Cleaning Lenses -- I just discovered that my lenses have a back end!

[wparsonsgisnet]

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So, I was getting ready for a shoot this weekend and cleaned the lenses I planned to use.  For no particular reason, I looked at the back end of one of the lenses and saw dark dust on it.  I then cleaned the back of all of my lenses; each was dirty on the back end.

I know this surface is part of the optical system and wonder why I never noticed these spots in the image.  I am thinking that this end of the lens is not in focus and therefore the spots are not sharp.

Anyway, I'm reformed, now.

Regards to all, Bill

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[jdlaing]

😃

[250swb]

It's like your dentist can always tell you a better way to clean your teeth, so is the revelation that your lens has two ends. 

[Gobert]

44 minutes ago, wparsonsgisnet said:

So, I was getting ready for a shoot this weekend and cleaned the lenses I planned to use.  For no particular reason, I looked at the back end of one of the lenses and saw dark dust on it.  I then cleaned the back of all of my lenses; each was dirty on the back end.

I know this surface is part of the optical system and wonder why I never noticed these spots in the image.  I am thinking that this end of the lens is not in focus and therefore the spots are not sharp.

Anyway, I'm reformed, now.

Regards to all, Bill

What is your cleaning method, Bill?