Forums
New posts
Search forums
What's new
New posts
New media
New media comments
New profile posts
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
New profile posts
Search profile posts
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Learning
Flashes
Can 2 AF assist lamps be used at the same time? (on camera & off camera ext' flash)
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="WayneF" data-source="post: 376994" data-attributes="member: 12496"><p><strong>Re: Can 2 AF assist lamps be used at the same time? (on camera & off camera ext' flas</strong></p><p></p><p>Sure, try it, and see what you think. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> </p><p></p><p>Bounce needs all the power we can get, and the SB-400 is not a high power flash. But it can do some things.</p><p>Guide Number ISO 100 is 21 (meters) / 69 (feet).</p><p></p><p>The YN468 II says GN 33 (meters) / 108 (feet), but it zooms 24-85mm, and it does not say at which GN 33 applies? No Guide Number chart? I've never seen that. So it is unknown, at least to me.</p><p></p><p>(YN565EX is GN 28/92 at 24mm, or GN 39/128 at 35mm, and up to GN 58/190 at 105mm zoom). </p><p></p><p>Comparing this 35mm GN 39 to the SB-400 GN 21 is 1.8 stops more power, for ISO or aperture or distance.</p><p></p><p>A SB-800 is same power as the 565, and I typically use ISO 400 f/5.6 on ten foot ceilings, but commercial 12 foot ceilings will need f/4 ISO 400. If standing... Lower ceiling are easier, but if down on the floor with the kids, it raises the ceilings. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> f/4 really goes better with a f/2.8 lens. </p><p></p><p>So the GN is suggesting SB-400 may need a couple more stops of ISO. Underexposure can mean either you just routinely need a bit of +EV flash compensation, but if the problem is limited power capacity, then compensation cannot do anything, it can make no change when maxed out.</p><p></p><p>The SB-400 will need to use higher ISO for bounce, maybe ISO 800. The problem with high ISO with flash is that it increases sensitivity to the orange incandescent ambient lights. If bright, using camera Manual mode for 1/200 second will still help keep it out better than will camera A 1/60 second. The TTL flash is still automatic flash in any camera mode.</p><p></p><p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000">Yes, head aims up, but then the card faces forward and level. Card is just laid flat on top of the flash head, extending a bit past it, then the head is aimed up. Rubber band will hold it there.</span></p> <p style="text-align: left"><span style="color: #000000"></span></p> <p style="text-align: left"><span style="color: #000000"><img src="http://www.scantips.com/lights/images/dsc_5985.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </span></p> <p style="text-align: left"></p></blockquote><p></p>
[QUOTE="WayneF, post: 376994, member: 12496"] [b]Re: Can 2 AF assist lamps be used at the same time? (on camera & off camera ext' flas[/b] Sure, try it, and see what you think. :) Bounce needs all the power we can get, and the SB-400 is not a high power flash. But it can do some things. Guide Number ISO 100 is 21 (meters) / 69 (feet). The YN468 II says GN 33 (meters) / 108 (feet), but it zooms 24-85mm, and it does not say at which GN 33 applies? No Guide Number chart? I've never seen that. So it is unknown, at least to me. (YN565EX is GN 28/92 at 24mm, or GN 39/128 at 35mm, and up to GN 58/190 at 105mm zoom). Comparing this 35mm GN 39 to the SB-400 GN 21 is 1.8 stops more power, for ISO or aperture or distance. A SB-800 is same power as the 565, and I typically use ISO 400 f/5.6 on ten foot ceilings, but commercial 12 foot ceilings will need f/4 ISO 400. If standing... Lower ceiling are easier, but if down on the floor with the kids, it raises the ceilings. :) f/4 really goes better with a f/2.8 lens. So the GN is suggesting SB-400 may need a couple more stops of ISO. Underexposure can mean either you just routinely need a bit of +EV flash compensation, but if the problem is limited power capacity, then compensation cannot do anything, it can make no change when maxed out. The SB-400 will need to use higher ISO for bounce, maybe ISO 800. The problem with high ISO with flash is that it increases sensitivity to the orange incandescent ambient lights. If bright, using camera Manual mode for 1/200 second will still help keep it out better than will camera A 1/60 second. The TTL flash is still automatic flash in any camera mode. [LEFT][COLOR=#000000] Yes, head aims up, but then the card faces forward and level. Card is just laid flat on top of the flash head, extending a bit past it, then the head is aimed up. Rubber band will hold it there. [IMG]http://www.scantips.com/lights/images/dsc_5985.jpg[/IMG] [/COLOR] [/LEFT] [/QUOTE]
Verification
Post reply
Forums
Learning
Flashes
Can 2 AF assist lamps be used at the same time? (on camera & off camera ext' flash)
Top
