This model is illustrated in the 1890 BJA in an advertisement of Perken, Son & Rayment priced at 5/- and in the N&G catalogue priced at 10/6.

The lens is mounted in a tube which pulls out for use. The focusing collar determines how far the tube can be pulled out. There is no lock. The price was 4/-.

This is possibly the Compound Focuser by Lancaster illustrated in the 1892 BJA. The price was 2/6.

A foot indicates that this magnifier could be used as a view-finder. A ground glass diffuser was probably attached which is now missing. A similar magnifier is shown in the 1890 BJA from Perken, Son & Rayment priced at 4/-.

Sinclair made a series of focusing magnifiers all of similar design, each had a long tube enabling it to be used inside a focusing hood. The magnifier inverts and reverses the image, i.e. against a rear focusing screen the image will be seen correctly. The high magnification results in a lot of aberration and colour fringes, focusing on cross-hairs and an aerial image may be easier than a ground glass.

• 1925 Magnofoc, 12x magnification.
• 1926 High Power, 8x.
• 1929 High Power, 6x.
• 1932 High Power, 4x.

This model has a long tube to fit inside a focusing hood. When not in use the top half unscrews and is stored in the lower half. The price was 12/6. A similar model was sold by Sinclair as the Regent.

A similar model is shown in the 1926 BJA.

This replaces the conventional dark-cloth, one end slips over the focusing screen of the camera the other clips around the ears of the photographer. Made in sizes from quarter-plate to 10" x 12". Magnifiers could be fitted to the eye-pieces. Shown at the 1896 RPS exhibition.