The Ultra 400LA has a triple nosepiece (rather than quadruple), however it does have a 1.25NA condenser so by removing an objective and replacing it with a 100x objective the magnification could be increased to 1000x. Bear in mind that it can be fairly tricky to focus at 1000x without having first focused the microscope at 400x.
The F11-15 microscope has the same specification as the F11-10 except for an upgraded (1.25NA) condenser, it is equally as popular in schools as the F11-10 sharing the same rugged metal construction, metal focusing gear and student-proof locked-on components. The upgraded condenser makes it ideal for use with an optional 100x objective to achieve a magnification of 1000x. If working at a magnification of 100x we would advise purchasing the optional mechanical stage with this microscope. The EC.1001 and the EC.1051 microscopes share the same modern body shape, the EC.1051 adds a mechanical stage and re-chargeable batteries to the specification of the EC.1001. The BB.4200 and the BB.4220 microscopes are the big brothers of the EC.1001 and the EC.1051, they boast semi-plan lenses and re-chargeable batteries. The BB.4200 has a plain stage whereas the BB.4220 has an integral mechanical stage making it ideal for use with an optional 100x objective. The very attractive 18 and 28 Series microscopes share the same body design. The 28 Series have coaxial focusing (as opposed to the separate coarse and fine focusing of the 18 Series) and a rack and pinion condenser allowing for greater flexibility to achieve maximum resolution. The 2801 has a plain stage, the 1802 and 2802 benefit from having an integral mechanical stage and the option of either achromatic or superior semi-plan lenses. Please note semi-plan models are made to order with a minimum order quantity of six units. The high quality Swift120 is of superb build quality with an in-built handle (popular with technicians!) and re-chargeable batteries. It has superior achromatic objectives.