70-200mm 2.8 IS mkii vignetting in the corner problem. Can someone help me?

[jhpeterson]

I don't understand. How can a filter cause additional vignetting if it's not mounted on the lens?

What I meant to say was that it didn't matter whether or not I used a filter, I still had the problem with vignetting. Sorry if I didn't make myself more clear.

[neuroanatomist]

I don't understand. How can a filter cause additional vignetting if it's not mounted on the lens?

What I meant to say was that it didn't matter whether or not I used a filter, I still had the problem with vignetting. Sorry if I didn't make myself more clear.

Yes, the bare lens has optical vignetting.  So does the >$11K 400/2.8 II - in fact, that lens has more than the 70-200 II. But that's not the issue were discussing here.

[neuroanatomist]

I would like to make one additional observation.  In the updates to several f/2.8 zooms (16-35, 24-70, 70-200 IS), Canon has improved the optical quality, in particular they have reduced optical vignetting of the lens by 1/3 to 1/2 stop.  For the UWA and standard zoom lenses, they also increased the filter diameter from 77mm to 82mm, whereas they left the 70-200 II at 77mm.  Granted, a telezoom lens is a different design, but still it's possible that a consequence of not increasing the filter diameter is an increase in vignetting when a filter is mounted.

[ScottyP]

This is bad.  I'm afraid nothing can be done.  It is ruined.  Please send the worthless lens (with useless tripod mount and the now moot zipper case) to my house for disposal.  I will cover your shipping.    

[bornshooter]

This is bad.  I'm afraid nothing can be done.  It is ruined.  Please send the worthless lens (with useless tripod mount and the now moot zipper case) to my house for disposal.  I will cover your shipping.   

i like your thinking lol