JamesTaylor Posted May 13, 2008 Share Posted May 13, 2008 Attached is a photo and the exif data that can be found under its right click > properties. the photo has been sent by a client for use as the backdrop to a montage. i should be able to use this exif data to match my vray camera to the settings that were used by the photographer... but i seem to be getting lost along the way!! is this exif data missing important parts or am i just not using it appropriately?? in vray we have film gate (mm) focal length(mm) and zoom factor yet i only have focal length in the exif data. the camera model is indicated so is the missing data something i can look up?? i've been down this route a few times trying to use the exif data but i've never found it useful... but i'm sure it should be!! can anyone shed some light on this for me or provide a run down of how the exif data should be used in vray?? thanks guys! Link to comment Share on other sites More sharing options...
Stephen Thomas Posted May 13, 2008 Share Posted May 13, 2008 Image? Link to comment Share on other sites More sharing options...
Nils Norgren Posted May 13, 2008 Share Posted May 13, 2008 Without more specific information it is hard to help, one thing to remember is that many digital cameras are non-full frame, so the film back is not 36mm, as it would be with normal slr film, you may need to get the exact size of the sensor. With out Nikons we use a 1.5 multiplier, which I think are a ballpark, but for precision you should know the exact size of the sensor, essentially it is a crop of a full frame image from the same lens. good luck, -Nils Link to comment Share on other sites More sharing options...
JamesTaylor Posted May 14, 2008 Author Share Posted May 14, 2008 arrh yes the image, bit of a school boy error there!! here it is... Link to comment Share on other sites More sharing options...
Stephen Thomas Posted May 14, 2008 Share Posted May 14, 2008 Some digital cameras will give you the 35mm equivalent focal length in the EXIF data. However if it doesn't then you have to use some maths to figure it out. A quick google search gave me the size of the sensor for your camera. To get the multiplier you have to divide the diagonal of 35mm film (43.3mm) by the diagonal of your sensor (in your case 8.94mm) which gives you a multiplier of 4.846. Multiply this by the 7mm focal length and this gives you 34mm focal length, which is what your max cam should be set to. Other important data to have when camera matching is time of day (from EXIF) and north position to figure out lighting. Also good idea to note camera position on a site plan and height of camera from ground as well. Alternatively, if you have dimensions for the building in question you can use max's camera match utility to input points. Generally though I end up doing it by eye using the info I already mentioned as a starting point. Link to comment Share on other sites More sharing options...
Mr-JosE Posted May 14, 2008 Share Posted May 14, 2008 You have everything you need apart from the the image sensor size. The Sony DSC-V1 uses a 1/1.8" sensor. This is 7.18 wide film gate. So use that figure in your V-Ray camera. Hope this helps Link to comment Share on other sites More sharing options...
JamesTaylor Posted May 14, 2008 Author Share Posted May 14, 2008 Thanks Guys!! Great information that i'm sure will be of use to many more people too! Link to comment Share on other sites More sharing options...
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