Answer : The objectives fitted to the MSM 400 are custom-made for Singer Instruments, optimised for tetrad dissection with an ultra-long working distance. They are "Singer" Objectives.
Note: Singer Instruments are no longer able to supply the x 40 Objectives due to lack of availability but it may be possible to source them elsewhere.
If you would like replacements or extra objectives please find more details on our website shop : Objective Lenses
If you require more information please contact firstname.lastname@example.org for assistance.