There was no particular telescopic sight available for service rifles of the Anglo Zulu War.
In 1883 the RSAF began to experiment with three options and one "adaptation" on the sighing of the Martini Henry at ranges beyond 1000 yards, indeed since the MK3 rifles inception in 1879 accurizing shooting at ranges beyond 500 were being addressed.
In the Mk3 the sight ladder bed was set offset to give the raised sight ladder a 5 degree cant, this allowed for the natural bullet deflection curve as an effect of the rifling causing spin, similar to a footballer curving a ball from a free kick.
Option #1 took the form of a tubular brass telescope, mounted on the left hand side of the action, it had to be set at a 30 degree angle as the bullet trajectory at range was over twelve feet, it was trialled but found innefective.
Option #2 A swivelling graduated ruler, pivotted on a specially adapted bayonet band, a small folding sight was brazed to the side of the reciever which meant the firer was looking at point of aim, but the rifle was raised to allow for trajectory, as in the tubular telescope.
Option #3, which was a C1888 idea was from mr Speed, superintendent of the RSAF, he designed a "dial" sight on the forend, and a raisable peep sight on the axis knuckle, whilst being ineffective on the Martini, it was not far out, and became standard issue on the Magazine Lee metford and Lee Enfield.
The adaptation was to knock the cotter pin holding the bayonet band out a touch, and using the sight bed and the pin end gave a natural trajectory whilst looking down the line of sight.
All these prototypes becme redundant with the adoption of Cordite, as the trajectory began to flatten out with the 800 fps increase in bullet speed it afforded.