bdickson 0 Posted December 14, 2003 Last weekend I used my S2 for the first time in the ocean. The setup was as follows: S2 in Aquatica housing with 8 inch dome port and shade. Sigma 14mm f3.5 lens, single Ikelite 200 strobe with custom diffuser. Settings: Camera on Hi-Res JPEG, Aperture Priority at f8, strobe on half power manual. The conditions were mostly overcast, with very poor visibility. I shot about 100 images, and on about 20 of them two patches of light can be seen as in the sample attached. I'm at a loss to know what is causing this. Does anyone have any suggestions? Share this post Link to post Share on other sites
james 0 Posted December 14, 2003 That is lens flare caused by direct sunlight striking the lens front element from an angle. It may also be light from your strobes. Your strobes should be positioned behind the plane of your camera when shooting wideangle. Cheers James Share this post Link to post Share on other sites
bdickson 0 Posted December 15, 2003 Thanks James. I think I can eliminate sunlight, it was a real dull overcast day. Strobe reflection is a possibility, however I used the same port, lens and strobe with my N90S (remember film?) housing for several years and never saw anything like this. Bruce Share this post Link to post Share on other sites
marriard 0 Posted December 15, 2003 Thanks James. I think I can eliminate sunlight, it was a real dull overcast day. Strobe reflection is a possibility, however I used the same port, lens and strobe with my N90S (remember film?) housing for several years and never saw anything like this. Is it on your topside images as well? If it is on the topside images as well it could be dust on the CCD (which can be cleaned)or on the lens. If not it could be on the port itself. It is most likely lens flare if this is a new dome for you. Do you have a dome shade on this port? M Share this post Link to post Share on other sites
james 0 Posted December 15, 2003 I can even tell you have a red/orange strobe from the flare...:-) Cheers James Share this post Link to post Share on other sites
bdickson 0 Posted December 15, 2003 I can even tell you have a red/orange strobe from the flare...:-) Yes, the Ikelite 200 is a "warm" strobe. I'm fairly well convinced that this is flare from the strobe catching the port at just the right(wrong) angle. The fact that the marks show up on only 20 percent of the underwater images and on none of my above water images rules out CCD dust etc. I'll experiment with strobe positioning next time I'm in the big pond. Bruce Share this post Link to post Share on other sites
james 0 Posted December 15, 2003 You can also experiment in the swimming pool beforehand. You'll be able to work out the bugs there so that you can get "flare free" shots on your next dive. Cheers James Share this post Link to post Share on other sites
