| Joined: | Tue Apr 17th, 2012 |
| Location: | Netherlands |
| Posts: | 196 |
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You are right.
The camera's like the D5100 have no coupling with non-CPU lenses, so the camera has no way of knowing that f-stop is set on the lens.
On the other hand, in full manual mode some old lenses can be mounted on a D3nnn/D5nnn that cannot be mounted on some other DSLR Nikon camera's.
A work-around would be: mount a CPU lens (like some AF-S kit lenses) and do an exposure reading in manual mode, then mount your non-CPU lens (and check the exposure on the histogram).
Regards, Gilbert