Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Pentax / Samsung dSLR, K Mount Mirrorless

Reply
 
Thread Tools Search this Thread
Old Jul 11, 2008, 10:45 PM   #1
Senior Member
 
danielchtong's Avatar
 
Join Date: Dec 2005
Posts: 2,890
Default

Re the image below. I think it is a pretty good and versatile setup. Thanks to Ed (Dawg) for his input. And I was about to pull the trigger.
But one question: how can the pttl flash meter if it is facing the umbrella (if the umbrella is on)?
If it cannot meter, would that mean I can only use the flash manually?
The set up is cool/neat in that the flash will be fairly high above the camera.
Any opinion would be appreciated on this close to studio setup

Daniel
Attached Images
 
danielchtong is offline   Reply With Quote
Sponsored Links
Old Jul 12, 2008, 4:32 AM   #2
Senior Member
 
Join Date: Aug 2006
Location: Essex, UK
Posts: 1,868
Default

As far as I know, the flash has nothing to do with the PTTL.

It should fire a pre-flash into the umbrella and the camera will set the right setting. I don't think that the flash has a sensor on it to measure the light.


When I use my macro setup, the flash is stretched out flat, and the pictures are correctly exposed.



Dal

Dal1970 is offline   Reply With Quote
Old Jul 12, 2008, 5:36 AM   #3
Senior Member
 
snostorm's Avatar
 
Join Date: Jan 2004
Location: Chicago Suburb, IL, USA
Posts: 2,770
Default

Hi Daniel,

Dal is correct that the flash doesn't meter anything, as the metering is done by the camera's metering system.

This setup possibly wouldn't work reliably if you were using the popup flash to trigger the flash in wireless TTL, because the flash needs to communicate with the body in a series of preflashes and the umbrella might not reflect enough for this to happen, but with a P-TTL remote cord, it should work fine, as all the communication between the flash and the camera body is done through the cord.

This setup looks cumbersome, but it should give you some great lighting.

Scott
snostorm is offline   Reply With Quote
Old Jul 12, 2008, 6:23 AM   #4
Senior Member
 
danielchtong's Avatar
 
Join Date: Dec 2005
Posts: 2,890
Default

Same idea as this one





snostorm wrote:
Quote:
Hi Daniel,

Dal is correct that the flash doesn't meter anything, as the metering is done by the camera's metering system.

This setup possibly wouldn't work reliably if you were using the popup flash to trigger the flash in wireless TTL, because the flash needs to communicate with the body in a series of preflashes and the umbrella might not reflect enough for this to happen, but with a P-TTL remote cord, it should work fine, as all the communication between the flash and the camera body is done through the cord.

This setup looks cumbersome, but it should give you some great lighting.

Scott
Oops. There is a syn cord between the flash and camera except it is not shown . Nothing wireless at all.

Daniel
Attached Images
 
danielchtong is offline   Reply With Quote
Old Jul 12, 2008, 6:26 AM   #5
Senior Member
 
danielchtong's Avatar
 
Join Date: Dec 2005
Posts: 2,890
Default

The above is normal set up. At the top of the bracket there is an umbrella mount for the flash to point backward.
There is no way that the preflash can be picked up by the camera metering system. So for this set up, all metering will be manual if I am correct.
Attached Images
 
danielchtong is offline   Reply With Quote
Old Jul 12, 2008, 12:27 PM   #6
Senior Member
 
snostorm's Avatar
 
Join Date: Jan 2004
Location: Chicago Suburb, IL, USA
Posts: 2,770
Default

Hi Daniel,

I think you'll find you're wrong about that. I've bounced off a wall in back of me and ceilings as high as 12 ft using P-TTL, and it works fine, so there's no reason this setup wouldn't work well for you.

Scott
snostorm is offline   Reply With Quote
Old Jul 12, 2008, 12:54 PM   #7
Senior Member
 
danielchtong's Avatar
 
Join Date: Dec 2005
Posts: 2,890
Default

snostorm wrote:
Quote:
Hi Daniel,

I think you'll find you're wrong about that. I've bounced off a wall in back of me and ceilings as high as 12 ft using P-TTL, and it works fine, so there's no reason this setup wouldn't work well for you.

Scott
Ok. Do you mean that the little preflash hitting the umbrella (at the back) and the subject (at the front) will be picked up by the camera for metering?
Hope it works out. I should be able to test it out in some local camera shop to see if that is the case. Thanks for all inputs




Daniel
danielchtong is offline   Reply With Quote
Old Jul 12, 2008, 1:49 PM   #8
Senior Member
 
jachol's Avatar
 
Join Date: Aug 2006
Location: NW. England
Posts: 1,201
Default

Hi Daniel,

I thinkDal and Scottsaying the camera will measure any light reflected by the subject from the preflash, and then compute an suitable exposure. That's the way I understand it anyway, hope I'm right. ... Jack
jachol is offline   Reply With Quote
Old Jul 12, 2008, 2:08 PM   #9
Senior Member
 
bigdawg's Avatar
 
Join Date: Feb 2005
Location: Thach Alabama
Posts: 14,981
Default

It is a neat setup for doing on the spot Portraits. I think you'll like it Daniel! I decided to go ahead and do the CRD type flash and camera mount we looked at. I ain't a goin' to pay 800 bucks and tax for one though...Already started machining one to work with anything up to my bigma and K10D. Also work with my DX6490 Kodak and my cokin filter system. Now
I just need enough down time at work to do it! This is the one I mean!!LOL


http://reallyrightstuff.com/CRD/02.html

Dawg

bigdawg is offline   Reply With Quote
Old Jul 12, 2008, 6:43 PM   #10
Senior Member
 
snostorm's Avatar
 
Join Date: Jan 2004
Location: Chicago Suburb, IL, USA
Posts: 2,770
Default

jachol wrote:
Quote:
Hi Daniel,

I thinkĀ*Dal and ScottĀ*saying the camera will measure any light reflected by the subject from the preflash, and then compute an suitable exposure. That's the way I understand it anyway, hope I'm right.
Yes! -- the umbrella should be considerably more reflective (and will be closer to the flash head) than flat white painted walls and ceilings, and the preflash should be more than enough to allow the camera to meter. You may find that you have to up the ISO setting on the camera to get better exposures at greater distances, but you would have to do that anyway for any bounce situations.

Scott
snostorm is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 6:56 AM.