Objective tubes are available either with fixed distance settings or with variable focus adjustment. The variable focus adjustment is realized by tube extension. Focusable objective tubes are used where discrete distances have to be focused or if the collimators, telescopes or autocollimators should be used at other wavelengths.
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.