a maximum flash sync speed (the longest amount of time that the entire frame is exposed for).

What is the purpose of the Max Flash Sync setting though?

Why would you want to limit it at anything less than the maximum..

Surely, with it set at the max, the flash will sync at any shutter speed up to (and including) the maximum??

Let's say I'm in manual mode.

Shutter = 1/60s
Aperture = f/1.8
ISO = 200

What is the difference between having Flash Sync Speed (custom setting) on 1/60s as opposed to 1/250s?

Thanks in advance
Chez

Last edited by Chez; 10-01-2006 at 17:58.
 
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 18:02   #2 (permalink)
CT
Feet under the table
 
CT's Avatar
 
Join Date: Mar 2005
Location: West Mids UK
Posts: 3,368
CT is an unknown quantity at this point

Image editing O.K.
User's Gallery
You're thinking of this in the wrong terms Chez. If the flash is set on max sync speed it will sync with any shutter speed all the way down to long time exposures in the sense that the flash will occur while the shutter is fully open. It wouldn't be much use to you though. The idea is to be able to use the flash balanced with ambient light to provide fill flash - just enough flash to brighten the subject and lighten the shadows, allowing the ambient light to be the main source of illumination. We do that by first taking an exposure meter reading in the usual way. Say your indoor reading is 1/60th at f8. If you use Shutter Priority Mode (which I find easiest for this technique) then simply set your shutter speed to 1/60th and the flash will adjust it's output for those settings resulting in a shot nicely balanced between flash and ambient light. The other way of course is to use Manual Mode, set 1/60th at f8 and again the flash will adjust it's output to those settings.

This is often referred to as 'Slow Flash Sync' You don't know how lucky you are - prior to TTL metering, you could only achieve fill flash with a focal plane shutter(which all SLRs have) by dividing the aperture you wanted to use into the flash guide no. which gave you the distance you had to take your shot from, OR divide the distance at which you wanted to shoot into the guide number, which gave you the aperture you had to use. Modern cameras and flashguns have made what used to be a PITA into a simple process.

Another use for it is imagine it's evening and a beautiful sunset. You want to photograph your signicant other with the sunset as a backdrop. Your normal choices would be an available light shot which would be great for the sky but leave your other half as a silhoutte, OR use flash which would be great for 'er indoors, but the exposure would be far too short for the sunset and you'd end up with an under-exposed black background.

Take a normal meter reading for the sunset - say it's 1/20th at f8. Now set your camera to those settings as described. You'll have to tell her (or him ) to keep reasonably still with a shutter speed that slow, but your camera makes the correct exposure for the sunset, and during the exposure the flash fires just strongly enough to light up your foreground figure.... Voila!

What you need to do is some quick practice shots indoors under room lighting to see what a huge difference this makes to your shots,

Hope that helps Chez. Sing out if not.


__________________
Canon 1DMk2N/ EF 50mm 1.4/ EF 17-40L/ EF180L Macro/ EF100-400L
Canon 20D /17-85 EF-S
580EX Flashgun/ Gitzo Explorer

CT is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 18:32   #3 (permalink)
Chez
Guest
 
Posts: n/a
User's Gallery
Thanks CT. That has answered a couple of questions I had about flash..

However, it doesn't fully answer this one. Perhaps I should have explained in more detail..

I am using a Nikon D200 with a Nikon SB-600 flash.

The max flash sync speed of the D200 is 1/250, with a 'pulsing' mode (called FP) above that.

I have a custom setting (e1), called 'Flash Sync Speed', which has the following options -

1/250s
1/250s (Auto FP)
1/200s
1/160s
(and so on, all the way to 1/60s)

Now, I can see why you would want to have the option of Auto FP on or off, but why would you ever set this at anything other than 1/250s or 1/250s (Auto FP)??

This has no effect on shutter or aperture speed.

So whichever mode I'm in (A,S or M), say the metering is done and the required settings are (as above) -

Shutter = 1/60s
Aperture = f/1.8
ISO = 200

What would be the difference between setting this custom setting to 1/60 or 1/250?

I hope that is a little clearer..??
 
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 18:32   #4 (permalink)
Forum Regular
 
Join Date: Jan 2005
Location: Gloucester UK
Posts: 741
MyPix is an unknown quantity at this point

Image editing O.K.
User's Gallery
nice description ther CT,
very usefull

on Nikons its known as ' rear curtain sync ' but exactly the same thing,
dunno about the canon, but the Nikon also does a 'slow rear curtain sync ,front curtain sync , slow sync , for lots of creative effects,
plus the usual red eye settings etc

MyPix
MyPix is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 18:38   #5 (permalink)
CT
Feet under the table
 
CT's Avatar
 
Join Date: Mar 2005
Location: West Mids UK
Posts: 3,368
CT is an unknown quantity at this point

Image editing O.K.
User's Gallery
My Pix..... 'Rear Curtain Sync' is something else entirely! That's used to obtain blurring behind moving obects rather than in front of them for a more natural appearance.
CT is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 18:52   #6 (permalink)
CT
Feet under the table
 
CT's Avatar
 
Join Date: Mar 2005
Location: West Mids UK
Posts: 3,368
CT is an unknown quantity at this point

Image editing O.K.
User's Gallery
Chez, without looking at your manual and seeing what these modes are all about it's difficult to say.The honest truth though is all these fancy modes are there to help people who don't have a basic understanding sufficient to make these settings themselves, and it really isn't that difficult.

My Canon 20D has umpteen modes I'll never use including a 'Slow Flash Sync' mode. It also has a 'Landscape' mode, but it isn't rocket science to understand that all it does is bias your exposure in favour of smaller apertures for DOF. The 'Action' programme will simply bias in favour of faster shutter speeds.

These programmes are just gimmicks. The only modes you need are Manual, Aperture Priority and Shutter Priority.... honestly. They can be useful sometimes and convenient, but they're a real bar to you progressing and actually understanding what you're doing.

Forget the funny modes and you'll be OK.
CT is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 19:46   #7 (permalink)
Forum Regular
 
Join Date: Jan 2005
Location: Gloucester UK
Posts: 741
MyPix is an unknown quantity at this point

Image editing O.K.
User's Gallery



MyPix, lol
MyPix is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 19:53   #8 (permalink)
Chez
Guest
 
Posts: n/a
User's Gallery
Thanks CT, but it's not an extra mode, it's a setting in the menus..

You're probably right though, it seems to work fine left on 1/250
 
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 19:58   #9 (permalink)
dod
Feet under the table
 
dod's Avatar
 
Join Date: Feb 2005
Location: Nairn
Posts: 1,907
dod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura aboutdod has a spectacular aura about

Image editing O.K.
User's Gallery
That pulsing mode sounds a bit like high speed synch or maybe a strobe effect? What's the manual say?
dod is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 20:37   #10 (permalink)
Forum Regular
 
Arkady's Avatar
 
Join Date: Feb 2005
Location: Aldershot, Hampshire
Posts: 1,198
Arkady is an unknown quantity at this point
User's Gallery
Pulsing mode on Nikon speedlights is - believe it or not, so you can preview where any shadows will occur. Hit the pulse button and it whirrs away, emitting loads of brief pulses which are visible through the viewfinder allowing you to 'preview' the flash.

I just leave my SB-800 on program, with the camera to manual and adjust the output via the exposure compensation dial on the flash to - 1/3, 1/2 2/3 etc as required.

Flash is a black art which when done right should be seamless with the ambient light in the image. Unfortunately it's so easy to do it wrong.
__________________
"When I hold a camera, I Know no fear..." Alfred Eisenstadt

Nikon D2x Bodies x2
14mm f/2.8 Sigma; 17-24mm f/2.8 Nikkor; 28-80mm f/2.8 Nikkor; 24-85mm f/2.8-4 Nikkor; 80-200mm f/2.8 Nikkor; 300mm f/2.8 Nikkor; 600mm f/4 Nikkor
SB-800 Flash x2
Arkady is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 10-01-2006, 20:49   #11 (permalink)
Chez
Guest
 
Posts: n/a
User's Gallery
the pulsing is the high speed sync.. (FP mode)

Arkady - I know what you mean, my D200 does that when you press the DOF preview..
 
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Adobe Flash critical vulnerability - affects pre-9.0 Flash plugins. Steve News 1 12-07-2006 18:06
Using Flash! scoff General photography questions and answers 20 04-04-2006 13:12
Flash or not to Flash? Oh do behave! jkovasc Cameras, Lenses and Accessories 8 12-03-2006 17:17
Flash And Red-eye. CT Tutorials and Guides 1 30-01-2006 15:26
High speed, 2nd curtain sync and stroboscopic flash Bachs General photography questions and answers 8 07-11-2005 13:08


All times are GMT +1. The time now is 23:33.


vBulletin Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
ReviewPost & PhotoPost vB3 Enhanced, Copyright 2003-2014 All Enthusiast, Inc.
SEO by vBSEO 3.3.0
Copyright 2006 - 2017 Pixalo.com

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196