LeCharlesMuhDickens Posted February 25, 2016 Share Posted February 25, 2016 Trying to shoot some pics but I've got red spots/grain everywhere. Using a rebel XTI with stock lens, shooting at f11, ISO 800, 1/125. Tried coming down a few stops to no avail, pics look god awful. I've got a 50mm f/1.8 I can use but it doesn't seem to focus unless I'm about a foot off the glass. Any ideas? Link to comment
uwphoto Posted February 25, 2016 Share Posted February 25, 2016 Can you post a pic? I would come down on the ISO first. On a tripod? Link to comment
LeCharlesMuhDickens Posted February 25, 2016 Author Share Posted February 25, 2016 I'll put up an example once I get back to my PC. I've just been shooting sans tripod, never experienced the red specks before. Link to comment
TFish77 Posted February 25, 2016 Share Posted February 25, 2016 Weird. Yeah some examples would help Link to comment
LeCharlesMuhDickens Posted February 25, 2016 Author Share Posted February 25, 2016 no Idea whats up with the camera Link to comment
jolee0722 Posted February 25, 2016 Share Posted February 25, 2016 Nice pics. Might be cyano which forms red patches in low flow areas of the tank. A pic of the red spots would help. Link to comment
tetraodon Posted February 25, 2016 Share Posted February 25, 2016 can you adjust your lights at all? i remember seeing something similar when i would take pics with less than ideal lighting. im by no means a camera expert though. Link to comment
LeCharlesMuhDickens Posted February 25, 2016 Author Share Posted February 25, 2016 can you adjust your lights at all? i remember seeing something similar when i would take pics with less than ideal lighting. im by no means a camera expert though. I fiddled with lighting but it seemed to make it more intense. The spots are tough to see in the pic, but if you zoom in its like red noise all over, especially in the black areas. Nice pics. Might be cyano which forms red patches in low flow areas of the tank. A pic of the red spots would help. If you zoom in you can see all of the noise in the dark areas especially. It's kind of hard to see in the photo but shows up like mad in GIMP when zoomed in a tad. Link to comment
tetraodon Posted February 25, 2016 Share Posted February 25, 2016 I fiddled with lighting but it seemed to make it more intense. The spots are tough to see in the pic, but if you zoom in its like red noise all over, especially in the black areas. then it might be tied to the lighting then, what did you try? Link to comment
LeCharlesMuhDickens Posted February 25, 2016 Author Share Posted February 25, 2016 then it might be tied to the lighting then, what did you try? I've tried turning up the room lights and running blues off and on during the pictures. Seems like the more light there is, the more prevelant the red spots are. Maybe I'll try lowering the lights and shooting longer exposure. Link to comment
tetraodon Posted February 25, 2016 Share Posted February 25, 2016 can you move the lense closer to the glass? it could be some sort of refraction Link to comment
LeCharlesMuhDickens Posted February 25, 2016 Author Share Posted February 25, 2016 can you move the lense closer to the glass? it could be some sort of refraction I've got it right against the glass in that picture. Do you think shooting through a porthole would help? Link to comment
tetraodon Posted February 25, 2016 Share Posted February 25, 2016 I've got it right against the glass in that picture. Do you think shooting through a porthole would help? try it top down with no flow first and see what it does, the most common problem for me was a blue washout Link to comment
LeCharlesMuhDickens Posted February 25, 2016 Author Share Posted February 25, 2016 I feel dumb, removed UV filter and.... Link to comment
tetraodon Posted February 25, 2016 Share Posted February 25, 2016 *face palm* nice goby though Link to comment
LeCharlesMuhDickens Posted February 25, 2016 Author Share Posted February 25, 2016 Giant face palm, I was at the zoo last time I used the stock lens, must have stuck the filter on and forgot about it. Good news is the goby posed for a new shot. Link to comment
uwphoto Posted February 26, 2016 Share Posted February 26, 2016 Surprised a UV filter would make that much difference. It doesn't cut any light out. Sure it wasn't a Polarizer? Link to comment
LeCharlesMuhDickens Posted February 27, 2016 Author Share Posted February 27, 2016 Surprised a UV filter would make that much difference. It doesn't cut any light out. Sure it wasn't a Polarizer? Yep, just a cheesy Hoya UV filter. It's odd ain't it? Link to comment
uwphoto Posted February 27, 2016 Share Posted February 27, 2016 If you hold just the filter to the sky does it have a "color" to it. Some of the UV filters are also "warming" filters. Still strange. (BTW is that a JRT avatar?) Link to comment
rickztahone Posted March 15, 2016 Share Posted March 15, 2016 Yep, just a cheesy Hoya UV filter. It's odd ain't it? It really isn't. A filter offers light to bounce from in between the filter and the outer lens. What you were experiencing was simply a prism of light from your light fixture. A lens hood should have helped with this. Were you shooting without one? This "phenomenon" is also referred to as "flare" Link to comment
Polarcollision Posted March 15, 2016 Share Posted March 15, 2016 no Idea whats up with the camera are you shooting in full auto or aperture priority mode? That def looks like high ISO noise. If it ever shows up again with the UV filter off, check ISO. Link to comment
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