Einst_Stein Posted January 23, 2015 Share #1 Posted January 23, 2015 (edited) Advertisement (gone after registration) Reading that using small aperture can help to identify the dirty sensor. I did an experiment, this is what I got, can someone tell me if this is the fungus or just dust. Note the big dark spot in the bottom right, which disappeared after blowing with the air ball. SO that one is clearly the f]dust, but the smaller spots on the right top and right side remain. Also please note that the funny circle around the dark spot, it's not real, it's just the photoshop effect after I convert the image to 1024x682. Thia firum nly accept imgae size up to 1024x024. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Edited January 23, 2015 by Einst_Stein Quote Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/240179-fungus-or-dust/?do=findComment&comment=2751738'>More sharing options...
Advertisement Posted January 23, 2015 Posted January 23, 2015 Hi Einst_Stein, Take a look here fungus or dust?. I'm sure you'll find what you were looking for!
jaapv Posted January 23, 2015 Share #2 Posted January 23, 2015 Knee-jerk reaction: Dust. I would use a stamping tool; EyeLead or Pentax. 1 Quote Link to post Share on other sites More sharing options...
jdlaing Posted January 23, 2015 Share #3 Posted January 23, 2015 Dust. 1 Quote Link to post Share on other sites More sharing options...
250swb Posted January 23, 2015 Share #4 Posted January 23, 2015 Yes, dust. Steve Quote Link to post Share on other sites More sharing options...
pico Posted January 23, 2015 Share #5 Posted January 23, 2015 The spot on the lower right is only 6 pixels on the image, and only 3 of them are dark. Regardless, it is insignificant. Running a quick macro on the frame is sufficient and trivial, and it if using LR it might be automatically fixed. I'm a bit crabby this morning, but such attention to minutiae reminds me of an unfortunately obsessive hypochondriac we had at the hospital when I was a medic. He would sieve his feces looking for issues. Quote Link to post Share on other sites More sharing options...
Einst_Stein Posted January 24, 2015 Author Share #6 Posted January 24, 2015 1. How do you tell it's dust or fungus? dark spot = dust, bright spot = fungus? Is it because the fungus ate up the glue and created a small spot "lens"? 2. I'm curious why smaller aperture can better reveal those stuffs? I can understand if the dust is on the surface of the glass, which has some distance to the sensor due to the thickness of the glass, then with wider aperture, the light has more change to soft the shadow of the dust, thus smaller aperture can harden the shadow. It's sort of the soft light source (with large bowl or large reflector) vs. hard light source (small single point light). It's good to know it's not fungus. I have never touch the sensor except blowing it with air ball. Blowing does not clean these spots. Any suggestion? Quote Link to post Share on other sites More sharing options...
Trivette Posted January 24, 2015 Share #7 Posted January 24, 2015 Advertisement (gone after registration) 1. How do you tell it's dust or fungus? dark spot = dust, bright spot = fungus?......Fungus usually first shows up as a thin filament, not a spot. Quote Link to post Share on other sites More sharing options...
jdlaing Posted January 24, 2015 Share #8 Posted January 24, 2015 1. How do you tell it's dust or fungus? dark spot = dust, bright spot = fungus?Is it because the fungus ate up the glue and created a small spot "lens"? 2. I'm curious why smaller aperture can better reveal those stuffs? I can understand if the dust is on the surface of the glass, which has some distance to the sensor due to the thickness of the glass, then with wider aperture, the light has more change to soft the shadow of the dust, thus smaller aperture can harden the shadow. It's sort of the soft light source (with large bowl or large reflector) vs. hard light source (small single point light). It's good to know it's not fungus. I have never touch the sensor except blowing it with air ball. Blowing does not clean these spots. Any suggestion? It needs a wet clean. Quote Link to post Share on other sites More sharing options...
jaapv Posted January 24, 2015 Share #9 Posted January 24, 2015 As I said: EyeLead stamping tool. It lifts almost everything and is easy to use. I have not wetcleaned a sensor since I got one. Tip: Blow the sensor first to remove loose particles. Wiggle (Not swipe!) when lifting off. 1. How do you tell it's dust or fungus? dark spot = dust, bright spot = fungus?Is it because the fungus ate up the glue and created a small spot "lens"? 2. I'm curious why smaller aperture can better reveal those stuffs? I can understand if the dust is on the surface of the glass, which has some distance to the sensor due to the thickness of the glass, then with wider aperture, the light has more change to soft the shadow of the dust, thus smaller aperture can harden the shadow. It's sort of the soft light source (with large bowl or large reflector) vs. hard light source (small single point light). It's good to know it's not fungus. I have never touch the sensor except blowing it with air ball. Blowing does not clean these spots. Any suggestion? Quote Link to post Share on other sites More sharing options...
pico Posted January 24, 2015 Share #10 Posted January 24, 2015 It needs a wet clean. If we are speaking of Einst_Stein's sensor, the only artifact is the little three-pixel spot on the right, I would not clean it at this time. It is more likely the cleaning will add dust. (It is so rare that I differ with jdlaing that we might be speaking of different samples.) Quote Link to post Share on other sites More sharing options...
jdlaing Posted January 24, 2015 Share #11 Posted January 24, 2015 Well, let me delve a little deeper. If you zoom in on those two images posted, there appears to be some smears, spots, possible oil on the cover glass. Wet cleaning it, in my opinion from having done it a few times, sets the cover glass up for easier cleaning later. If you get the static dissipated and oil removed down to a level that all you get is a little dry non sticky dust on it it will be easier to remove with a rocket blower or arctic butterfly. 1 Quote Link to post Share on other sites More sharing options...
250swb Posted January 25, 2015 Share #12 Posted January 25, 2015 I agree, a wet clean sets the sensor up for easier cleaning later on. First a fluid to remove grease such as Visible Dust Smear Away, but ironically these can cause a fog like smear themselves, so I then use a general fluid which gets the sensor sparkling clean, followed finally with an Eyelead or Visible Dust Arctic Butterfly. After just a couple of wet cleans early in the camera's life dust can be dealt with from then on using an Eyelead or Arctic Butterfly. Steve Quote Link to post Share on other sites More sharing options...
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