suman Posted November 8, 2004 Share Posted November 8, 2004 <img src="http://d6d2h4gfvy8t8.cloudfront.net/2863025-lg.jpg"> <p> I am wondering about the ring type formation in the middle of theframe. Can anybody explain this thingy?</p> Link to comment Share on other sites More sharing options...
akocurek Posted November 8, 2004 Share Posted November 8, 2004 Were you using a DO lens? Perhaps you were near Roswell NM? Link to comment Share on other sites More sharing options...
phule Posted November 8, 2004 Share Posted November 8, 2004 They would appear to be Newton Rings, but I'm no expert. Link to comment Share on other sites More sharing options...
bobatkins Posted November 8, 2004 Share Posted November 8, 2004 Look like interference rings to me. Scan of a glass mounted slide maybe? Link to comment Share on other sites More sharing options...
scott_ferris Posted November 8, 2004 Share Posted November 8, 2004 Hi Suman, are they on the original? I ask because they are the same pattern you can get by resizeing in the wrong way. Take care, Scott Link to comment Share on other sites More sharing options...
phule Posted November 8, 2004 Share Posted November 8, 2004 << I ask because they are the same pattern you can get by resizeing in the wrong way. >> Are you thinking of moir鿠 I would argue that the pattern in the included image is not moir麍 http://www.dpreview.com/learn/?/Glossary/Digital_Imaging/Moire_01.htm Link to comment Share on other sites More sharing options...
phule Posted November 8, 2004 Share Posted November 8, 2004 Grr. Let's try this again: moiré Link to comment Share on other sites More sharing options...
les Posted November 8, 2004 Share Posted November 8, 2004 There are actually four of them that I can see...like overlapping circles... Internal reflections causing interference ? But then why these four circulat patterns are arranged in a square box formation ? Link to comment Share on other sites More sharing options...
yy Posted November 8, 2004 Share Posted November 8, 2004 There was a thread on this here not too long ago. The reason for the rings, as far as I remember, was either a polarizer or a UV filter. Did you have one of those on? Link to comment Share on other sites More sharing options...
danny_liao Posted November 8, 2004 Share Posted November 8, 2004 If you scanned it, than it's caused by film being right on the glass surface of your holder or scanner. I believe it's called Newton Rings. I have a Nikon 8000 scanner with glass holder and occassionally I'll get those rings. But I don't know why it only happen occassionally and not all the time. Maybe someone else could explain that. Link to comment Share on other sites More sharing options...
scott_ferris Posted November 8, 2004 Share Posted November 8, 2004 Hi Rob, Don't know how to type moire, but in the article I saw this was exactly how the pattern looked depending on how you filled in the options box when resizeing. I forget where I saw the article but it was all about the best settings with regards Bicubic, Bilinear, Nearest Neibour, Bicubic Smoother etc, and what worked better for reducing image size and also enlarging image size. I though moire (typed wrong again) was to do with interferance from detailed patterns and pixel positioning, there doesn't seem to be any fine detail in the smoke or cloud, so no I don't think it is moire as I understand it. Also the pattern is most pronounced in the exact center of the image, again not consistant with moire as I understand it, but I have been wrong before. Take care, Scott. Link to comment Share on other sites More sharing options...
phule Posted November 8, 2004 Share Posted November 8, 2004 << there doesn't seem to be any fine detail in the smoke or cloud >> That's because the "cloud" is (I believe) a picture of the Northern Lights. You type moiré by first typing "moir" and then hold down the ALT key and type 0233 on the number keypad on the right side of your keyboard. Link to comment Share on other sites More sharing options...
mark u Posted November 8, 2004 Share Posted November 8, 2004 Were you photographing the Aurora? Link to comment Share on other sites More sharing options...
scott_ferris Posted November 8, 2004 Share Posted November 8, 2004 Hi Rob, I don't have numbers to the right of my keyboard! Laptops! I wish Suman would let us know what he did post exposure. Take care, Scott. Link to comment Share on other sites More sharing options...
suman Posted November 8, 2004 Author Share Posted November 8, 2004 The ring is present in the raw files (from d60 and tamron 19-35 plus UV filter). So I think it is interfearence or so what called newton. Damn it! the sky is cloudy today and I don't think I can get those shoots again tonight. BTW, is there a way to avoid this? Link to comment Share on other sites More sharing options...
suman Posted November 8, 2004 Author Share Posted November 8, 2004 here is the actual photo Link to comment Share on other sites More sharing options...
phule Posted November 8, 2004 Share Posted November 8, 2004 Page 16 of the Nov/Dec 2004 issue of Photo Techniques magazine in an article about photographing the northern lights: "Unfortunately, the properties of the auroral light require avoiding filters of any kind because they can produce concentric circles or rings. These ghost-like circles show up in the center of your image and are caused by interference patterns with the narrow spectrum of the aurora's light." Scott, Your keyboard doesn't have a sub-set (via function key) of numbers? You could try the top-row #'s, but who knows if it'll work. Link to comment Share on other sites More sharing options...
chrisjb Posted November 8, 2004 Share Posted November 8, 2004 Hi Suman after reading the Astro site you pointed us to the other day this could be a combination of using a filter plus An example of a failure due to night dew on optical elements of the lens when a warmer was not used. hope it helps Link to comment Share on other sites More sharing options...
suman Posted November 8, 2004 Author Share Posted November 8, 2004 Chris, dew or cold temperature is not an issue here and pretty sure. The rings were there in my first few shots (when condensation) and also in latest shots (where dew may be an issue). So I think newton ring stands for the best explanation of this formation. Link to comment Share on other sites More sharing options...
chrisjb Posted November 8, 2004 Share Posted November 8, 2004 No worries Suman just copied from the astro site, I`m wondering what lense and exposures you used for the shot and if you resolved the battery issue on the D60 regards Link to comment Share on other sites More sharing options...
chrisjb Posted November 8, 2004 Share Posted November 8, 2004 Sorry just noticed the lense tamron 19~35 Link to comment Share on other sites More sharing options...
michael_gordon1 Posted November 11, 2004 Share Posted November 11, 2004 do a copy/paste from charmap (Programs | Accessories | System Tools | Character Map) Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now