djmay Posted November 1, 2016 Share #1 Posted November 1, 2016 Advertisement (gone after registration) I have done 16 second exposures without filters without problems. Using a 5-stop and 10-stop filter at 8 seconds, the image is not sharp (different locations). It looks slightly out of focus. There was not a vibration that I noticed. The same images without ND filter and no other change are in focus. Anyone have similar experiences? I will do some testing further. Jesse Sent from my Lenovo YT3-850L using Tapatalk Link to post Share on other sites More sharing options...
Advertisement Posted November 1, 2016 Posted November 1, 2016 Hi djmay, Take a look here APO 180 mm strange behaviour wit ND filters. I'm sure you'll find what you were looking for!
jip Posted November 1, 2016 Share #2 Posted November 1, 2016 infrared light contaminating the image? Link to post Share on other sites More sharing options...
jip Posted November 1, 2016 Share #3 Posted November 1, 2016 Also every piece of glass changes the focus a bit, so you should focus AFTER putting on the filter which might be difficult due to the low light. Link to post Share on other sites More sharing options...
djmay Posted November 1, 2016 Author Share #4 Posted November 1, 2016 I have done 16 second exposures without filters without problems. Using a 5-stop and 10-stop filter at 8 seconds, the image is not sharp (different locations). It looks slightly out of focus. There was not a vibration that I noticed. The same images without ND filter and no other change are in focus. Anyone have similar experiences? I will do some testing further. Jesse Sent from my Lenovo YT3-850L using Tapatalk I should add that this behavior is only with the 180. With the 30 I have done exposures at the maximum 2 minutes with no problems. With the M9 I have also experienced no problems with Elmarit-m 28 ASPH, Zeiss 50 2.0 and Elmarit-m 90. Jesse Sent from my Lenovo YT3-850L using Tapatalk Link to post Share on other sites More sharing options...
LorenzoLandini Posted November 1, 2016 Share #5 Posted November 1, 2016 Also every piece of glass changes the focus a bit, so you should focus AFTER putting on the filter which might be difficult due to the low light. With 10-stop ND is just not possible to focus after the putting on the filter, it's just too dark no matter how you do it. Link to post Share on other sites More sharing options...
albertknappmd Posted November 1, 2016 Share #6 Posted November 1, 2016 5 and 10 stop ND are difficult to focus when placed so try shooting something at infinity and see if it is out of focus. Albert Link to post Share on other sites More sharing options...
albertknappmd Posted November 1, 2016 Share #7 Posted November 1, 2016 Advertisement (gone after registration) also, repeat your original photos but make sure your technique is meticulous and make sure tripod is solid etc... No wind etc.. Optimize. Albert Link to post Share on other sites More sharing options...
John McMaster Posted November 1, 2016 Share #8 Posted November 1, 2016 Are you on continuous AF? Not sure if that might be an issue as my S2-P is kept on manual focus... john Link to post Share on other sites More sharing options...
djmay Posted November 1, 2016 Author Share #9 Posted November 1, 2016 Are you on continuous AF? Not sure if that might be an issue as my S2-P is kept on manual focus... john Always on manual focus.Jesse Sent from my Lenovo YT3-850L using Tapatalk Link to post Share on other sites More sharing options...
Arif Posted November 1, 2016 Share #10 Posted November 1, 2016 I had a similar issue with the 70mm with a 10 stop Singh Ray last week. Majority of pictures were soft/slightly out of focus. The lowest setting ones with the filter were fine. I had ruled it out as operator error but now your post makes me wonder (plus there were way too many pictures on that shoot with similar issues). I was using the 10 stop at roughly a three stop setting for lowering the background light while shooting with my profoto B2. I realise the synch speed of 1/125 used could be a factor as well but I have managed others well below this. 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/266069-apo-180-mm-strange-behaviour-wit-nd-filters/?do=findComment&comment=3140017'>More sharing options...
djmay Posted November 2, 2016 Author Share #11 Posted November 2, 2016 I had a similar issue with the 70mm with a 10 stop Singh Ray last week. Majority of pictures were soft/slightly out of focus. The lowest setting ones with the filter were fine. I had ruled it out as operator error but now your post makes me wonder (plus there were way too many pictures on that shoot with similar issues). I was using the 10 stop at roughly a three stop setting for lowering the background light while shooting with my profoto B2. I realise the synch speed of 1/125 used could be a factor as well but I have managed others well below this.I will do tests with 30, 70 and 180.Jesse Sent from my GT-I9195 using Tapatalk Link to post Share on other sites More sharing options...
albertknappmd Posted January 26, 2017 Share #12 Posted January 26, 2017 What finally happened with the tests? Albert Link to post Share on other sites More sharing options...
djmay Posted January 27, 2017 Author Share #13 Posted January 27, 2017 What finally happened with the tests? Albert Tests are pending. Other priorities came and I am preparing to move from Germany to Switzerland. In the meantime, I am not using 10-stop ND with the 180. I do plan to do the testing. Jesse Link to post Share on other sites More sharing options...
albertknappmd Posted January 28, 2017 Share #14 Posted January 28, 2017 Look forward to your report and have a safe and easy move... Albert Link to post Share on other sites More sharing options...
djmay Posted May 31, 2017 Author Share #15 Posted May 31, 2017 I have finally had the chance to test my four lenses, 24mm, 30mm, 70mm and 180mm, with 10-stop and 5-stop ND filters. The 24, 30 and 70 show no focus problems with either of the ND filters. However, the 180 exhibits a slight out-of-focus effect with both ND filters. The effect is noticeable without magnification. I photographed a sheet of music alongside a printout of a resolution chart. The distance to subject was between one and two meters. All images were shot at f8.0. With the 180, I also shot at f11 to see if the effect changed. It was slightly less at f11, which one would expect if the focus was off. All images were compared to identical shots without any filters. So, the question to 180 users; have you done shots with 10-stop or 5-stop ND filters and did you notice a focus problem? I appreciate feedback. Jesse Link to post Share on other sites More sharing options...
djmay Posted May 31, 2017 Author Share #16 Posted May 31, 2017 Without filter 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/266069-apo-180-mm-strange-behaviour-wit-nd-filters/?do=findComment&comment=3286421'>More sharing options...
djmay Posted May 31, 2017 Author Share #17 Posted May 31, 2017 With 10-stop Firecrest filter 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/266069-apo-180-mm-strange-behaviour-wit-nd-filters/?do=findComment&comment=3286423'>More sharing options...
Jeff S Posted May 31, 2017 Share #18 Posted May 31, 2017 Maybe try another filter brand... https://fstoppers.com/bestfiltertest Jeff Link to post Share on other sites More sharing options...
xiaubauu2009 Posted June 1, 2017 Share #19 Posted June 1, 2017 Did you focus first before you put on the filter? If you use 007, i suggest you use the Live view for focus, and make sure the Aperture is full open. Link to post Share on other sites More sharing options...
djmay Posted June 1, 2017 Author Share #20 Posted June 1, 2017 Did you focus first before you put on the filter? If you use 007, i suggest you use the Live view for focus, and make sure the Aperture is full open. Yes. It is not possible to focus with a 10-stop filter on the lens. Also, I use a Lee system, so the filter is already in the holder when l place it on the lens. This prevents disturbing the lens. It is possible that I moved the lens focus when placing the filter. The people at Leica Wetzlar have done a similar test after I informed them of my experience. They could not duplicate my results. I will ask them which filter they used. Jesse Sent from my Lenovo YT3-850L using Tapatalk Link to post Share on other sites More sharing options...
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