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Lažne boje zbog IR filtra

 
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HrAstro



Joined: 04 Aug 2006
Posts: 27

PostPosted: 04.09.2006 12:06    Post subject: Lažne boje zbog IR filtra Add user to your forum ignore list Reply with quote

sa ovim nekak sumnjam da ste se susreli, ali..
bavim se astrofotografijom kao hobijem.. tj. snimanje svemira (maglice, skupovi, galaksije bla bla)
koristim 300D i imam jedan problemčić!
naime, ekspozicije su duge (od 1min pa na dalje) i ono što mi se dešava jest da IR filtar na čipu mi blokira i dio R, a B i G su netaknuti.. Time zapravo dobivam lažne boje
Jedno rješenje je izvaditi taj filtar, ali otpada jer onda fotić nije baš za normalno fotkanje (a nemam love za dva fotića trenutno)!
Drugo je matematika koje djelomično rješava problem! Bi netko znao funkciju koliko vremenom zaostaje R kanal u odnosu G i B?

inače, onaj ko ima love kupuje B/W ccd prilagođen za duge ekspozicije i fotka 3 fotke, za svaki kanal kroz filter po jednu.. 4MPx kamera košta 6000$ i to jeftinija

a kolka je razlika između jednog i drugog
http://www.allaboutastro.com/Astrophotos/ST10images/M42/M42rgbst101000.jpg (to sa astronomskim ccd)
http://www.allaboutastro.com/Astrophotos/CanonSLR/SwordofOrion/SwordofOrion1000.jpg (Ovo je baš sa 300D)
p.s. zvijezde su okrugle, il sa šiljcima.. to ovisi o tipu teleskopa
p.s. s. fotke nisu moje Very Happy
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chris



Joined: 28 Oct 2005
Posts: 151
Location: Zagreb

PostPosted: 04.09.2006 12:33    Post subject: Add user to your forum ignore list Reply with quote

ovo ću pogledati kad dođem s posla i javim se....

trebalo bi se poigrati curvesima i time bi čini mi se riješio problem...spremiš akciju i više nema brige.

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