I have no problem see the bird it a nice shot and good color .
Nice shots ,the thing that amazes me is the stratus layers just can't imagen what was happened between layers something to think about .
2X is usually to much for 4.5 aperture l.
dido maybe they don't like you.
Maybe he doesn't know how to use a computer.
To keep dust out of your camera always point your camera down when changing lens ,to clean it use a lens brush to wipe it off keeping the camera lens opening facing down .
You can get this lens from Nikon for the same price as a referb that the way I would go
They feel that 99 present of people hue buy higher end and mid priced camera should know how to use a camera plus cameras are not that complicated.
I don't think so these contacts are sliver in cameras not plain metal not like rca plugs
I just use a back pack what are going to do when you are going up a hill or crossing a creek or going up steps ?
You will not see a difference between iso 100 and iso 400 you are thinking to much you are making a job out of fun I personally have better thing to think about my health my family and what I'm going to have for supper.
Its not useless when you shooting at a 30 deg angle you monopod will de sticking out at 30 deg think about it.