DC10Tim From United Kingdom, joined Jan 2005, 1406 posts, RR: 13 Posted (9 years 11 months 2 weeks 2 days 14 hours ago) and read 3564 times:
I've just done a very quick edit on the shot below, as I've realized it's not level, yet I have "levelled" it with the horizon of the grass in the distance. Look at the building on the far left, and it would appear to need some CCW rotation. The problem with this is that it would make the whole shot appear to be sloping, so in an instance such as this what should I do?
It shows the same piece of background, but at a wider angle. I also used the grass horizon to level this photo, but you can see in the wider angle shot that the ground is not level - i.e. it rises from the left edge of my photo, then drops again to the right edge. Hence there's a bit of a hump in the middle (underneath the belly of my 757). Thus I was able to level the photo using the right and left ends of the grass horizon, ignoring that little hump in the middle. You have the 'hump' towards the right, so effectively are using a horizon that will be slightly sloped. Make that look level, as you have done, and everything else will be 'pulled' slightly in a CW direction - hence the apparent need for CCW rotation.
I hope I am getting across what I am trying to say. In essence, if that grass horizon extended to the right of your crop, it would drop down and, if you then used the 'new' right end of it, I think the verticals in the left of the shot would look okay.
Put all this in a comment to the screener - that grass slope is misleading you and the background verticals should be vertical - especially that one just to the left of the engine cowling. You can use my photo if you like to illustrate that little hump in this area.
There - too long a post once again! I just can't seem to help myself .