New old lens

[Mircula]

Hello,

I recently bought an old Canon 100-300 5.6L lens 2nd hand.

It is over 10 years old and looks like it as well....

I finally managed to remove the uv filter, which was quite a challenge.

Now I noticed that there is not only dust underneath the filter, but also underneath the glas. Kind of inside the lens I guess. Is there any way to remove that dust somehow?

I attached a couple of pictures and I cannot see any sign of the dust on them. But not sure if I will in other shots.

What do you think of the IQ of that lens? I think it is really sharp and great colors, but i never used any L lens before so can only compare it to my other lenses. What do you recon?



Is there any way to find out when the lens was manufactured? A serial number or similar?


Thank you for your help!!!!


Cheers,

Mirc.