kuad82001 Posted February 19, 2019 Share #1 Posted February 19, 2019 Advertisement (gone after registration) HI there! I noticed some softening on the sides of some of my images. Not all of them but some. Sharp as a tack in the center but in some images soft of the left and right sides about halfway between the corners. I always use F8 and set it so everything from 6 feet to infinity is in focus. The times when the middle sides are soft the areas fall into the 6ft to infinity. Any advice or help will be greatly appreciated. Grateful, Dennis Quote Link to post Share on other sites More sharing options...
Advertisement Posted February 19, 2019 Posted February 19, 2019 Hi kuad82001, Take a look here Elmarit 28mm ASPH question...Soft on the sides?. I'm sure you'll find what you were looking for!
Richardgb Posted February 19, 2019 Share #2 Posted February 19, 2019 Can you upload a problem image? According to the Leica data sheet (from their website), at f/8 the lens would need to be focused at about 5m to give a depth of field range from 1.934m (slightly over 6ft) to infinity, so your image should be acceptably sharp at normal viewing distances and magnification. Quote Link to post Share on other sites More sharing options...
kuad82001 Posted February 19, 2019 Author Share #3 Posted February 19, 2019 They are sharp! Beautifully sharp but near the edges it starts to get a little soft Quote Link to post Share on other sites More sharing options...
UliWer Posted February 19, 2019 Share #4 Posted February 19, 2019 You may have a look at the MTF-graph for the lens which illustrates the resolution differences in the field of view: http://de.leica-camera.com/content/download/101882/874581/version/6/file/Datenblatt_Elmarit-M+2.8_28mm_e+(2).pdf As one would expect there is a considerable drop of resolution in the extreme sides. Though - when do you really need perfect sharpness at the exteme edges of your photos? Showing an example might be helpful though. Quote Link to post Share on other sites More sharing options...
RayD28 Posted February 20, 2019 Share #5 Posted February 20, 2019 What version of the ASPH? I recall someone saying the previous version is sharper in the corners than the newest. Quote Link to post Share on other sites More sharing options...
james.liam Posted February 20, 2019 Share #6 Posted February 20, 2019 1 hour ago, RayD28 said: What version of the ASPH? I recall someone saying the previous version is sharper in the corners than the newest. ...and less so in the center compared with the new one. Seems strangely optimized for the SL rather than the M Quote Link to post Share on other sites More sharing options...
kuad82001 Posted February 20, 2019 Author Share #7 Posted February 20, 2019 Advertisement (gone after registration) Thank you for the replies. I will try to post some images. I just had the sensor cleaned at Leica NJ this past month. I compared images prior to sensor cleaning and they do not suffer from this ailment. When I received the camera back from Leica NJ the paperwork stated that they calibrated the sensor. I wonder if that is the issue. Quote Link to post Share on other sites More sharing options...
lexontario Posted February 24, 2019 Share #8 Posted February 24, 2019 (edited) Pic taken with my elmarit 28mm @ f11 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! Edited February 24, 2019 by lexontario 1 Quote 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/294449-elmarit-28mm-asph-questionsoft-on-the-sides/?do=findComment&comment=3690060'>More sharing options...
lexontario Posted May 31, 2019 Share #9 Posted May 31, 2019 (edited) My apature ring has come completely loose it spins and only adjusts the apature if you put pressure on it. Just over a year old now. I have not used it much but I’m on vacation and is getting used. To get by I set it at f8 and leave it. Anyone else have this issue? Edited May 31, 2019 by lexontario Quote Link to post Share on other sites More sharing options...
Herr Barnack Posted June 1, 2019 Share #10 Posted June 1, 2019 6 hours ago, lexontario said: My apature ring has come completely loose it spins and only adjusts the apature if you put pressure on it. Just over a year old now. I have not used it much but I’m on vacation and is getting used. To get by I set it at f8 and leave it. Anyone else have this issue? If you bought your Elmarit 28 new, it is still under warranty. When vacation is over and you return home, don't forget to contact Leica or your Leica dealer about getting warranty service on your lens. Quote Link to post Share on other sites More sharing options...
lct Posted June 1, 2019 Share #11 Posted June 1, 2019 (edited) On 2/19/2019 at 4:58 PM, kuad82001 said: I always use F8 and set it so everything from 6 feet to infinity is in focus. [...] Depends upon magnification or enlargement. If you focus at 4 meters (13 feet), everything will look in focus from about 2 meters (6 feet) to infinity at average magnifications DoF tables are calculated for. For larger magnifications or enlargements, you must choose f/11, f/16 or f/22 to get the same DoF. Then at f/8 and 4 meters focus distance, some parts of the picture will look softer at infinity if you watch them on screen at 100% magnification, especially at edges and corners. Edited June 1, 2019 by lct Quote Link to post Share on other sites More sharing options...
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