Einst_Stein Posted June 18, 2019 Share #1 Posted June 18, 2019 Advertisement (gone after registration) M240 has a very annoying dirty detection feature that makes the dirty never completely go away. No matter how I clean it, be with gel, electrical static motorized brush, lens pen, and swab + sensor cleaning liquid, M240 dirty detection always finds some dirts left on the sensor. But if I use normal exposure, with f16 or f32, to shoot a white background (out of focus), the dirts are invisible. Should I care? or should I investigate better cleaning method/skill ? Link to post Share on other sites More sharing options...
Advertisement Posted June 18, 2019 Posted June 18, 2019 Hi Einst_Stein, Take a look here m240 Annoying Sensor Dirty Detection Feature. I'm sure you'll find what you were looking for!
jdlaing Posted June 18, 2019 Share #2 Posted June 18, 2019 Simple solution. Stop using that feature. If no spots show on images you have achieved success. Link to post Share on other sites More sharing options...
Einst_Stein Posted June 18, 2019 Author Share #3 Posted June 18, 2019 1 hour ago, jdlaing said: Simple solution. Stop using that feature. If no spots show on images you have achieved success. Is that really true? Link to post Share on other sites More sharing options...
250swb Posted June 18, 2019 Share #4 Posted June 18, 2019 Even with the M240 (and M10) having that feature I never use it. Instead I still do the old school trick of stopping the lens down and make a photograph of the sky, of course ensuring there are no birds flying about. Link to post Share on other sites More sharing options...
dau Posted June 18, 2019 Share #5 Posted June 18, 2019 I used to find the function quite useful. However, it's quite important to recognize when to stop cleaning. Specks and smears which you can not see in the photograph don't matter. Even visible dirt might not matter, depending on where in the image it appears. So: use the dirt detection in the camera as a guideline. After cleaning, take a photograph of a blurred featureless area such as the sky or a blank wall. If you can't see the dirt proclaimed by the camera or if it's too faint to bother or in a place where it won't matter, stop cleaning. Link to post Share on other sites More sharing options...
jaapv Posted June 18, 2019 Share #6 Posted June 18, 2019 6 hours ago, Einst_Stein said: M240 has a very annoying dirty detection feature that makes the dirty never completely go away. No matter how I clean it, be with gel, electrical static motorized brush, lens pen, and swab + sensor cleaning liquid, M240 dirty detection always finds some dirts left on the sensor. But if I use normal exposure, with f16 or f32, to shoot a white background (out of focus), the dirts are invisible. Should I care? or should I investigate better cleaning method/skill ? I have never used the feature as it does not make sense to me. If I cannot see dirt on my photograph it is not there as far as I'm concerned, if I can see it there is a spot healing brush. I only clean my sensor for postprocessing convenience. Link to post Share on other sites More sharing options...
jdlaing Posted June 18, 2019 Share #7 Posted June 18, 2019 Advertisement (gone after registration) 8 hours ago, Einst_Stein said: Is that really true? Yes. Link to post Share on other sites More sharing options...
plaidshirts Posted June 18, 2019 Share #8 Posted June 18, 2019 5 hours ago, dau said: ... Specks and smears which you can not see in the photograph don't matter. Bingo! Link to post Share on other sites More sharing options...
Gregm61 Posted June 18, 2019 Share #9 Posted June 18, 2019 If you use f16 or smaller apertures there's going to be more going on from diffraction rather than dust specs that will degrade your photos. There aren't too many times I'm stopped down smaller than f8 and more often it's in the f4 or f5.6 range. At those apertures, it's going to need to be a pretty darn big spot of dust to show up in the images, assuming it's in an open area of the image that'd show up to begin with.. 1 Link to post Share on other sites More sharing options...
Exodies Posted June 19, 2019 Share #10 Posted June 19, 2019 I find dust is only a problem in the sky. The rest of the world is mottled anyway. 2 Link to post Share on other sites More sharing options...
david strachan Posted June 19, 2019 Share #11 Posted June 19, 2019 Can be a problem on faces eg portraiture. Difficult to do perfect cloning or healing on skin. ... Link to post Share on other sites More sharing options...
jaapv Posted June 19, 2019 Share #12 Posted June 19, 2019 Content Aware repair tools are quite effective in my experience. 1 Link to post Share on other sites More sharing options...
Exodies Posted June 19, 2019 Share #13 Posted June 19, 2019 4 hours ago, david strachan said: Can be a problem on faces eg portraiture. Difficult to do perfect cloning or healing on skin. ... I have one word for you - birthmark. 1 Link to post Share on other sites More sharing options...
Einst_Stein Posted June 19, 2019 Author Share #14 Posted June 19, 2019 Turn it into a philosophical question： When facing the imperfection of the truth, would you choose make it perfect by all means, choose not to know the truth, accept the imperfection, or pretend it does not matter? Link to post Share on other sites More sharing options...
Michael Geschlecht Posted June 19, 2019 Share #15 Posted June 19, 2019 (edited) Hello Einst_Stein, There is another thing to think about: Mechanical devices are like people in that: The less you take them apart or/& fiddle with them: The happier they are. Each time you clean a surface which is for all intents & purposes the same after you clean it as it was before you cleaned it: You take away something. Each time you do NOT clean a surface which is for all intents & purposes the same after you clean it as it was before you cleaned it: You do NOT take away anything at all. It is generally better to do NO harm, however minor, than it is to do SOME harm, however minor. Best Regards, Michael Edited June 19, 2019 by Michael Geschlecht Link to post Share on other sites More sharing options...
jdlaing Posted June 19, 2019 Share #16 Posted June 19, 2019 ob·ses·sive–com·pul·sive /əbˌsesivkəmˈpəlsiv/ adjective PSYCHIATRY denoting or relating to a disorder in which a person feels compelled to perform certain stereotyped actions repeatedly to alleviate persistent fears or intrusive thoughts. "some people spend less than an hour engaged in obsessive-compulsive behavior— for others it may consume their whole day" Link to post Share on other sites More sharing options...
Michael Geschlecht Posted June 20, 2019 Share #17 Posted June 20, 2019 10 minutes ago, jdlaing said: ob·ses·sive–com·pul·sive /əbˌsesivkəmˈpəlsiv/ adjective PSYCHIATRY denoting or relating to a disorder in which a person feels compelled to perform certain stereotyped actions repeatedly to alleviate persistent fears or intrusive thoughts. "some people spend less than an hour engaged in obsessive-compulsive behavior— for others it may consume their whole day" Hello JD, Sometimes. In some situations people do things the way they do because they have insufficient references. It is good that Forums like this provide a place where people can ask questions & find the information that helps them to determine what to do. Best Regards, Michael Link to post Share on other sites More sharing options...
jmahto Posted June 20, 2019 Share #18 Posted June 20, 2019 (edited) 1 hour ago, Einst_Stein said: Turn it into a philosophical question： When facing the imperfection of the truth, would you choose make it perfect by all means, choose not to know the truth, accept the imperfection, or pretend it does not matter? You are right. Imperfection can't be accepted. As for dust, it can appear even from shot to shot. Too much happening between sensor and rear element that I can't trust. From now on I will either i) clean my sensor before each shot or ii) clean it after every N shots but examine ALL pixels later for each shot in LR carefully. Can't decide whether to go with i or ii. Please HELP. Edited June 20, 2019 by jmahto Link to post Share on other sites More sharing options...
Exodies Posted June 22, 2019 Share #19 Posted June 22, 2019 (edited) I have a mark on a print. Can’t decide whether to reprint it. It’s only visible at certain angles. It is about 5mm diameter. I wonder if it’s a water drop. 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! It doesn’t hurt my eye but it hurts when people point it out. Edited June 22, 2019 by Exodies Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! It doesn’t hurt my eye but it hurts when people point it out. ' data-webShareUrl='https://www.l-camera-forum.com/topic/298416-m240-annoying-sensor-dirty-detection-feature/?do=findComment&comment=3764214'>More sharing options...
Einst_Stein Posted June 22, 2019 Author Share #20 Posted June 22, 2019 Looks like a (perfect) circle. Unlikely. Are you sure it is not the object itself? Link to post 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