Can I jump in here please?
I too have a Nikon d800 and I wanted to do landscape but only had a Nikon 24-77mm f2.8 lens with me. So what I did was take several photos and overlapped by a third on each, then stitched them together. seemed to work out well as below
This is a jepg from original RAW
the exif data should stll be there. If not here is part of it
Standard Information
Make: NIKON CORPORATION
Model: NIKON D800
Software: Adobe Photoshop Elements 14.0 (Windows)
ImageSize: 15936x6650
CreateDate: 2015:10:19 11:33:44
ModifyDate: 2017:10:29 11:25:45
DateTimeOriginal: 2015:10:19 11:33:44
ExposureTime: 1/1250"
Aperture: F3.2
MaxAperture: F2.8
CircleOfConfusion: 0.030 mm
HyperfocalDistance: 50.96 m
ExposureProgram: Manual
ExposureBiasValue: 0
MeteringMode: Multi-segment
Flash: Off, Did not fire
ISO: 400
WhiteBalance: As Shot
FocalLength: 70.0 mm
FocalLength35efl: 70.0 mm (35 mm equivalent: 70.0 mm)
SensingMethod: One-chip color area
SceneType: Directly photographed
ColorSpace: sRGB
Contrast: Normal
Saturation: 0
Sharpness: 25