Is the bayonet of Nikon d800 the same as that of d90?

Like the bayonet of Nikon's digital SLR camera, the lens can be universal.

Quan Huafu lens can be used on all Quan Huafu fuselage and truncated fuselage.

A truncated lens can be used for a truncated fuselage. If it is used in Quan Huafu fuselage, the installation will be fine. However, due to the different sizes of photosensitive elements, there will be black edges around them when they are used in full-frame machines.

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Ultra-wide-angle lens will not have a wide viewing angle when used on the current d90.

I don't know what your budget is Nikon original full-width wide-angle lens has the following models:

18-35 silver wide angle, the price is about 3000;

16-35 f4, the price is probably within 8000;

17-35 gold wide angle, the price is about 10000.

14-24 large light bulb, the price is around 12 thousand.

There are also some sub-factory wide-angle lenses and Nikon original wide-angle lenses, which are not recommended.

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In addition, the lens purchase suggestion is to find a reputable entity store to see and feel for yourself. Don't try to be convenient and save trouble, and don't be greedy and cheap. After all, the lens can be used for a long time, and there is no need to make the subsequent shooting troublesome for temporary convenience or petty gain.