Reflection by ctfchallenge

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21-FEB-2009	tvsometime

Try some pinhole photography if you want to see just how really dirty your sensor is. Next step: try using dust delete data.

Canon EOS Digital Rebel XTi ,Pinhole in aluminum foil
1s f/1024 iso100 hide exif

other sizes: small medium original auto

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ctfchallenge		22-Feb-2009 17:08
I've never tried pinhole photography but this is very intriguing! Definitely OOF! :-) CJ

ctfchallenge		22-Feb-2009 05:50
Rod, the dark dots are on the sensor. So much for Canon's "sensor cleaning". I was able to blow of most of them with a hand air blower. -tv

ctfchallenge		22-Feb-2009 05:47
the tilts all this way and that add to the confusion. Nice going. Penny Street

Rod		22-Feb-2009 01:31
I thought the dots were sort of bokeh as there's light dots & dark dots. Are the dark sort of dots on the house dust spots? If they're they hardly affect a picy like this a.

ctfchallenge		22-Feb-2009 00:37
Thanks Doug. I did some pinhole paper negatives that way back when. Thanks Brent, it remeinded me that I've never cleaned the sensor. A few puffs of air cleared out most of it (after this picy) but there's still some persistent dots which I suspect are going to be troublesome except with larger apertures than a pinhole. Rod, this is the one with the "grain" if you get a good monitor you will see clearly random dots. On subsequent images like the portrait, I cloned out the worst of them. It's probably about a 9.234 Mpxl sensor at this point. -tv

Rod		21-Feb-2009 21:36
Great idea for this topic Tommy, well done mate. I didn't see the picy with the dust spots, when you use dust delete data does it map out & not use the pixels where the dust is? I was wondering if so you will end up with a 4 MP sensor if it was that dirty.

ctfchallenge		21-Feb-2009 16:15
Cool idea Tommy. I expect most any camera would look like you sneezed all over the image given this test. I'm going to try this sometime for fun- after cleaning my sensor :-) ~Brent

COAmature		21-Feb-2009 16:02
I thought the thick grain was nifty looking until I read where it was coming from. I remember doing pinhole photography in high school. We put a pinhole in the front of a box that had photo paper inside it that absorbed the light. The exposure took quite some time and was obviously black and white but the lessons we learned about the pinhole size vs exposure time would carry over into newer technology. -Doug

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