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vortex warmimg cards
Old 11-19-2005, 06:32 PM   #1 (permalink)
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I posted this in the wrong forum before maybe some tech folks can help me. I'm having trouble using the vortex warming cards. can these be used with on camera flash? if not how do you compensate and balance for fill flash. I usually set my white balance with a three stipe target with white on the reverse side I forget who makes them. Any help would be appreciated.
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this may help...
Old 11-19-2005, 09:19 PM   #2 (permalink)
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http://www.garageglamour.com/store/w...warmcards1.php
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Re: vortex warmimg cards
Old 11-19-2005, 11:31 PM   #3 (permalink)
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If you are using the flash as fill, which may be the case, then the white balance is a mix of the flash and ambient light. If you use the "warm cards" to set your white balance, then that takes into account both the flash and the ambient since you fill the frame with the card and shoot it as your WB reference shot. If you use just a white card then you are getting a WB that will make a gray card look 18% gray. You can often just set the Kelvin setting of the camera (if your camera lets you do that) to 5800K and that warms up the image quite a bit. If you shoot RAW, then you can adjust the color balance in post processing to anything you want.

I use a Black/Gray/White target that was made by Ed Pierce and is now licensed to Wescott. You can use the back side for white balance, you you can just use the middle gray area of the card also if you fill the center of the camera with it. You can use your camera's histogram and the BGW target to zero in on the exposure.



cheers,
rfs
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Re: vortex warmimg cards
Old 11-20-2005, 09:29 AM   #4 (permalink)
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thanks for your replys. I've been using that same target for about two years to set my exposure and white balance. The problem is that the warming cards are so small that if I get it close enough to the lens to fill the frame my on camera flash blows it out or I have to change my exposure to compensate, then reset my exposure for the shot. I was really looking for some advise on how to use these cards properly. Currently I shoot with a Fugi S3, sigma 500dg super flash on a flip bracket, and a sigma 28-105 lens primarily. I've only gotten 2 replys so I suspect that know one is really using these cards, and they're just adjusting the white balance with the presets on camera.
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Re: vortex warmimg cards
Old 11-20-2005, 09:39 AM   #5 (permalink)
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There are two sizes of the warming cards, but even the largest size is a bit small for filling the frame. You might check your camera model because some cameras only require filling the center circle in the view finder with the WB reference. I usually would prefer to do the warming however in post processing so I just use a custom WB using the graycard of the target (on my Canon 20d you only need get the center circle filled with gray or white). Then in PS RAW converter I push the WB a little warmer if needed. In studio shooting I just set to 5800K and that seems to work very well and gives about the same results as the warm cards.

Cheers,
rfs
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Re: vortex warmimg cards
Old 11-20-2005, 07:59 PM   #6 (permalink)
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Thanks again for your help. I finally figured out how to use the cards with the Fugi S3, you have to place them about three feet from you and zoom in ,you can't hold them in your hand as the flash on camera blows them out. They are working great now I even test shot today with them and you can definately see the difference. I took a look at your portfolio, great work I like your style, hope to see more.
John
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