strange shadow on ir pics??

blueshift · 2nd July 2007

i just got time to test my ir filter.. i releashed there is a strange shadow everytime i shot with my ir filter on, the shadow always in the same pattern..

anybody can give me some clue how to solve this?

Thanks

Ichibawa · 2nd July 2007

It could benefit the pros on giving accurate pointers if you show some pics.

blueshift · 2nd July 2007

sorry, just now i forgot to put the pic link..

here is another pic that show the shadow, this one less obvious..
i used f2.8 for the pic below.. for the above one i used f11.. thanks'

night86mare · 2nd July 2007

Doesn't look like hotspot problems, unless now it's become hot STREAK problems.

Check your filter, is it clean? Is it scratched? The position of the streaks seem to be in the same place, so it's probably something to do with hardware.

blueshift · 2nd July 2007

hmm i cant see any visible scratch on the filter..

what do mean with hardware? is it my filter or my camera?

Francis247 · 2nd July 2007

Hi there,

What camera are you using?
Maybe you can provide more info so that we can better advice you. Thanks.

Ichibawa · 2nd July 2007

night86mare meant that the fault would probably lies with either the filter or the lens or the camera. Which means its a mechanical fault since the lines appear at the same place.

Maybe you can try asking your friend to try your filter to see if the fault lies with it.

blueshift · 2nd July 2007

hi Francis

I use minolta 7d with 28-75f.28D lens and the filter i use is hoya r72..

thanks ichibawa, ill try to ask someoen test the filter but i dont think i can do that soon..

silvergetz · 2nd July 2007

Maybe u can remove your UV filter if u r using it. Or try using another lens?

quekky · 3rd July 2007

maybe you can try to cover the viewfinder with your hand while shooting

pigs_can_fly · 5th July 2007

Originally Posted by blueshift

hi Francis

I use minolta 7d with 28-75f.28D lens and the filter i use is hoya r72..

thanks ichibawa, ill try to ask someoen test the filter but i dont think i can do that soon..

I'm not sure if long exposure is the cause of the problem. You might want to try shooting at a high ISO and see if the problem goes away. This will determine if long exposure is the culprit.

night86mare · 5th July 2007

Interesting, I got those streaks yesterday, they appear to be a flare problem. Hrm.

Incidentally, I was at chinese Gardens too, hehe.

adamadam · 6th July 2007

Originally Posted by night86mare

Interesting, I got those streaks yesterday, they appear to be a flare problem. Hrm.

Incidentally, I was at chinese Gardens too, hehe.

Maybe it's the streaking ghost living there.

akdwivedi · 6th July 2007

Originally Posted by adamadam

Maybe it's the streaking ghost living there.

yes.. Infra red spectrum can catch ghosts otherwise invisible to normal eye :-)

eawtan · 6th July 2007

It's a known issue with KM7d with R72, the four corners will 100% "flare", "ghost" .

I've tried several times with a friend's cam and there is no solution for this ...

2nd July 2007	#1
blueshift Member Join Date: Jul 2006 Posts: 248	strange shadow on ir pics?? i just got time to test my ir filter.. i releashed there is a strange shadow everytime i shot with my ir filter on, the shadow always in the same pattern.. anybody can give me some clue how to solve this? Thanks Last edited by blueshift; 2nd July 2007 at 06:17 PM. Reason: forgot to put the pic

2nd July 2007	#2
Ichibawa Member Join Date: Nov 2006 Posts: 254	Re: strange shadow on ir pics?? It could benefit the pros on giving accurate pointers if you show some pics.

2nd July 2007	#3
blueshift Member Join Date: Jul 2006 Posts: 248	Re: strange shadow on ir pics?? sorry, just now i forgot to put the pic link.. here is another pic that show the shadow, this one less obvious.. i used f2.8 for the pic below.. for the above one i used f11.. thanks'

2nd July 2007	#4
night86mare Senior Member Join Date: Aug 2006 Location: in your mind Posts: 19,374	Re: strange shadow on ir pics?? Doesn't look like hotspot problems, unless now it's become hot STREAK problems. Check your filter, is it clean? Is it scratched? The position of the streaks seem to be in the same place, so it's probably something to do with hardware. __________________ Gallery \| Dreamscapes 09 Pentaxian 伪君子之所以更可憎

2nd July 2007	#5
blueshift Member Join Date: Jul 2006 Posts: 248	Re: strange shadow on ir pics?? hmm i cant see any visible scratch on the filter.. what do mean with hardware? is it my filter or my camera?

2nd July 2007	#6
Francis247 Moderator Join Date: Jul 2005 Location: Hougang, Sengkang Posts: 5,348	Re: strange shadow on ir pics?? Hi there, What camera are you using? Maybe you can provide more info so that we can better advice you. Thanks. __________________ 莫问前程有愧,只求今生无悔. Time pasts, Places changed, Beauty faded, what is left are Photos of Memories…

2nd July 2007	#7
Ichibawa Member Join Date: Nov 2006 Posts: 254	Re: strange shadow on ir pics?? night86mare meant that the fault would probably lies with either the filter or the lens or the camera. Which means its a mechanical fault since the lines appear at the same place. Maybe you can try asking your friend to try your filter to see if the fault lies with it.

2nd July 2007	#9
silvergetz Member Join Date: Jun 2005 Posts: 742	Re: strange shadow on ir pics?? Maybe u can remove your UV filter if u r using it. Or try using another lens?

3rd July 2007	#10
quekky Senior Member Join Date: Sep 2003 Location: www.irphotography.com Posts: 1,377	Re: strange shadow on ir pics?? maybe you can try to cover the viewfinder with your hand while shooting

5th July 2007	#12
night86mare Senior Member Join Date: Aug 2006 Location: in your mind Posts: 19,374	Re: strange shadow on ir pics?? Interesting, I got those streaks yesterday, they appear to be a flare problem. Hrm. Incidentally, I was at chinese Gardens too, hehe. __________________ Gallery \| Dreamscapes 09 Pentaxian 伪君子之所以更可憎

6th July 2007	#15
eawtan Member Join Date: Feb 2004 Location: Tampines Posts: 1,090	Re: strange shadow on ir pics?? It's a known issue with KM7d with R72, the four corners will 100% "flare", "ghost" . I've tried several times with a friend's cam and there is no solution for this ...