| Author |
Message |
Eric
Guest
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 Posted:
Mon Oct 31, 2005 5:40 am Post subject:
need help with 20d and 580ex |
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When I use wide angle lenses I get vignetting with my 20d and 580ex
flash. Although it should work down to about 15mm without using the
wide panel on the flash(24/1.6), I have to use the wide panel all the
time with the ef-s 10-22 lens.
Also, when using the 580ex in manual mode I get severe overexposure
(all focal lengths). The reach of the flash is almost twice the
distance reported on the distance scale. Is this known problems, or am
I doing something wrong? Is this a warranty issue?
-eric
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Eric
Guest
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| Posted:
Mon Oct 31, 2005 5:40 am Post subject:
Re: need help with 20d and 580ex |
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On Sun, 30 Oct 2005 18:50:19 -0800, "MarkČ" <mjmorgan(lowest even
number here)@cox..net> wrote:
| Quote: |
Manually zoom your flash head to its widest setting, and try again.
If you don't get vinetting, this will at least identify that it is a flash
head zooming issue (not moving to wide zoom as it should).
Setting the flash head to "24mm" manually did indeed remove the |
vignetting! Tested with 18mm lens. One bug confirmed (as Stephen
already has pointed out)! Has anyone gotten a new 580 on warranty?
| Quote: | About the distance indication:
What ISO is your camera set at?
I was thinking the 580 was "aware" of ISO...could be wrong.
|
It's aware of both ISO and aperture setting. Did some new
tests(shutter set to 250 to avoid natural light interference) and at
6m distance I had to adjust until the flash distance coverage scale
showed a reach of 3m to get same result as with ETTL mode used. Can
someone please do the same test and post the result here?
-eric |
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MarkČ
Guest
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| Posted:
Mon Oct 31, 2005 5:40 am Post subject:
Re: need help with 20d and 580ex |
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Eric wrote:
| Quote: | On Sun, 30 Oct 2005 16:30:00 -0800, "MarkČ" <mjmorgan(lowest even
number here)@cox..net> wrote:
...
Just in case you're not familiar... The "Manual" flash head zoom
control is entirely different from "Manual flash POWER" setting.
I get overexposure with the manual power setting. Just tested at 55mm
focal length, the flash head zoomed to "50mm" automatically, but the
distance scale for reach seems to be wrong. At a distance of 4m,
choosing 2m on the flash (by adjusting lens aperture on camera) seems
to be about right. When choosing ETTL on the flash, exposure is good.
|
Manually zoom your flash head to its widest setting, and try again.
If you don't get vinetting, this will at least identify that it is a flash
head zooming issue (not moving to wide zoom as it should).
About the distance indication:
What ISO is your camera set at?
I was thinking the 580 was "aware" of ISO...could be wrong. |
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Stephen M. Dunn
Guest
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| Posted:
Mon Oct 31, 2005 5:40 am Post subject:
Re: need help with 20d and 580ex |
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In article <vqlam1l1o0bp0p0fu7jbpac59477botejn@4ax.com> Eric <nospam@invalid.com> writes:
$ When I use wide angle lenses I get vignetting with my 20d and 580ex
$flash. Although it should work down to about 15mm without using the
$wide panel on the flash(24/1.6), I have to use the wide panel all the
$time with the ef-s 10-22 lens.
This is a known issue with the crop factor compensation feature
of at least some 580EX units. Apparently, on a 1.6-crop body,
it won't zoom any wider than (I'm working from memory here) the
35mm setting. So if your lens' focal length is wider than
about 22mm, you'll get vignetting.
Try it out and see. Watch the zoom position indicator on the
flash as you zoom from >22mm to <22mm and see what it does.
Rumour has it that current production units have this bug
fixed. Not being a user of this flash, I can't say from personal
experience.
--
Stephen M. Dunn <stephen@stevedunn.ca>
| Quote: | ----------------> http://www.stevedunn.ca/ <----------------
------------------------------------------------------------------ |
Say hi to my cat -- http://www.stevedunn.ca/photos/toby/ |
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Eric
Guest
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| Posted:
Mon Oct 31, 2005 5:40 am Post subject:
Re: need help with 20d and 580ex |
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On Sun, 30 Oct 2005 16:30:00 -0800, "MarkČ" <mjmorgan(lowest even
number here)@cox..net> wrote:
....
| Quote: | Just in case you're not familiar... The "Manual" flash head zoom control is
entirely different from "Manual flash POWER" setting.
I get overexposure with the manual power setting. Just tested at 55mm |
focal length, the flash head zoomed to "50mm" automatically, but the
distance scale for reach seems to be wrong. At a distance of 4m,
choosing 2m on the flash (by adjusting lens aperture on camera) seems
to be about right. When choosing ETTL on the flash, exposure is good.
--eric |
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MarkČ
Guest
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| Posted:
Mon Oct 31, 2005 5:41 am Post subject:
Re: need help with 20d and 580ex |
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Eric wrote:
| Quote: | When I use wide angle lenses I get vignetting with my 20d and 580ex
flash. Although it should work down to about 15mm without using the
wide panel on the flash(24/1.6), I have to use the wide panel all the
time with the ef-s 10-22 lens.
Also, when using the 580ex in manual mode I get severe overexposure
(all focal lengths). The reach of the flash is almost twice the
distance reported on the distance scale. Is this known problems, or am
I doing something wrong? Is this a warranty issue?
-eric
|
It's possible that the flash head zoom motor is locked in manual zoom mode
(not lens zoom, but the flash head zoom feature). Set the flash zoom to
auto and check to be sure that the head is zooming, perhaps on another zoom
lens that has a range which would cause the change. Many aren't aware that
the flash head adjusts the light emitter depending on the focal length (I
assume you know this...but even if you do, it's easy to forget that its in
manual zoom mode--if its anything like my 550EX). If you've got it manually
set to a tele focal length, it will center the light, assuming you're
shooting a small tele field of view.
Another possibility is that the flash zoom motor is defective and is stuck
in the narrow light pattern position...
-Mark |
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MarkČ
Guest
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| Posted:
Mon Oct 31, 2005 5:41 am Post subject:
Re: need help with 20d and 580ex |
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MarkČ wrote:
| Quote: | Eric wrote:
When I use wide angle lenses I get vignetting with my 20d and 580ex
flash. Although it should work down to about 15mm without using the
wide panel on the flash(24/1.6), I have to use the wide panel all the
time with the ef-s 10-22 lens.
Also, when using the 580ex in manual mode I get severe overexposure
(all focal lengths). The reach of the flash is almost twice the
distance reported on the distance scale. Is this known problems, or
am I doing something wrong? Is this a warranty issue?
-eric
It's possible that the flash head zoom motor is locked in manual zoom
mode (not lens zoom, but the flash head zoom feature). Set the flash
zoom to auto and check to be sure that the head is zooming, perhaps
on another zoom lens that has a range which would cause the change. Many
aren't aware that the flash head adjusts the light emitter
depending on the focal length (I assume you know this...but even if
you do, it's easy to forget that its in manual zoom mode--if its
anything like my 550EX). If you've got it manually set to a tele
focal length, it will center the light, assuming you're shooting a
small tele field of view.
Another possibility is that the flash zoom motor is defective and is
stuck in the narrow light pattern position...
-Mark
|
PS...
Just in case you're not familiar... The "Manual" flash head zoom control is
entirely different from "Manual flash POWER" setting. |
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Dirty Harry
Guest
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| Posted:
Fri Nov 04, 2005 3:19 am Post subject:
Re: need help with 20d and 580ex |
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"Eric" <nospam@invalid.com> wrote in message
news:j7qkm1d0us6um2qjg3qktakc8j00eg8ref@4ax.com...
| Quote: | On Thu, 3 Nov 2005 19:43:03 +0100, Wolfgang Weisselberg
ozcvgtt02@sneakemail.com> wrote:
Eric <nospam@invalid.com> wrote:
What about the distance coverage scale reading wrong in manual power
mode? Is that a "feature" to?
Please check that you have ZERO flash compensation set
- in the flash itself
- in the camera
If either of those is set (about +2 stops, I'd guess), the symptom
would be understandable ...
-Wolfgang
In manual power mode any compensation is ignored (just tested it to
be sure). You just adjust aperture/iso on the camera or output power
on the flash while watching the distance coverage scale on the flash.
-eric
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What??? In manual mode(20d on M) FEC still works the way it's suposed too.
You are sure you don't have something other then FEC-0 programed into the
20d(not the flash)? |
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Eric
Guest
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| Posted:
Fri Nov 04, 2005 4:00 am Post subject:
Re: need help with 20d and 580ex |
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On Thu, 03 Nov 2005 21:19:45 GMT, "Dirty Harry" <nothin@nowhere.com>
wrote:
| Quote: | What??? In manual mode(20d on M) FEC still works the way it's suposed too.
Yes it does! The problem is 580ex in manual power mode. It reads iso |
and aperture from camera, but if I follow the reach indicated by the
flash I get 1-2 stop overexposure and highlight burnout.
-eric |
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