swordmanc Posted March 15, 2020 Share #1 Posted March 15, 2020 Advertisement (gone after registration) Hello guys, Yesterday I was inspecting my fairly new 35mm summicron asph(bought last year), and I noticed that there are two visible specs between the internal glasses. They are not in the center and I don't believe they really affect image quality. I didn't notice anything in my negatives, and I barely shoot wide open unless in low light. I know this is a pretty old topic, dust are "relative", some of my other lenses also have tiny dust, but this lens is my go-to lens and the dust are more visible. So just want to share some pictures and see what's your thoughts? Do you think it's worth sending it back for cleaning? (Or will leica even bother cleaning it?) Thanks ! 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! 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/307448-dust-in-the-lens-should-i-bother/?do=findComment&comment=3931548'>More sharing options...
Advertisement Posted March 15, 2020 Posted March 15, 2020 Hi swordmanc, Take a look here Dust in the lens, should I bother? . I'm sure you'll find what you were looking for!
adan Posted March 15, 2020 Share #2 Posted March 15, 2020 Inside the lens is the one place where the light rays are least focused (all the light rays are criss-crossing each other all over the place, and not forming an image), therefore you definitely will not see, for example, visible blurs or spots in the pictures. Lens dust does not act anything like sensor dust, for example - not in the right place, optically. In theory you might get a tiny reduction in overall lens contrast from stray light bouncing off the dust, but a little math tells me those dust specks affect 0.000005% of the aperture area/light getting through, at f/2.0. My first Leica-M 35 Summicron (v.4 pre-ASPH) had about twenty black specks the size of the smallest in your sample when I bought it in 2001. Right in the center (scrapings off the aperture blades' black coating over the years, that had "pooled" in the concave glass). Produced no artifacts in the pictures whatsoever - did get me a nice price, though, once I pointed it out. Your call.... 2 1 Link to post Share on other sites More sharing options...
spydrxx Posted March 15, 2020 Share #3 Posted March 15, 2020 Totally irrelevant. Link to post Share on other sites More sharing options...
Mute-on Posted March 15, 2020 Share #4 Posted March 15, 2020 I’ve seen the same in a brand new (but display) 28 Elmarit M asph. Unavoidable with atmospheric dust and the focussing vacuum that occurs with the lens moving in and out. Nothing to worry about. Link to post Share on other sites More sharing options...
250swb Posted March 15, 2020 Share #5 Posted March 15, 2020 You would need to have many, many more dust specks for it to make a difference, and even then it would be minimal. Seeing a dust speck is a good bargaining point in buying a secondhand lens, but not great if you are selling the lens. Link to post Share on other sites More sharing options...
Ecar Posted March 15, 2020 Share #6 Posted March 15, 2020 I wish all my lenses (old and more recent) had so little dust in them...😁 1 1 1 Link to post Share on other sites More sharing options...
swordmanc Posted March 15, 2020 Author Share #7 Posted March 15, 2020 Advertisement (gone after registration) Thank you for all the responses guys! I really appreciate it! Think I will just live with that and keep shooting with it until it gets many more specks! Link to post Share on other sites More sharing options...
Good To Be Retired Posted March 15, 2020 Share #8 Posted March 15, 2020 (edited) 20 hours ago, swordmanc said: Hello guys, Do you think it's worth sending it back for cleaning? (Or will leica even bother cleaning it?) Edited March 15, 2020 by Good To Be Retired Link to post Share on other sites More sharing options...
Good To Be Retired Posted March 15, 2020 Share #9 Posted March 15, 2020 Nope. Link to post Share on other sites More sharing options...
Herr Barnack Posted March 16, 2020 Share #10 Posted March 16, 2020 (edited) Will these dust specks negatively impact your IQ? No. Will these dust specks negatively impact your Leica Owner's OCD? That's a different matter altogether... 😳 Edited March 16, 2020 by Herr Barnack 4 Link to post Share on other sites More sharing options...
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