Advantage of wider lens usage with given Ground sampling distance

PIX4Dcapture
1

Hello,

Is there any advantage at all flying a wider lens if you are restricted to a given GSD?

I have been toying with the idea of switching from a 35 to a 24mm but the fact that my GSD has to be the same I would just have to fly lower so what would be the advantage?

The only advantage I could think of is that with wider lens the shutter speed could theoretically be slightly slower before seeing blurr but I doubt it would actually make a huge difference, and then the distortion would be an added issue.

Would the side of images distortion of a 24mm be an advantage to detect 3D structure at all?

Anyway if you are thinking of something else please let me know, I would love to discuss this!

Thank you

2

I think a wider lens helps with the 3D reconstruction, but would appreciate critique:
My thinking, in short, is as follows:
Working at a specified GSD and with no flight height restrictions, the advantage of a wider lens (say 20mm as opposed to 35mm) is that vegetation, buildings and man-made objects will (overall) be captured more obliquely, thereby allowing better DTM construction?
The lower flight height also cuts out haze.

3

You can find how the focal length will affect the mapping here: https://www.pix4d.com/product/pix4dcapture. By wide angle, do you mean fish eye lens? Or just changing the focal length?