Hi all,
Here is my situation. When I mount a 24-135 (f3.5-f5.6) Tamron lens and look through the viewfinder at the clear sky, there seemed to be a "misty spots" uniformly distributed throught the viewfinder. It is like looking through a super thin black cloth.
When another lens 17-50 (f2.8) is mounted, the "misty spots" cannot be seen throught the viewfinder.
I brought the lens down to the Camera Workshop and they told me that it is caused by the lens coating and can be seen when the apperture is small enough. They showed me a couple of lens (including another set of 24-135) and sure enough, the "misty spots" can be seen.
My purpose of posting this thread is to ask members here if there is any truth in the diagnosis. It is important because I'm putting this lens up for sale and I would not want to sell it if I know there is something wrong with it.
Thanks in advance.
Here is my situation. When I mount a 24-135 (f3.5-f5.6) Tamron lens and look through the viewfinder at the clear sky, there seemed to be a "misty spots" uniformly distributed throught the viewfinder. It is like looking through a super thin black cloth.
When another lens 17-50 (f2.8) is mounted, the "misty spots" cannot be seen throught the viewfinder.
I brought the lens down to the Camera Workshop and they told me that it is caused by the lens coating and can be seen when the apperture is small enough. They showed me a couple of lens (including another set of 24-135) and sure enough, the "misty spots" can be seen.
My purpose of posting this thread is to ask members here if there is any truth in the diagnosis. It is important because I'm putting this lens up for sale and I would not want to sell it if I know there is something wrong with it.
Thanks in advance.