This CANON LENS 19mm f/3.5 LTM/L39 got a problem in hazy elements separation on its rear internal lens doublet. The way to solve the problem is to following the standard re-cementing treatment which involves multiple process such as taking apart the two elements, thoroughly cleaning and re-cementing precisely. You may check your lens by see through the glasses from the back to the front and front to the back under the desktop light in a dim environment. If you see any unnormal haze or fog with your lens elements, try to look for a professional repairing or contact me anytime!
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