wstotler Posted January 16, 2008 Share #1 Posted January 16, 2008 Advertisement (gone after registration) Hello! I had some surprising and unexpected vignetting when I moved my 35mm Summicron ASPH from my M8 onto my M6TTL. I was shooting at 1/60th of a second at f/2.0. Film speed was 200. (Incident light meter indicated this was an OK combo for this environment.) I removed the UV Cut filter prior to shooting. Can someone comment if this is a normal amount of vignetting for the M6TTL, the Summicron ASPH at f/2.0, and film? (The "blown" highlights don't bother me much, BTW.) I don't see this kind of vignetting with the M8, presumably because of the crop factor? Thanks! Will P.S. I didn't see vignetting like this in my shots taken outdoors at f/5.6 with the Summicron/M6TTL combo. 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/42882-unexpected-summicron-asph-35mm-vignetting-at-f20-on-film/?do=findComment&comment=453519'>More sharing options...
Advertisement Posted January 16, 2008 Posted January 16, 2008 Hi wstotler, Take a look here Unexpected Summicron ASPH 35mm Vignetting at f/2.0 on Film. I'm sure you'll find what you were looking for!
nobbylon Posted January 16, 2008 Share #2 Posted January 16, 2008 looks pretty much same as mine sometimes, I think it depends a bit on light source. Mine doesn't vignet as much as my old ultron 35mm did though Link to post Share on other sites More sharing options...
SoFi-Chaser Posted January 16, 2008 Share #3 Posted January 16, 2008 I think, there are two reasons for this effect: 1st You can't beat physics. at f/2 there still is some vignetting. but not as much as shown here. at f/5,6 you won't recognize it, only if you shoot against the blue sky or similar objects. Did you shoot as well at f/5,6 in that room? 2nd I see darker walls in the corner on the top. But in this room, there is no light there to be reflected to your lens. At the bottom of the images I can't see the vignetting as much as in the top. But if it was the lens, it should be there (or did you use flash?). So I'm quite sure, your lens is still perfect an it's simply the light-cone of the lamps in the wall that causes this effect. regards Torsten Link to post Share on other sites More sharing options...
wstotler Posted January 16, 2008 Author Share #4 Posted January 16, 2008 Thanks for your response. I think, there are two reasons for this effect:1st <snip> Did you shoot as well at f/5,6 in that room? No, I didn't. Not enough light. That would have been a good test. But if it was the lens, it should be there (or did you use flash?) No flash--just the light in the scene. So I'm quite sure, your lens is still perfect an it's simply the light-cone of the lamps in the wall that causes this effect. I figured the lens was OK but was surprised at the amount of vignetting--couldn't determine exactly *why* the conditions in this scene would provoke it so much. Thanks for your input. Will Link to post Share on other sites More sharing options...
wstotler Posted January 16, 2008 Author Share #5 Posted January 16, 2008 looks pretty much same as mine sometimes, I think it depends a bit on light source.Mine doesn't vignet as much as my old ultron 35mm did though Thanks for the info. Will Link to post Share on other sites More sharing options...
christer Posted January 16, 2008 Share #6 Posted January 16, 2008 why don't you shoot an evenly lit greyish surface? that will show you how much the lens vignets. the sample photos you show are not relevant as the picture area is not evenly lit. Link to post Share on other sites More sharing options...
rob_x2004 Posted January 16, 2008 Share #7 Posted January 16, 2008 Advertisement (gone after registration) It looks like dark corners and shadows and light fall off to me. The way you have the subjects arranged contributes. I would have said there is probably some vignetting but them when I looked at the pattern of the second image you can see the dark increasing and decreasing entirely without consistency of vignetting. I wonder if there is any at all. You have two point sources entirely within the frame and really I think the cron has handled these pretty well. I think also you have over exposed the frame by a long shot, and the film doesnt have the latitude to handle the exposure variation. Try one with wider range, even if it means going back to lower ISO. Theres no point burning faces out. Back on topic, someone said shoot an even lit bit of card or a wall and stand teh curves on end in photoshop and you will see what the vignetting is. I am sure there is some. But I reckon it is hidden behind other stuff in this image. Link to post Share on other sites More sharing options...
rob_x2004 Posted January 16, 2008 Share #8 Posted January 16, 2008 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/42882-unexpected-summicron-asph-35mm-vignetting-at-f20-on-film/?do=findComment&comment=453904'>More sharing options...
sbelyaev Posted January 17, 2008 Share #9 Posted January 17, 2008 Mine does exactly the same.. Link to post Share on other sites More sharing options...
SoFi-Chaser Posted January 17, 2008 Share #10 Posted January 17, 2008 [...]I figured the lens was OK but was surprised at the amount of vignetting--couldn't determine exactly *why* the conditions in this scene would provoke it so much. Thanks for your input. Will Hi again, this reminds me on some phenomena I've observed in several eclipses (german abreviation of solar eclipse is SoFi ) --> the human eye or better data-treatment behind (called brain) is faaaar better in handling contrasts and dynamic range than any film or actual sensor. The wall looks OK, when you spot it in the viewfinder, but your film doesn't lie. BTW: That's why you can never make a good image of the corona with one single shot (i.e. you need several and that costs time, you mostly haven't got - the moon doesn't wait but next year it's again over 6 minutes of totality:rolleyes:) Hope that explains a little. Best regards Torsten Link to post Share on other sites More sharing options...
tashley Posted January 20, 2008 Share #11 Posted January 20, 2008 Hello! I had some surprising and unexpected vignetting when I moved my 35mm Summicron ASPH from my M8 onto my M6TTL. Hi Will, Did you take off your IR filter? I have found that on some lenses, when I move from M8 to my MP I get a little vig from the filter. Tim Link to post Share on other sites More sharing options...
xjr Posted January 20, 2008 Share #12 Posted January 20, 2008 Where is the vignetting except for uneven illumination and shadows ? Link to post Share on other sites More sharing options...
rob_x2004 Posted January 21, 2008 Share #13 Posted January 21, 2008 There isnt any. Or it is buried beneath the shadows or the uneven light. Link to post Share on other sites More sharing options...
aauckland Posted January 21, 2008 Share #14 Posted January 21, 2008 I don't believe your lens is showing any noticable vignetting, .....I simply see shadow area's created by the limited ceiling lighting. Alan. Link to post Share on other sites More sharing options...
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