Hi Santiago, good to hear from you. May I ask you to elaborate this:
> Flare from the sun was quite a problem, especially as I was using a filter > behind the fish-eye. I'm still not sure if the filter in front would reduce > it, as the less flare would be compensated by the need of a longer > exposure... Still, the flare affects the lower end of the dynamic range, so > it shouldn't be an issue for the measurement of the LED itself. How did you attach the filter behind the fisheye lens? Did you simply stick it there with some glue or silicone? Or onto the sensor? > A note about ND filters, I've had very bad experiences with photography > filters, especially at high ND values. It really needs to be an optical > filter (I ended up using a combination of filters from Edmund Optics). Do you mean that the light attenuation was not what was written on the box? Or were there other issues? I assume you calibrated even the EO filter, or did you just take it at face value? Thanks for sharing your insights. Cheers Axel _______________________________________________ HDRI mailing list [email protected] http://www.radiance-online.org/mailman/listinfo/hdri
