Dear List: I am practicing the IBL simulation and run into an issue when taking HDR images of sky. I use Canon 5D 2 with a SIGMA fisheye lens. I put a Koda neutral density filter 3 between the camera and the lens before taking a sky image. However, when I put the filter in, the camera loses aperture information. When I take the filter out, the camera works normally. I can set the aperture size before taking images with filter in, but all the images I take have no aperture information and cannot be applied to hdrgen for combination. Does anyone have the same problem? What is the solution to this problem? Any suggestion is appreciated. Thank you,
-- *Zhe Kong* *PhD Student* *University of Wisconsin - Milwaukee * *School of Architecture and Urban Planning * *2131 E. Hartford Ave, Milwaukee, WI 53211 * *Office 327*
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