I spent quite some time over two nights observations of the Eta Carina nebula using a 16"scope,eyepieces from 13mm Nagler140x mag to 6mm Radian 304x mag, with and without a O111 filter .
I used Peter Ward's Very Deep Image and was unable to see the nebula.

It maybe that the nebula may only show up photographically,due to the dimness of the object.
The seeing was good with lots of detail seen in the Homunculus, and surrounding nebulosity