algrove Posted August 29, 2013 Share #261 Posted August 29, 2013 Advertisement (gone after registration) I don't know if I'll ask for another. I am at a loss for what it is that could be done for this problem. I can't imagine how any amount of proper adjustment would remedy this. Have you stopped your 2 APO 50 lenses down (try f16) and looked at the LCD while shooting a subject with a darkened central zone surrounded by a lighter peripheral field? This testing is not extreme. I can invasion many situations where I would be at f5.6 and higher, shooting a scene exemplified in my images posted above. Rick-Frankly I have not tested it like that. I will have to go back through my EXIF data to see at what f stops various images were taken. I know the Overgaard shots were at 2./2.8 with 3 stop ND. No others were with ND, but some were taken with orange and red filters for MM use. Link to post Share on other sites More sharing options...
Advertisement Posted August 29, 2013 Posted August 29, 2013 Hi algrove, Take a look here APO Summicron 50/2 ASPH: Central veiling flare / fogging. I'm sure you'll find what you were looking for!
k-hawinkler Posted August 29, 2013 Share #262 Posted August 29, 2013 Oh ... never seen anything like this with the the APO50 I use with M240 and MM. That lens obviously needs a trip to Solms, either for repair or for replacement. Yes - but I have never seen the loss of central contrast that you show (actually, I have hardly seen any loss of central contrast at all). And I have been looking for it. Could you please do the test I have suggested and show the image here? Many thanks. Link to post Share on other sites More sharing options...
helged Posted August 29, 2013 Share #263 Posted August 29, 2013 Could you please do the test I have suggested and show the image here? Many thanks. Will do with several lenses in a few days time - I'm on travel without the camera now. Link to post Share on other sites More sharing options...
Rick Posted August 30, 2013 Share #264 Posted August 30, 2013 Yes but the whole image is not sharp, nowhere, even at f2.0. So someone in the endcontrol threw it in the wrong basket. I've had it with a Noctilux 1.0 once, I got my money back. Otto - These are downsized to 500 pixels on the long edge. The full size images, especially the f16, is sharp across the whole field. This characteristic of the lens is startling. Without the central flare, the lens is amazing. Link to post Share on other sites More sharing options...
Rick Posted August 30, 2013 Share #265 Posted August 30, 2013 I wanted to be fair. I wanted to be sure that what I posted was not also found in other lenses. I wanted to be sure that I wasn't just "finding" flare because, I could use the LCD to detect what might have always been there in other lenses. So, when I got home today, before it got dark, I took a quick set of pictures to compare my excellent 50mm FLE 1.4 to the APO 50. Given: It was 6pm, overcast, with the same settings for both lenses, f16, infinity focus. Nothing too difficult or unusual in the field of view. It shouldn't be hard to pick the APO out of the pair (it is the first). I really want to keep this lens, but it needs to go back. I will mention that decreasing the exposure will mostly illuminate this, but the camera picked the shutter speed from the advanced matrix setting and the shutter speed was the same for both lenses. 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/208297-apo-summicron-502-asph-central-veiling-flare-fogging/?do=findComment&comment=2408694'>More sharing options...
algrove Posted August 30, 2013 Share #266 Posted August 30, 2013 Rick I've got an idea for you, but it will have to wait until tomorrow. Link to post Share on other sites More sharing options...
lct Posted August 30, 2013 Share #267 Posted August 30, 2013 Advertisement (gone after registration) Did you do the same tests around f/5.6? Link to post Share on other sites More sharing options...
Rick Posted August 30, 2013 Share #268 Posted August 30, 2013 Did you do the same tests around f/5.6? Why? Link to post Share on other sites More sharing options...
lct Posted August 30, 2013 Share #269 Posted August 30, 2013 To see if it is less visible at more usual apertures. Link to post Share on other sites More sharing options...
Rick Posted August 30, 2013 Share #270 Posted August 30, 2013 To see if it is less visible at more usual apertures. I am not sure what you mean about more "usual apertures." I shoot probably 90% or more of my shots at f8-f16. How do you get depth of field without using f8-f16? These are the apertures that provide the best sharpness to images that have complex multiple depth layers and are very often the most interesting, to me anyway. Link to post Share on other sites More sharing options...
lct Posted August 30, 2013 Share #271 Posted August 30, 2013 You won't get the highest level of sharpness at f/16 because of diffraction. I rarely shoot that slow personally but it's just me. Anyway as far as the 50/2 apo is concerned it would be interesting to check if CVF occurs at medium apertures IMHO. Link to post Share on other sites More sharing options...
jankap Posted August 30, 2013 Share #272 Posted August 30, 2013 Well, I hope you are correct but I have my doubts.May I suggest you take the following photo. Tape a black sheet about one foot in diameter on the window from the inside. Then step back enough so that your camera sees a bright and large rim of light around it. Take a shot at f/16 from the inside against the light and show it here in this thread. That way one should be easily able to discern whether there is CVF or not. Good luck. I hope your lens works out fine and my doubts are unjustified. Thanks. Very good proposal, but the outside should be standardized too. My window offers a look into the green (trees, no golf place), for instance. Not bad, but the scene cannot be arranged by others. Jan Link to post Share on other sites More sharing options...
wattsy Posted August 30, 2013 Share #273 Posted August 30, 2013 You won't get the highest level of sharpness at f/16 because of diffraction. Sorry LCT but this is just tedious nitpicking. Wanting "the highest level of sharpness" does, I guess, depend on whether you are looking at sharpness as an end in itself (to demonstrate the technical prowess of a lens) or whether you are using it towards a compositional objective. Link to post Share on other sites More sharing options...
lct Posted August 30, 2013 Share #274 Posted August 30, 2013 I was just replying to Rick's statement according to which « these are the apertures that provide the best sharpness ». They simply do not. They provide the widest DoF that's all. Link to post Share on other sites More sharing options...
wattsy Posted August 30, 2013 Share #275 Posted August 30, 2013 I thought Rick wrote "These are the apertures that provide the best sharpness to images that have complex multiple depth layers". Link to post Share on other sites More sharing options...
lct Posted August 30, 2013 Share #276 Posted August 30, 2013 OK you're right sorry. This interesting debate is not supposed to mean that CVF is even worst at a rare aperture like f/5.6 compared to the widely used f/16 hopefully. Link to post Share on other sites More sharing options...
k-hawinkler Posted August 30, 2013 Share #277 Posted August 30, 2013 Very good proposal, but the outside should be standardized too. My window offers a look into the green (trees, no golf place), for instance. Not bad, but the scene cannot be arranged by others. Jan Thanks. Great point. I had in mind against the sky, the brighter the better. Grey sky is fine too, but I would leave out the sun. I think Rick's picture http://www.l-camera-forum.com/leica-forum/2493636-post253.html shows nicely a dark center with a fairly bright surrounding. Link to post Share on other sites More sharing options...
algrove Posted August 30, 2013 Share #278 Posted August 30, 2013 I am not sure what you mean about more "usual apertures." I shoot probably 90% or more of my shots at f8-f16. How do you get depth of field without using f8-f16? These are the apertures that provide the best sharpness to images that have complex multiple depth layers and are very often the most interesting, to me anyway. Rick I got an answer for your problem. You just need to be good with pliers and screw drivers-the metal type. 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/208297-apo-summicron-502-asph-central-veiling-flare-fogging/?do=findComment&comment=2409185'>More sharing options...
algrove Posted August 30, 2013 Share #279 Posted August 30, 2013 More examples should you decide to go for the idea of replacing some of your elements. 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/208297-apo-summicron-502-asph-central-veiling-flare-fogging/?do=findComment&comment=2409201'>More sharing options...
otto.f Posted August 30, 2013 Share #280 Posted August 30, 2013 ??? Link to post Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.