Guess the D40 is with the 18-55 non VR lens.There are two options.
1) single lens for 90% of the the shooting oppurtunities.
Example:
Nikkor 18-200VR
Sigma 18-200 or 18-250
Tamron 18-250 or 18-270.
2) specialized lens for 100% coverage.
Example:
10-20mm wide zoom(great for landscapes)
16-85mm or 18-105mm for standard work
70-300 or 80-400mm for telephoto work.
Another aspect to consider is all of the entry/midlevel d-SLR's sport APS-C sensors so the focal length on the lens will be multiplied.(so getting actual wide angle cover is very difficult).
The single lens solution will have great convenience but the image quality would be less than ideal and there is also the issue of distortion and lens creep.(there will be less issue with dust also).
The multi lens setup will give much more clarity at the cost of convinience and dust issues.
About brands-Tokina is the sharpest of the third party lens makers followed by sigma and tamron. Sigma lenses like the 18-250 OS are really value for money. Another aspect is how fast the lens is(but here the cost is a big concern).
My plans are:
Currenly have a 18-105VR Nikkor, and i plan to add:
1)Sigma 10-20mm/3.5f wide angle zoom(cost is about 18K from US)
2)Sigma 70-300mmVR/APO telephotozoom(cost is around the 8K mark).
My rationale is that i will have coverage from 10mm to 300mm(in 35mm format that from 18mm to over 400mm)
You can sell the 18-55 for about 5K in the open market.
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