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expodisc ?
Old 02-06-2005, 09:22 PM   #1 (permalink)
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I'm just curious, anyone use and recomend/ not recomend this product?

http://www.expodisc.com/products/exp...disc.html#warm

Thanks in advance

Brian
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Re: expodisc ?
Old 02-07-2005, 02:08 AM   #2 (permalink)
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I have one and it is great. I'm thinking of getting a second one just for work (Las Vegas wedding photographer). Make sure you buy the size that fits your largest filter size. On your smaller lenses simply hold it against the front of the lens. It works as a white balancer and also as both an incident meter and a studio flash meter. Sorry if this sounds like a commercial but I won't be going back to gray cards.
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Re: expodisc ?
Old 02-07-2005, 08:18 AM   #3 (permalink)
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New member first post.
I've read the exposdisc website and found that for outdoor daylight use they advise aiming the camera at the sun, with exposdisc attached of course, to perform the custom white balance. They do quickly follow that up with a warning about not doing it without the expodisc attached.
I was always under the impression aiming a camera at then sun was a bad thing especially digital SLR's, bad for both the sensor and your eyes.

I'm curious to hear if this correct and the "done thing" from someone who has one?
David_L_Brown whats your "best practice" with one of these things outdoors ?


Is the expodisc that effective at reducing the suns intensity to a level safe enough for the sensor in my camera and more importantly my eyes?

Great site and great community feel here I love it.
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Re: expodisc ?
Old 02-07-2005, 10:44 AM   #4 (permalink)
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People on another forum, Fred Miranda, seem to be getting results just as good using coffee filters..
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Re: expodisc ?
Old 02-08-2005, 05:33 AM   #5 (permalink)
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Pointing at the sun is fine. When metering for exposure you aim it the same way you would a hand-held light meter so if the sun is your direct light source then that is where you aim. As far as damage to the sensor you should bear in mind that the sensor is only "exposed" during the exposure, not during the metering. As far as my outdoor shooting goes, though, I am almost always looking for "open shade", in which case I hold the camera next to the model and face back towards the shooting position to set both exposure and white balance. Each expodisc is individually calibrated to nuetral gray with 18% transmission so you can count on getting accurate color and also accurate exposure. To answer the other post about using coffee filters I have no problem with that if it works for you. I have also heard that some people are using Pringle's lids. I read that one is a little cool and the other is a little warm but I don't remember which is which. If you choose to go that way you will still have to do some correction in PS. I simply prefer to get it right in-camera if possible to reduce post-processing time. The expodisc does this for me with the bonus of also replacing my handheld meter.
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Have one...
Old 02-09-2005, 12:45 PM   #6 (permalink)
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A bit spendy but I managed to pick up a used one at a camera swap meet. I never mount it, but rather hold it against the front on my lens to fire the first frame of each set or scene change.

Later in the RAW converter, I use the WB of the first frame to apply to the rest of the images. Much quicker than setting custom WB in camera.

Works great.
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Re: Have one...
Old 02-09-2005, 03:25 PM   #7 (permalink)
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Once you shoot the shot with the expodisc it takes about 5 seconds to set the camera to use that as your custom white balance. This, then means, that when you review any shot on the LCD, it will have the correct WB as well as when you browse the shots on your computer, as most browsers use the imbedded JPG for the thumbnail. If you don't set the computer to use the CWB, then you get neither of these advantages. So spend the 5 or 10 seconds on the front end and you'll get a nice benefit.
Cheers,
rfs
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Re: expodisc ?
Old 02-09-2005, 03:27 PM   #8 (permalink)
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I always carry at least 2 of the white coffee filters in my camera bag. They work just as well as the expensive expodisc. Do a little testing as some find that 2 filters work better than 1. But a white or gray card works equally well.
Cheers,
rfs
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